JP2014174793A - Bus relay device, integrated circuit device, cable, connector, electronic apparatus, and bus relay method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bus relay device capable of performing communication having high reliability between a USB host and a USB device.SOLUTION: A bus relay device 200 includes an upstream port unit 210 to which a USB host 110 is connected and a downstream port unit 220 to which a USB device 120 is connected, and relays a packet or bus status between the upstream port unit 210 and the downstream port unit 220. When communication speed modes with the USB host 110 and the USB device 120 do not coincide with each other by negotiation, the bus relay device 200 performs control of the negotiation for connecting by the communication speed mode with the USB host 110 again after detaching the USB device 120.

Description

  The present invention relates to a bus relay device, an integrated circuit device, a cable, a connector, an electronic device, a bus relay method, and the like.

  Conventionally, the USB (Universal Serial Bus) standard is widely used as an interface standard for connecting a personal computer and peripheral devices. This USB standard prescribes the connection between one host and a plurality of devices. The personal computer has a host function defined in, for example, the USB standard, and the peripheral device has, for example, the USB standard. It has the function of the device specified in 1. Hereinafter, a device having a host function defined in the USB standard is referred to as a USB host, and a device having a device function defined in the USB standard is referred to as a USB device.

FIG. 16 shows a configuration example of a communication system including a general USB host and a USB device.
The communication system 10 includes a USB host 20 and a USB device 30, and the USB host 20 and the USB device 30 are connected via a bus 40 defined in the USB standard. Specifically, the USB host 20 has a downstream port unit 22, and one end of the bus 40 is connected to the downstream port unit 22. The USB device 30 has an upstream port unit 32, and the other end of the bus 40 is connected to the upstream port unit 32. Each of the downstream port unit 22 and the upstream port unit 32 includes, for example, a driver, a receiver, an NRZI (Non Return to Zero Inversion) decoder / encoder, a synchronization detection circuit, and a squelch detection circuit defined in the USB 2.0 standard. .

  In such a configuration, the USB host 20 and the USB device 30 perform communication defined by the USB standard through the bus 40 in half duplex. At this time, due to the characteristics of the other party, the communication environment, etc., the waveform of the signal from the USB host 20 is disturbed in the USB device 30 on the receiving side, or the waveform of the signal from the USB device 30 is on the receiving side. 20 may be disturbed. In FIG. 16, a state in which a signal is disturbed on the reception side is schematically shown by an eye pattern. In this case, a reception error occurs on the receiving side, and communication between the USB host 20 and the USB device 30 becomes impossible.

  As one method for solving this, it is conceivable to insert a USB hub having a hub function defined in the USB standard between the USB host 20 and the USB device 30. A technique related to such a USB hub is disclosed in Patent Document 1, for example.

JP 2011-186791 A

  However, when a USB hub as disclosed in, for example, Patent Document 1 is inserted between the USB host 20 and the USB device 30, the USB host 20 newly performs control for the USB hub defined in the USB standard. I need it. Therefore, there is a problem in that the number of components of a communication system using the USB host 20 and the USB device 30 is increased, the control is complicated, and the cost is increased due to these components.

  The present invention has been made in view of the above technical problems. According to some aspects of the present invention, a bus relay device, an integrated circuit device, a cable, a connector, and the like that enable communication between a USB host and a USB device with a simpler configuration without inserting a USB hub. An electronic device, a bus relay method, and the like can be provided.

  (1) One bus relay apparatus according to the present invention includes a first port unit to which a first USB device is connected, a second port unit to which a second USB device is connected, and the first port unit. Transfer is performed between the first port control unit that controls the port unit, the second port control unit that controls the second port unit, and the first port unit and the second port unit. A relay unit that relays a packet, and the other reproduces the bus status detected in one of the first port unit and the second port unit, and negotiates with the first USB device. When the first communication speed mode determined by the second USB communication apparatus does not match the second communication speed mode determined by negotiation with the second USB device, the second port control unit Detach 2 USB devices It was followed, and performs negotiation control for connecting to the second USB device in the first communication speed mode.

  According to this aspect, since the packet or bus status is relayed between the first USB device and the second USB device, the USB device having the host function can only see the existence of the USB device having the device function. Even if the bus relay apparatus according to the present invention is interposed, it is not necessary to control the bus relay apparatus, and communication can be performed with the same control as before. In the bus relay device according to the present invention, even when the communication speed mode that the first USB device and the second USB device can support is unknown, the first port unit side and the second port unit side The communication speed mode can be matched. Thereby, for example, the function of the transaction translator provided in the USB hub can be omitted, and communication between USB devices can be performed with a much simpler configuration as compared with the case of using the USB hub.

(2) In the above bus relay device, when the first communication speed mode and the second communication speed mode do not match, the first port control unit detaches the first USB device, It is preferable to perform negotiation control for connecting to the first USB device in the first communication speed mode after negotiation is performed by the second port control unit.
According to this aspect, since the first USB device is detached when the communication speed modes of the two do not match, in addition to the above effects, there are also problems such as inconvenience due to arrival of a packet from the first USB device. It can be avoided in advance.

  (3) One bus relay apparatus according to the present invention includes a first port unit to which a first USB device is connected, a second port unit to which a second USB device is connected, and the first port unit. Transfer is performed between the first port control unit that controls the port unit, the second port control unit that controls the second port unit, and the first port unit and the second port unit. A relay unit that relays packets, and the other port reproduces and transmits the bus status detected in one of the first port unit and the second port unit, and the first port control unit The first communication speed mode determined by negotiation with the first USB device is stored and the first USB device is detached, and the second port control unit and the second USB device are connected to the first USB device. Nego to connect in 1 communication speed mode After control of the negotiation, and performs control of the negotiation for the first port control unit is connected to the first USB device at the first communication speed mode.

  According to this aspect, since the packet or bus status is relayed between the first USB device and the second USB device, the USB device having the host function can only see the existence of the USB device having the device function. Even if the bus relay apparatus according to the present invention is interposed, it is not necessary to control the bus relay apparatus, and communication can be performed with the same control as before. In the bus relay device according to the present invention, even when the communication speed mode that the first USB device and the second USB device can support is unknown, the first port unit side and the second port unit side The communication speed mode can be matched. As a result, for example, the function of a transaction translator provided in the USB hub can be omitted, and communication between USB devices can be performed with a simpler configuration than in the case where a USB hub is interposed. In the bus relay device according to the present invention, since the first communication speed mode determined by the negotiation with the first USB device is stored, the negotiation with the second USB device is performed. Control of reconnection of the USB device is reduced, and efficient connection is possible.

(4) In the bus relay device, the relay unit transmits a signal corresponding to a packet relayed between the first port unit and the second port unit.
According to this aspect, even if the signal waveform is disturbed on the receiving side by transmitting a signal corresponding to the packet to be relayed, the USB device is connected between USB devices with a simpler configuration without inserting a USB hub. It is preferable that communication is possible.

  (5) In the above bus relay apparatus, the first port unit is an upstream port unit to which a USB host is connected, and the second port unit is a downstream port unit to which a USB device is connected. Preferably there is.

(6) In the above bus relay apparatus, the first port unit is a downstream port unit to which a USB device is connected, and the second port unit is an upstream port unit to which a USB host is connected. Preferably there is.
According to these aspects, by interposing the bus relay device according to the present invention, it is possible to prevent waveform disturbance on the receiving side, and more appropriate communication between USB devices becomes possible.

(7) One of the integrated circuit devices according to the present invention preferably includes the bus relay device and the USB host connected to the first port unit.
According to this aspect, by connecting the USB device to the bus relay device included in one of the integrated circuit devices according to the present invention, waveform disturbance on the receiving side can be prevented, and the integrated circuit device according to the present invention More appropriate communication is possible between the USB host and the USB device included in the.

(8) One of the integrated circuit devices according to the present invention preferably includes the bus relay device and the USB device connected to the second port unit.
According to this aspect, by connecting the USB host to the bus relay device included in one of the integrated circuit devices according to the present invention, waveform disturbance on the receiving side can be prevented, and the integrated circuit device according to the present invention More appropriate communication is possible between the USB device and the USB host included.

(9) The cable according to the present invention includes a first USB connector, a first bus to which the first USB connector is connected at one end, and the first port portion at the other end of the first bus. A bus relay device to which the second port unit is connected at one end, and a second USB connector connected to the other end of the second bus. Is preferred.
According to this aspect, by using the cable according to the present invention, waveform disturbance on the receiving side can be prevented, and more appropriate communication can be performed.

(10) The connector according to the present invention preferably includes a USB connector and the above-described bus relay device to which the first port unit or the second port unit is connected to the USB connector.
According to this aspect, by using the connector according to the present invention, waveform disturbance on the receiving side can be prevented, and more appropriate communication can be performed.

(11) An electronic device according to the present invention includes the bus relay device described above.
According to this aspect, by using the electronic apparatus according to the present invention, waveform disturbance on the receiving side can be prevented, and more appropriate communication can be performed.

  (12) One of the bus relay methods according to the present invention is a bus relay method performed between an up port unit to which a first USB device is connected and a down port unit to which a second USB device is connected. Determined in the first connection step in which negotiation is performed with the first USB device, in the second connection step in which negotiation is performed with the second USB device, and in the first connection step. A first disconnecting step of detaching the second USB device when the first communication speed mode and the second communication speed mode determined in the second connection step do not match; After the disconnection step, after the third connection step, a third connection step for performing negotiation for connection with the second USB device in the first communication speed mode, and after the third connection step , Characterized in that it comprises a relay step of relaying the packet or a bus status between said first port portion and the second port portion.

  (13) In one of the above bus relay methods, a second disconnecting step of detaching the first USB device when the first communication speed mode and the second communication speed mode do not match, After the second disconnecting step and the third connecting step, a fourth connecting step for performing a negotiation for connecting to the first USB device in the first communication speed mode, and the relaying step, It is preferable that the packet or bus status is relayed between the first port unit and the second port unit after the fourth connection step.

  (14) One of the bus relay methods according to the present invention is a bus relay method performed between an up port unit to which a first USB device is connected and a down port unit to which a second USB device is connected. A first connection step of negotiating with the first USB device and storing the determined first communication speed mode; and after the first connection step, the first USB device. A second connection for performing a negotiation for connection in the first communication speed mode stored in the first connection step between the first disconnecting step of detaching the terminal and the second USB device And, after the second connection step, a third connection step for performing a negotiation for connection with the first USB device in the first communication speed mode, and the third connection step. After the connection step, characterized in that it comprises a relay step of relaying the packet or a bus status between said first port portion and the second port portion.

  (15) In the above bus relay method, the relay step reproduces and transmits the bus status detected in one of the first port unit and the second port unit on the other side, and It is preferable to transmit a signal corresponding to a packet relayed between the port unit and the second port unit.

  (16) In the above bus relay method, the first port unit is an upstream port unit to which a USB host is connected, and the second port unit is a downstream port unit to which a USB device is connected. Preferably there is.

  (17) In the above bus relay method, the first port unit is a downstream port unit to which a USB device is connected, and the second port unit is an upstream port unit to which a USB host is connected. is there.

  According to any one of the above bus relay methods, it is possible to prevent the waveform distortion of the signal on the receiving side in communication between devices.

The figure which shows the structural example of the communication system in 1st Embodiment. The block diagram of the structural example of the bus relay apparatus of FIG. The flowchart of the example of control of the bus relay apparatus in 1st Embodiment. The figure which shows an example of the operation | movement sequence of the bus relay apparatus in 1st Embodiment. The flowchart of the example of control of the bus relay apparatus in 2nd Embodiment. The figure which shows an example of the operation | movement sequence of the bus relay apparatus in 2nd Embodiment. The flowchart of the example of control of the bus relay apparatus in 3rd Embodiment. The figure which shows an example of the operation | movement sequence of the bus relay apparatus in 3rd Embodiment. The block diagram of the 1st structural example of the integrated circuit device to which the bus relay apparatus in any one of 1st Embodiment-3rd Embodiment was applied. The block diagram of the 2nd structural example of the integrated circuit device to which the bus relay apparatus in any one of 1st Embodiment-3rd Embodiment was applied. The figure which shows the structural example of the communication system in the 1st modification of any one of said embodiment. The figure which shows the structural example of the communication system in the 2nd modification of one of said embodiment. The block diagram of the structural example of the USB cable to which the bus relay apparatus in any one of said embodiment or its modification was applied. The block diagram of the structural example of the connector to which the bus relay apparatus in any one of said embodiment or its modification was applied. FIGS. 15A and 15B are block diagrams of configuration examples of electronic devices to which the bus relay device according to any one of the above-described embodiments or modifications thereof is applied. The figure which shows the structural example of the communication system comprised by a general USB host and a USB device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily indispensable configuration requirements for solving the problems of the present invention.

In the following, the first port unit according to the present invention is an upstream port unit, the second port unit according to the present invention is a downstream port unit, the first USB device according to the present invention is a USB host, and the present invention The second USB device will be described as a USB device. In this case, an upstream port control unit described later corresponds to the first port control unit, and a downstream port control unit described later corresponds to the second port control unit.
In the following, for convenience of explanation, the USB 2.0 standard is adopted as the USB standard, and the communication speed mode of the USB host and the USB device compliant with the USB 2.0 standard is HS (High Speed) mode or FS (Full Speed). ) Mode.

[Bus relay device]
1. First Embodiment FIG. 1 shows a configuration example of a communication system in a first embodiment according to the present invention.
The communication system 100 according to the first embodiment includes a USB host 110, a USB device 120, and a bus relay device 200. The bus relay device 200 is provided between the USB host 110 and the USB device 120. Have. The USB host 110 and the bus relay apparatus 200 are connected via a USB bus (hereinafter referred to as a bus) 130 defined in the USB standard, and the bus relay apparatus 200 and the USB device 120 are connected to a bus 132 defined in the USB standard. Connected through.

The USB host 110 has a downstream port unit 112, and the USB device 120 has an upstream port unit 122. Each of the buses 130 and 132 includes two power supply lines VBUS and GND, and two signal lines DP (D +) and DM (D−) which are differential buses.
One end of the bus 130 is connected to the downstream port unit 112, and the other end is connected to the bus relay device 200. The USB host 110 and the bus relay apparatus 200 perform communication defined in the USB standard via the bus 130. One end of the bus 132 is connected to the bus relay device 200, and the other end is connected to the upstream port unit 122. The USB device 120 and the bus relay apparatus 200 perform communication defined by the USB standard via the bus 132.

  The bus relay apparatus 200 performs speed negotiation with each other so that the communication speed mode with the USB host 110 and the communication speed mode with the USB device 120 are the same, and relays the packet or bus status between them. Act as a repeater.

Specifically, the bus relay apparatus 200 includes an upstream port unit to which the USB host 110 is connected via the bus 130 and a downstream port unit to which the USB device 120 is connected via the bus 132. . The bus relay apparatus 200 reproduces and transmits the bus status (reset, suspend, resume, disconnect) detected on the upstream port unit side on the downstream port unit side. Further, the bus relay apparatus 200 relays the packet from the USB host 110 received on the upstream port unit side to the downstream port unit side and transfers the packet to the USB device 120.
Similarly, the bus relay apparatus 200 reproduces and transmits the bus status (resume, disconnection) detected on the downstream port unit side on the upstream port unit side. Further, the bus relay apparatus 200 relays the packet from the USB device 120 received on the downstream port unit side to the upstream port unit side and transfers the packet to the USB host 110.

  According to the first embodiment, since the waveform of the signal corresponding to the packet or the bus status can be shaped between the USB host 110 and the USB device 120 by the bus relay device 200, the waveform of the signal on the receiving side is It will not be disturbed (Fig. 1). Further, when performing the control, the USB host 110 can only see the existence of the USB device 120 instead of the USB hub, and therefore, the USB host 110 only needs to control the USB device 120 as before. Further, since the speed negotiation is performed so that the communication speed modes between the USB host 110 and the USB device 120 are the same, the bus relay apparatus 200 can omit the function of the transaction translator provided in the USB hub. . As a result, even if the signal waveform is disturbed on the receiving side, communication between the USB host and the USB device can be performed with a simpler configuration without inserting a USB hub.

FIG. 2 shows a block diagram of a configuration example of the bus relay apparatus 200 of FIG.
The bus relay apparatus 200 includes an upstream port unit 210, a downstream port unit 220, an upstream port control unit 230, a downstream port control unit 240, and a relay unit 250.
The upstream port control unit 230 includes an attach processing unit 232, a detach processing unit 234, a speed negotiation processing unit 236, and a bus status processing unit 238.
The downstream port control unit 240 includes an attach processing unit 242, a detach processing unit 244, a speed negotiation processing unit 246, and a bus status processing unit 248.
The relay unit 250 includes sampling units 252 and 262 and elasticity buffers 254 and 264.

The USB host 110 is connected to the upstream port unit 210 via the bus 130. The USB device 120 is connected to the downstream port unit 220 via the bus 132.
Each of the upstream port unit 210 and the downstream port unit 220 includes a driver, a receiver, an NRZI decoder / encoder, a synchronization detection circuit, and a squelch detection circuit. Since such a driver is defined in the USB 2.0 standard, illustration thereof is omitted.
The driver includes an HS driver that is used when the HS mode is selected, and an FS driver that is used when the FS mode or the LS mode is selected.
The receiver includes an HS receiver that is used when the HS mode is selected, an FS receiver that is used when the FS mode or the LS mode is selected, and other various receivers defined in the USB 2.0 standard.
The NRZI decoder / encoder converts an NRZ code signal inside the bus relay apparatus 200 into an NRZI code signal, and converts an NRZI code signal transferred via the bus into an NRZ code signal.
The synchronization detection circuit detects a change in the received signal and detects synchronization of the received signal.
The squelch detection circuit detects whether valid data (packets) is transferred or whether valid data (packets) are not transferred.

The upstream port control unit 230 controls the upstream port unit 210 and also controls relay processing in the relay unit 250.
The attach processing unit 232 performs control such as attaching the USB host 110 to the upstream port unit 210 and monitoring the attachment. The attachment of the USB host 110 is realized by performing pull-up (FS termination) of the signal line DP as an attach process by the attach processing unit 232 in a state where power is supplied to the VBUS by the USB host 110.
The detach processing unit 234 performs control such as detachment of the USB host 110 connected to the upstream port unit 210 and detection of detachment. Detach the USB host 110 when HS mode is off, HS termination (FS driver outputs SE0 (DP = DM = L), HS driver and HS receiver are on), FS termination is off It is realized by doing.
The speed negotiation processing unit 236 controls the speed negotiation with the USB host 110 by controlling the upstream port unit 210.
The bus status processing unit 238 detects the bus status detected in the upstream port unit 210 or transmits the designated bus status by controlling the upstream port unit 210.

The downstream port control unit 240 controls the downstream port unit 220 and controls relay processing in the relay unit 250.
Specifically, the attach processing unit 242 performs control such as attaching the USB device 120 to the downstream port unit 220 and monitoring the attachment. The attachment of the USB device 120 is realized by, for example, the FS termination performed by the USB device 120 in a state where the attachment processing unit 242 supplies power to the VBUS.
The detach processing unit 244 performs control such as detachment of the USB device 120 connected to the downstream port unit 220 and detection of detachment. Detachment of the USB device 120 is realized by stopping power supply to the VBUS by the detach processing unit 244.
The speed negotiation processing unit 246 controls the speed negotiation with the USB device 120 by controlling the downstream port unit 220.
The bus status processing unit 248 detects the bus status detected in the downstream port unit 220 and transmits the designated bus status by controlling the downstream port unit 220.

The upstream port control unit 230 and the downstream port control unit 240 perform transmission and reception of messages for performing a cooperative operation with each other.
Upon receiving the message from the downstream port control unit 240, the upstream port control unit 230 relays the bus status detected by the downstream port unit 220 to the upstream port unit 220.
Conversely, the downstream port control unit 240 relays the bus status detected by the upstream port unit 210 to the downstream port unit 220 by receiving a message from the upstream port control unit 230.

The relay unit 250 samples a signal corresponding to the packet received by the upstream port unit 210, buffers the sampled signal, and outputs the sampled signal to the downstream port unit 220.
Specifically, the sampling unit 252 samples a signal corresponding to the packet received at the upstream port unit 210. The elasticity buffer 254 outputs the sampled signal while absorbing the frequency difference between the input side and the output side.

The relay unit 250 samples a signal corresponding to the packet received by the downstream port unit 220, buffers the sampled signal, and outputs the sampled signal to the upstream port unit 210.
Specifically, the sampling unit 262 samples a signal corresponding to the packet received at the downstream port unit 220. The elasticity buffer 264 outputs the sampled signal while absorbing the frequency difference between the input side and the output side.

Next, an operation example of the bus relay device 200 in the first embodiment will be described.
FIG. 3 shows a flowchart of a control example of the bus relay apparatus 200 in the first embodiment. Each part of the bus relay apparatus 200 shown in FIG. 2 performs control according to the flow shown in FIG.
First, the downstream port control unit 240 monitors the attachment of the USB device 120 to the downstream port unit 220 in the attach processing unit 242 (step S1: N).
When the attachment of the USB device 120 is detected (step S1: Y), the downstream port control unit 240 performs speed negotiation with the USB device 120 in the speed negotiation processing unit 246 (step S2). Step S2 corresponds to a second connection step according to the first embodiment. As a result, a communication speed mode (second communication speed mode) between the bus relay apparatus 200 and the USB device 120 is determined.

Subsequently, the upstream port control unit 230 monitors the power supply of VBUS by the USB host 110 in the upstream port unit 210 in the attach processing unit 232 (step S3: N).
When power supply of VBUS is detected (step S3: Y), the upstream port control unit 230 performs speed negotiation with the USB host 110 in the speed negotiation processing unit 236 (step S4). Step S4 corresponds to the first connection step according to the first embodiment. As a result, a communication speed mode (first communication speed mode) between the bus relay apparatus 200 and the USB host 110 is determined. When the second communication speed mode is FS, the first communication speed mode is also determined as FS.

Next, the bus relay apparatus 200 compares the communication speed mode determined in step S2 with the communication speed mode determined in step S4 (step S5).
When the two match (step S5: Y), the USB device 120 and the USB host 110 are connected in the HS mode or the FS mode. Therefore, the bus relay device 200 relays the packet or bus status (step S6). That is, in step S <b> 6, the relay unit 250 relays a packet transferred between the upstream port unit 210 and the downstream port unit 220. Also, the bus status processing unit 238 detects the bus status detected in the upstream port unit 210, and the bus status processing unit 248 controls the downstream port unit 220 to reproduce and transmit the detected bus status. . Alternatively, the bus status processing unit 248 detects the bus status detected in the downstream port unit 220, and the bus status processing unit 238 controls the upstream port unit 210 to reproduce and set the detected bus status. . Step S6 corresponds to a relay step according to the first embodiment.

  When the two do not match in step S5 (step S5: N), the downstream port control unit 240 detaches the USB device 120 in the detach processing unit 244 (step S7). Step S7 corresponds to the first cutting step according to the first embodiment.

Thereafter, the downstream port control unit 240 controls the speed negotiation for connecting to the USB device 120 in the communication speed mode determined with the USB host 110 in the speed negotiation processing unit 246 (step S8). Step S8 corresponds to a third connection step according to the first embodiment.
As a result, the bus relay apparatus 200 enters a state in which the communication speed mode matches between each of the USB host 110 and the USB device 120, and relays the packet or the bus status (step S6).

  Thereafter, when the series of processing is not finished (step S9: N), the process returns to step S6, and the bus relay device 200 continues to relay the packet or the bus status. On the other hand, when the process ends in step S9 (step S9: Y), the bus relay apparatus 200 ends a series of processes (end).

FIG. 4 shows an example of an operation sequence of the bus relay apparatus 200 in the first embodiment. FIG. 4 shows an example of a sequence when the USB host 110 can communicate in the FS mode and the USB device 120 can communicate in the HS mode.
First, it is assumed that the USB host 110 is connected to the upstream port unit 210 and power is supplied to the VBUS (SQ1). At this time, the attach processing unit 232 does not perform the attach process, and the upstream port unit 210 remains in the Detached state. The attach processing unit 232 does not turn on the FS termination until the USB device 120 is connected to the downstream port unit 220.

  Thereafter, the downstream port control unit 240 detects the attachment of the USB device 120 in the downstream port unit 220 in the initial state in the attach processing unit 242 (SQ2). The attach processing unit 242 detects the attachment of the USB device 120 by detecting the pull-up of the signal line DP in a state where power is supplied to the VBUS.

Subsequently, the downstream port control unit 240 controls the speed negotiation with the USB device 120 in the speed negotiation processing unit 246 (SQ3).
Specifically, the speed negotiation processing unit 246 causes the bus status processing unit 248 to control the downstream port unit 220 and issues a bus reset. The bus reset is performed by setting the signal line DP to the L level and the signal line DM to the L level.
The USB device 120 that has detected the bus reset indicates to the bus relay device 200 that communication in the HS mode is possible (HS Capable). This assertion is realized by Chirp that drives the data K (DP = L, DM = L) with the FS termination turned on.
In response to this assertion, the speed negotiation processing unit 246 controls the downstream port unit 220 to permit connection (HS Granted) in the HS mode, and the HS mode is selected. The connection permission in the HS mode is performed by alternately driving data K and data J (DP = H, DP = L) (returning Chirp) on the signal lines DP and DM. When the HS mode is selected, the FS termination is turned off and the HS termination is turned on.

  As a result, the downstream port unit 220 enters the HS_Ready state, and the downstream port control unit 240 transmits a message DP_Ready (HS) to the upstream port control unit 230 (SQ4).

  Upon receiving the message DP_Ready (HS), the upstream port control unit 230 controls the upstream port unit 210 that is in the Attach state, and the attach processing unit 232 performs an attach process (FS termination is turned on) (SQ5).

Thereafter, the upstream port unit 210 enters a reset state, and the upstream port control unit 230 controls the speed negotiation with the USB host 110 in the speed negotiation processing unit 236 (SQ6).
Specifically, when the USB host 110 issues a bus reset, the speed negotiation processing unit 236 controls the upstream port unit 210 to indicate to the USB host 110 that communication in the HS mode is possible ( HS Capable).
In response to this assertion, the USB host 110 permits connection in the FS mode (FS Granted), and the FS mode is selected. The connection permission in the FS mode is realized by not returning Chirp within a predetermined period. When the FS mode is selected, the FS termination is turned on and the HS termination is turned off.

  As a result, since the HS mode is established with the USB device 120 and the FS mode is established with the USB host 110, the upstream port unit 210 is in the Wait state. Therefore, the upstream port control unit 230 transmits a message UP_Ready (FS) to the downstream port control unit 240 (SQ7).

  When the message UP_Ready (FS) is received from the upstream port control unit 230, the downstream port unit 220 enters a ReConnect state. In the detach processing unit 244, the downstream port control unit 240 controls the downstream port unit 220 to detach the USB device 120 (SQ8).

Thereafter, the downstream port control unit 240 uses the speed negotiation processing unit 246 to reconnect the USB device 120 in the FS mode.
Specifically, the attach processing unit 242 supplies power to the VBUS and releases the detach (SQ9). The USB device 120 that has detected the power supply to the VBUS attaches by turning on the FS termination (SQ10).

Then, the speed negotiation processing unit 246 controls the speed negotiation for connecting to the USB device 120 in the FS mode (SQ11).
Specifically, the speed negotiation processing unit 246 causes the bus status processing unit 248 to control the downstream port unit 220 and issues a bus reset.
The USB device 120 that has detected the bus reset indicates to the bus relay device 200 that communication in the HS mode is possible (HS Capable).
In response to this assertion, the speed negotiation processing unit 246 controls the downstream port unit 220 to permit connection in the FS mode (FS Granted), and the FS mode is selected.

  As a result, the downstream port unit 220 enters the FS_Ready state, and the downstream port control unit 240 transmits a message DP_Ready (FS) to the upstream port control unit 230 (SQ12).

  Thereafter, each of the upstream port unit 210 and the downstream port unit 220 is in a relay state, and the bus relay apparatus 200 is in a state in which it can communicate with each of the USB host 110 and the USB device 120 in the FS mode. Become. Then, the bus relay apparatus 200 relays the packet or bus status between the USB host 110 and the USB device 120 (SQ13).

  In SQ6, when the HS mode is established with the USB device 120 and the HS mode is established with the USB host 110, the sequence shifts to SQ13 after transmitting the message UP_Ready (HS).

  As described above, according to the first embodiment, a signal transferred between the USB host 110 and the USB device 120 by the bus relay device 200 inserted between the USB host 110 and the USB device 120. Can be shaped. At this time, the bus relay apparatus 200 reproduces the packet or bus status detected on one side of the upstream port unit side and the downstream port unit side on the other side. In this way, when performing the control, the USB host 110 can only see the existence of the USB device 120 instead of the USB hub, and therefore the USB host 110 only needs to control the USB device 120 as before. As a result, even when the waveform of the signal is disturbed, communication between the USB host and the USB device can be performed with a simpler configuration without inserting a USB hub.

  In addition, the bus relay apparatus 200 can detect the upstream port unit side and the downstream port unit side even when the communication speed mode that the USB host 110 can support and the communication speed mode that the USB device 120 can support are unknown. Match the communication speed mode. As a result, the function of the transaction translator included in the USB hub can be omitted, and communication between the USB host and the USB device can be performed with a simpler configuration.

  Furthermore, the bus relay apparatus 200 performs speed negotiation with the USB host 110 after performing speed negotiation with the USB device 120. Thereby, the packet and bus status from the USB host 110 can be reliably relayed to the USB device 120.

2. Second Embodiment In the first embodiment, when the two communication speed modes do not match, the bus relay device 200 again detaches (disconnects) the USB device 120 and then again so that the communication speed modes match. Perform speed negotiation. On the other hand, in the second embodiment, when the two do not match, after the USB host 110 and the USB device 120 are detached, the speed negotiation is performed again for both so that the communication speed modes match.

  Since the configuration of the bus relay apparatus in the second embodiment is the same as the configuration of the bus relay apparatus 200 in the first embodiment, illustration and description thereof are omitted. For convenience of explanation, an operation example of the bus relay apparatus according to the second embodiment will be described below using the reference numerals of the respective parts constituting the bus relay apparatus 200 shown in FIG.

FIG. 5 shows a flowchart of a control example of the bus relay apparatus 200 in the second embodiment. Each part of the bus relay apparatus 200 shown in FIG. 2 performs control according to the flow shown in FIG.
First, the downstream port control unit 240 monitors the attachment of the USB device 120 to the downstream port unit 220 in the attach processing unit 242 (step S11: N).
When the attachment of the USB device 120 is detected (step S11: Y), the downstream port control unit 240 performs speed negotiation with the USB device 120 in the speed negotiation processing unit 246 (step S12). Step S12 corresponds to a second connection step according to the second embodiment. As a result, a communication speed mode (second communication speed mode) between the bus relay apparatus 200 and the USB device 120 is determined.

Subsequently, the upstream port control unit 230 monitors the power supply of VBUS by the USB host 110 in the upstream port unit 210 in the attach processing unit 232 (step S13: N).
When power supply of VBUS is detected (step S13: Y), the upstream port control unit 230 performs speed negotiation with the USB host 110 in the speed negotiation processing unit 236 (step S14). Step S14 corresponds to the first connection step according to the second embodiment. As a result, a communication speed mode (first communication speed mode) between the bus relay apparatus 200 and the USB host 110 is determined.

Next, the bus relay apparatus 200 compares the communication speed mode determined in step S2 with the communication speed mode determined in step S4 (step S15).
When the two match (step S15: Y), the USB device 120 and the USB host 110 are connected in the HS mode or the FS mode. Therefore, the bus relay device 200 relays the packet or bus status (step S16). Step S16 corresponds to a relay step according to the second embodiment.

When the two do not match in step S15 (step S15: N), the upstream port control unit 230 detaches the USB host 110 (step S17). In step S <b> 17, the upstream port control unit 230 detaches the USB host 110 in the detach processing unit 234. Step S17 corresponds to a second cutting step according to the second embodiment.
Subsequently, the downstream port control unit 240 detaches the USB device 120 (step S18). In step S <b> 18, the downstream port control unit 240 detaches the USB device 120 in the detach processing unit 244. Step S18 corresponds to the first cutting step according to the second embodiment.

Thereafter, the downstream port control unit 240 controls the speed negotiation with the USB device 120 in the speed negotiation processing unit 246 (step S19). Step S19 corresponds to a third connection step according to the second embodiment.
Subsequently, the upstream port control unit 230 controls the speed negotiation with the USB host 110 in the speed negotiation processing unit 236 (step S20). Step S20 corresponds to a fourth connection step according to the second embodiment.
In step S19 and step S20, speed negotiation is performed for connection in the low-speed communication speed mode among the communication speed modes determined in step S12 and step S14. As a result, the bus relay apparatus 200 enters a state in which the communication speed mode matches between each of the USB host 110 and the USB device 120, and relays the packet or the bus status (step S16).

  Thereafter, when the series of processing is not finished (step S21: N), the process returns to step S16, and the bus relay apparatus 200 continues to relay the packet or the bus status. On the other hand, when the process ends in step S21 (step S21: Y), the bus relay apparatus 200 ends a series of processes (end).

FIG. 6 shows an example of an operation sequence of the bus relay apparatus 200 in the second embodiment. FIG. 6 shows an example of a sequence when the USB host 110 can communicate in the FS mode and the USB device 120 can communicate in the HS mode.
First, it is assumed that the USB host 110 is connected to the upstream port unit 210 and power is supplied to the VBUS (SQ21). At this time, the attach processing unit 232 does not perform the attach process, and the upstream port unit 210 remains in the Detached state.

  Thereafter, the downstream port control unit 240 detects the attachment of the USB device 120 in the downstream port unit 220 in the initial state in the attach processing unit 242 (SQ22).

Subsequently, in the downstream port control unit 240, the speed negotiation processing unit 246 controls speed negotiation with the USB device 120 (SQ23).
Specifically, the speed negotiation processing unit 246 causes the bus status processing unit 248 to control the downstream port unit 220 and issues a bus reset.
The USB device 120 that has detected the bus reset indicates to the bus relay device 200 that communication in the HS mode is possible (HS Capable).
In response to this assertion, the speed negotiation processing unit 246 controls the downstream port unit 220 to permit connection (HS Granted) in the HS mode, and the HS mode is selected.

  As a result, the downstream port unit 220 enters the HS_Ready state, and the downstream port control unit 240 transmits a message DP_Ready (HS) to the upstream port control unit 230 (SQ24).

  Receiving the message DP_Ready (HS), the upstream port control unit 230 controls the upstream port unit 210 that is in the Attach state, and the attach processing unit 232 performs attach processing (SQ25).

Thereafter, the upstream port unit 210 enters a reset state, and the upstream port control unit 230 controls the speed negotiation with the USB host 110 in the speed negotiation processing unit 236 (SQ26).
Specifically, when the USB host 110 issues a bus reset, the speed negotiation processing unit 236 controls the upstream port unit 210 to indicate to the USB host 110 that communication in the HS mode is possible ( HS Capable).
In response to this assertion, the USB host 110 permits connection in the FS mode (FS Granted), and the FS mode is selected.

  As a result, since the HS mode is established with the USB device 120 and the FS mode is established with the USB host 110, the upstream port unit 210 is in the Wait state. Therefore, the upstream port control unit 230 transmits a message UP_Ready (FS) to the downstream port control unit 240 (SQ27).

  At this time, since the packet arrives at the bus relay apparatus 200 from the USB host 110, the upstream port control unit 230 detaches the USB host 110 at the detach processing unit 234 (SQ28). As a result, the upstream port unit 210 enters the Detached state.

  When the message UP_Ready (FS) is received from the upstream port control unit 230, the downstream port unit 220 enters a ReConnect state. In the detach processing unit 244, the downstream port control unit 240 controls the downstream port unit 220 to detach the USB device 120 (SQ29).

Thereafter, the downstream port control unit 240 uses the speed negotiation processing unit 246 to reconnect the USB device 120 in the FS mode.
Specifically, the attach processing unit 242 supplies power to the VBUS and releases the detach (SQ30). The USB device 120 that has detected the supply of power to the VBUS attaches by turning on the FS termination (SQ31).

Then, the speed negotiation processing unit 246 controls the speed negotiation for connecting with the USB device 120 in the FS mode (SQ32).
Specifically, the speed negotiation processing unit 246 causes the bus status processing unit 248 to control the downstream port unit 220 and issues a bus reset.
The USB device 120 that has detected the bus reset indicates to the bus relay device 200 that communication in the HS mode is possible (HS Capable).
In response to this assertion, the speed negotiation processing unit 246 controls the downstream port unit 220 to permit connection in the FS mode (FS Granted), and the FS mode is selected.

  As a result, the downstream port unit 220 enters the FS_Ready state, and the downstream port control unit 240 transmits a message DP_Ready (FS) to the upstream port control unit 230 (SQ33).

When the message DP_Ready (FS) is received, the upstream port unit 210 enters the Attach state. The upstream port control unit 230 controls the speed negotiation for connecting to the USB host 110 in the FS mode in the speed negotiation processing unit 236 (SQ34).
Specifically, when the USB host 110 issues a bus reset, the speed negotiation processing unit 236 controls the upstream port unit 210 to indicate to the USB host 110 that communication in the FS mode is possible ( not HS Capable). This assertion is realized by not performing Chirp within a predetermined period.
In response to this assertion, the USB host 110 permits connection in the FS mode (FS Granted), and the FS mode is selected.

  As a result, the upstream port unit 210 enters the relay state, and the upstream port control unit 230 transmits a message UP_Ready (FS) to the downstream port control unit 240 (SQ35).

  Then, the downstream port unit 220 is also in a relay state, and the bus relay device 200 is in a state in which communication with each of the USB host 110 and the USB device 120 is possible in the FS mode. Then, the bus relay device 200 relays the packet or bus status between the USB host 110 and the USB device 120 (SQ36).

  In SQ26, when the HS mode is established with the USB device 120 and the HS mode is established with the USB host 110, the sequence proceeds to SQ35 and SQ36 as they are.

  As described above, according to the second embodiment, the same effect as that of the first embodiment can be obtained. In the second embodiment, inconvenience due to arrival of a packet from the USB host 110 connected by the SQ 26 can be avoided in advance.

3. Third Embodiment In the first embodiment or the second embodiment, the bus relay device 200 performs detachment and speed negotiation again when the communication speed modes of the USB host 110 and the USB device 120 do not match. . On the other hand, in the third embodiment, for example, after acquiring a communication speed mode that can be supported by the USB host, the speed is again set so that the communication speed modes of the USB host 110 and the USB device 120 match. Negotiate.

  Since the configuration of the bus relay apparatus in the third embodiment is the same as the configuration of the bus relay apparatus 200 in the first embodiment, illustration and description thereof are omitted. For convenience of explanation, an example of the operation of the bus relay device according to the third embodiment will be described below using the reference numerals of the components constituting the bus relay device 200 shown in FIG.

FIG. 7 shows a flowchart of a control example of the bus relay apparatus 200 in the third embodiment. Each part of the bus relay apparatus 200 shown in FIG. 2 performs control according to the flow shown in FIG.
First, the upstream port control unit 230 monitors the attachment of the USB host 110 to the upstream port unit 210 in the attach processing unit 232 (step S31: N).
When the attachment of the USB host 110 is detected (step S31: Y), the upstream port control unit 230 performs speed negotiation with the USB host 110 in the speed negotiation processing unit 236 (step S32). Thereafter, the upstream port control unit 230 stores the communication speed mode with the USB host 110 determined by the speed negotiation (step S33). Step S32 and step S33 correspond to a first connection step according to the third embodiment.

  Subsequently, the upstream port control unit 230 detaches the USB host 110 in the detach processing unit 234 (step S34). Step S34 corresponds to the first cutting step according to the third embodiment.

Next, the downstream port control unit 240 monitors the attachment of the USB device 120 in the downstream port unit 220 in the attach processing unit 242 (step S35: N).
When the attachment of the USB device 120 is detected (step S35: Y), the upstream port control unit 230 performs speed negotiation with the USB device 120 in the speed negotiation processing unit 236 (step S36). At this time, the speed negotiation processing unit 236 performs speed negotiation for connecting to the USB device 120 in the communication speed mode stored in step S33. Step S36 corresponds to a second connection step according to the third embodiment.

  Subsequently, the upstream port control unit 230 performs speed negotiation again with the USB host 110 in the speed negotiation processing unit 236 (step S37). Step S37 corresponds to a third connection step according to the third embodiment.

  As a result, the USB device 120 and the USB host 110 are connected in the HS mode or the FS mode. Therefore, the bus relay apparatus 200 relays the packet or bus status (step S38). Step S38 corresponds to the relay step according to the third embodiment.

  Thereafter, when the series of processing is not finished (step S39: N), the process returns to step S38, and the bus relay apparatus 200 continues to relay the packet or the bus status. On the other hand, when the process ends in step S39 (step S39: Y), the bus relay apparatus 200 ends a series of processes (end).

FIG. 8 shows an example of an operation sequence of the bus relay device 200 according to the third embodiment. FIG. 8 shows an example of a sequence when the USB host 110 and the USB device 120 can communicate in the HS mode.
First, it is assumed that the USB host 110 is connected to the upstream port unit 210 and power is supplied to the VBUS (SQ41). At this time, the upstream port unit 210 is in the PreAttach state.

Next, the upstream port control unit 230 attaches the USB host 110 in the attach processing unit 232 (SQ42).
Then, the upstream port control unit 230 performs speed negotiation (pre-negotiation) with the USB host 110 in the speed negotiation processing unit 236 (SQ43).
Specifically, when the USB host 110 issues a bus reset, the speed negotiation processing unit 236 controls the upstream port unit 210 to indicate to the USB host 110 that communication in the HS mode is possible ( HS Capable).
In response to this assertion, the USB host 110 permits connection in the HS mode (HS Granted).
At this time, the upstream port control unit 230 stores the communication speed mode determined by speed negotiation with the USB host 110. Here, the HS mode is determined by speed negotiation with the USB host 110.

  Subsequently, the upstream port control unit 230 detaches the USB host 110 in the detach processing unit 234 (SQ44), and the upstream port unit 210 enters the Detached state.

  The upstream port control unit 230 transmits a message mode (HS) to the downstream port control unit 240 (SQ45). Here, the message Mode (HS) notifies that the communication speed mode determined with the USB host 110 is the HS mode.

When receiving the message Mode (HS), the downstream port unit 220 changes from the initial state to the attach state. Therefore, the downstream port control unit 240 supplies power to the VBUS in the attach processing unit 242, and monitors the attachment of the USB device 120 (SQ46).
Thereafter, the attach processing unit 242 detects the attachment of the USB device 120 in the downstream port unit 220 (SQ47).

Subsequently, the downstream port control unit 240 controls the speed negotiation with the USB device 120 by the speed negotiation processing unit 246 (SQ48). At this time, the speed negotiation processing unit 246 controls the speed negotiation with the USB device 120 so as to be connected in the HS mode communicated by the message mode (HS).
Specifically, the speed negotiation processing unit 246 causes the bus status processing unit 248 to control the downstream port unit 220 and issues a bus reset.
The USB device 120 that has detected the bus reset indicates to the bus relay device 200 that communication in the HS mode is possible (HS Capable).
In response to this assertion, the speed negotiation processing unit 246 controls the downstream port unit 220 to permit connection (HS Granted) in the HS mode, and the HS mode is selected.

  As a result, the downstream port unit 220 enters the HS_Ready state, and the downstream port control unit 240 transmits a message DP_Ready (HS) to the upstream port control unit 230 (SQ49).

  Receiving the message DP_Ready (HS), the upstream port control unit 230 controls the upstream port unit 210 that is in the Attach state, and the attach processing unit 232 performs the attach process (SQ50).

Thereafter, the upstream port unit 210 enters a reset state, and the upstream port control unit 230 controls the speed negotiation with the USB host 110 in the speed negotiation processing unit 236 (SQ51).
Specifically, when the USB host 110 issues a bus reset, the speed negotiation processing unit 236 controls the upstream port unit 210 to indicate to the USB host 110 that communication in the HS mode is possible ( HS Capable).
In response to this assertion, the USB host 110 permits connection in the HS mode (HS Granted), and the HS mode is selected.

  As a result, the upstream port unit 210 enters the relay state, and the upstream port control unit 230 transmits a message UP_Ready (HS) to the downstream port control unit 240 (SQ52).

  Then, the downstream port unit 220 is also in a relay state, and the bus relay device 200 is in a state in which communication with each of the USB host 110 and the USB device 120 is possible in the HS mode. Then, the bus relay device 200 relays the packet or bus status between the USB host 110 and the USB device 120 (SQ53).

  As described above, according to the third embodiment, the same effect as that of the first embodiment can be obtained. Furthermore, according to the third embodiment, since the communication speed mode that can be supported by the USB host 110 is stored by pre-negotiation, efficient negotiation with the USB device 120 can be realized.

[Integrated circuit device]
The bus relay device 200 in the first to third embodiments can be applied to an integrated circuit device.

FIG. 9 is a block diagram of a first configuration example of an integrated circuit device to which the bus relay device 200 according to any one of the first to third embodiments is applied. 9, parts that are the same as those in FIG. 1 are given the same reference numerals, and descriptions thereof will be omitted as appropriate.
The integrated circuit device 300 includes a USB host 110 and a bus relay device 200, and the USB host 110 and the bus relay device 200 are connected via a bus (internal bus) 310. The USB device 120 is connected to the integrated circuit device 300 via the bus 320. Each of the buses 310 and 320 is a bus specified in the USB standard.

  In such an integrated circuit device 300, the bus relay device 200 is integrated together with the USB host 110 whose capability is known in advance in the same device. Therefore, it is not necessary to insert a USB hub, and communication between the USB host and the USB device is possible with a lower cost and a simpler configuration.

FIG. 10 is a block diagram of a configuration example of an integrated circuit device to which the bus relay device 200 according to any one of the first to third embodiments is applied. 10, parts that are the same as those in FIG. 1 are given the same reference numerals, and descriptions thereof will be omitted as appropriate.
The integrated circuit device 400 includes a USB device 120 and a bus relay device 200, and the USB device 120 and the bus relay device 200 are connected via a bus (internal bus) 410. The USB host 110 is connected to the integrated circuit device 400 via the bus 420. Each of the buses 410 and 420 is a bus specified in the USB standard.

  In such an integrated circuit device 400, the bus relay device 200 is integrated together with the USB device 120 whose capability is known in advance in the same device. Therefore, it is not necessary to insert a USB hub, and communication between the USB host and the USB device is possible with a lower cost and a simpler configuration.

[Modification]
1. First Modification In the first to third embodiments, the example in which one bus relay device 200 is inserted between the USB host 110 and the USB device 120 has been described. However, the embodiment according to the present invention is described. However, the present invention is not limited to this.

FIG. 11 shows a configuration example of a communication system in the first modification of any of the above embodiments. In FIG. 11, the same parts as those in FIG.
The communication system 100a in the first modification includes a USB host 110, a USB device 120, and two bus relay devices 200a. The bus relay device 200a is the bus relay device 200 according to any one of the first to third embodiments. The two bus relay apparatuses 200 a are provided between the USB host 110 and the USB device 120. That is, the USB host 110 and one bus relay apparatus 200a (upstream port unit side) are connected via the bus 130a. The bus relay device 200a (downstream port unit side) and the other bus relay device 200a (upstream port unit side) are connected via a bus 132a. The other bus relay apparatus 200a (downstream port side) and the USB device 120 are connected via a bus 134a. The buses 130a, 132a, and 134a are buses defined in the USB standard.

  FIG. 11 shows a configuration in which two bus relay devices 200 a are provided between the USB host 110 and the USB device 120, but there are three or more bus relay devices between the USB host 110 and the USB device 120. It may be provided.

  According to the first modification, in addition to the effects of any of the above-described embodiments, the communication distance between the USB host 110 and the USB device 120 can be extended without changing the conventional control. .

3.2 Second Modified Example In the bus relay apparatus 200 according to the first embodiment or the second embodiment, the arrangement of terminals connected to the signal lines DP and DM is changed to that of a built-in control register or external terminal (not shown). It may be configured to be changeable by setting.

FIG. 12 shows a configuration example of a communication system in the second modification of any of the above embodiments. In FIG. 12, the same parts as those in FIG.
In the communication system 100b according to the second modification, the bus relay device 200b provided between the USB host 110 and the USB device 120 has the function of the bus relay device 200 in the first embodiment or the second embodiment. . Furthermore, the bus relay apparatus 200b is configured to change the two terminals connected to the signal lines DP and DM in each of the upstream port unit 210 and the downstream port unit 220 by setting a built-in control register or an external terminal (not shown). This is possible. That is, each of the upstream port unit 210 and the downstream port unit 220 includes a first terminal and a second terminal arranged in the first direction. In the first operation mode, the signal on the signal line DP is input / output to / from the first terminal, and the signal on the signal line DM is input / output to / from the second terminal. In the second operation mode, a signal on the signal line DM is input / output to / from the first terminal, and a signal on the signal line DP is input / output to / from the second terminal.

  For example, as shown in FIG. 12, in the bus relay apparatus 200b, the functions of the first terminal and the second terminal are interchanged on the upstream port unit side and the downstream port unit side. By doing so, there is a case where it is not necessary to wire the signal lines constituting the bus connected to both terminals so as to cross each other. Thereby, in addition to the effect by relay of a packet or bus status, communication by USB with reduced noise can be enabled.

〔cable〕
The bus relay device according to any one of the first to third embodiments or the modifications thereof may be built in a USB cable for connecting the USB connectors.

FIG. 13 shows a block diagram of a configuration example of a USB cable to which the bus relay device according to any one of the above-described embodiments or modifications thereof is applied.
The USB cable (cable in a broad sense) 500 includes a first USB connector 510 that conforms to the USB standard, a bus relay device 520, and a second USB connector 530 that conforms to the USB standard. The first USB connector 510 is connected to one end of a first bus 540 that conforms to the USB standard. One end of the upstream port unit and the downstream port unit of the bus relay apparatus 520 is connected to the other end of the first bus 540. The other of the upstream port portion and the downstream port portion of the bus relay device 520 is connected to one end of a second bus 542 compliant with the USB standard, and the second USB connector is connected to the other end of the second bus 542. 530 is connected.

Each of the first USB connector 510 and the second USB connector 530 is a plug or a recessive pull defined by the USB standard. For example, each of the first USB connector 510 and the second USB connector 530 includes a standard A plug, a standard B plug, a mini A plug, a mini B plug, a standard A recess pull, a standard B recess pull, a mini A recess pull, and a mini B recess pull. Or mini-AB resector pull.
The bus relay device 520 is either the bus relay device 200 according to the first embodiment or the second embodiment, or the bus relay devices 200a and 200b according to modifications thereof.

  According to the USB cable 500 shown in FIG. 13, communication between the USB host and the USB device can be realized with the conventional control without inserting a USB hub even in a situation where the waveform of the signal is disturbed. To do.

〔connector〕
The bus relay device according to any one of the first to third embodiments or the modifications thereof may be built in the connector.

FIG. 14 shows a block diagram of a configuration example of a connector to which the bus relay device according to any one of the above-described embodiments or modifications thereof is applied. For example, the connector shown in FIG. 14 is built in an electronic device or the like.
The connector 600 includes a USB connector 610 that conforms to the USB standard and a bus relay device 620. The bus relay device 620 is either the bus relay device 200 of the first embodiment or the second embodiment, or the bus relay devices 200a and 200b in the modified example. The USB connector 610 is connected to one end of a bus 612 that conforms to the USB standard. One end of the upstream port unit and the downstream port unit of the bus relay apparatus 620 is connected to the other end of the bus 612. The USB connector 610 is a plug or a lesser pull defined by the USB standard. For example, the USB connector 610 is a standard A plug, a standard B plug, a mini A plug, a mini B plug, a standard A lesser pull, a standard B lesser pull, a mini A lesser pull, a mini B lesser pull, or a mini AB lesser pull.

  For example, the USB host 110 is connected to the other of the upstream port portion and the downstream port portion of the bus relay device 620 via a bus 614 compliant with the USB standard. Note that the USB device 120 may be connected to the other of the upstream port unit and the downstream port unit of the bus relay apparatus 620 via the bus 614.

  According to the connector 600 shown in FIG. 14, communication between the USB host and the USB device can be realized with the conventional control without inserting the USB hub even in a situation where the waveform of the signal is disturbed. .

〔Electronics〕
The bus relay device according to any one of the first to third embodiments or the modifications thereof can be applied to an electronic device.

FIG. 15A and FIG. 15B are block diagrams of configuration examples of electronic devices to which the bus relay device according to any of the above-described embodiments or modifications thereof is applied.
As shown in FIG. 15A, an electronic device 700 having a USB host function includes a central processing unit (CPU) 710, a memory 720, a USB host 730, and a bus relay device 750. It has. The CPU 710, the memory 720, and the USB host 730 are connected via a bus 740. The memory 720 includes a read-only memory (hereinafter referred to as ROM) or a random access memory (hereinafter referred to as RAM). The bus relay device 750 is either the bus relay device 200 of the first embodiment or the second embodiment, or the bus relay devices 200a and 200b in the modification. The USB host 730 is connected to a USB device outside the electronic apparatus 700 via the bus relay device 750.

  In such an electronic device 700, the CPU 710 that has read a program stored in advance in the memory 720 executes processing corresponding to the program and controls the USB host 730. The USB 730 performs communication based on the USB standard with an external USB device via the bus relay device 750 under the control of the CPU 710.

  As shown in FIG. 15B, an electronic device 800 having a USB device function includes a CPU 810, a memory 820, a USB device 830, and a bus relay device 850. The CPU 810, the memory 820, and the USB device 830 are connected via a bus 840. The memory 820 is configured by a ROM or a RAM. The bus relay device 850 is either the bus relay device 200 of the first embodiment or the second embodiment, or the bus relay devices 200a and 200b in the modified example. The USB device 830 is connected to a USB host outside the electronic device 800 via the bus relay device 850.

  In such an electronic apparatus 800, the CPU 810 that reads a program stored in advance in the memory 820 executes processing corresponding to the program and controls the USB device 830. The USB 830 performs communication conforming to the USB standard with an external USB host via the bus relay device 850 under the control of the CPU 810.

  As electronic devices having the configurations shown in FIGS. 15A and 15B, personal digital assistants (PDAs), digital still cameras, televisions, video cameras, car navigation devices, pagers, electronic notebooks, electronic Paper, calculators, word processors, workstations, videophones, point of sale system (POS) terminals, printers, scanners, copiers, video players, devices with touch panels, display panels such as head-mounted displays and electronic viewfinders Equipment that had been used.

  According to the electronic devices shown in FIGS. 15A and 15B, even in a situation where the waveform of the signal on the receiving side is disturbed, a simpler configuration can be obtained with the conventional control without inserting a USB hub. Communication between the USB host and the USB device becomes possible.

  As described above, the bus relay device, the integrated circuit device, the cable, the connector, the electronic device, the bus relay method, and the like according to the present invention have been described based on the above-described embodiment or a modification thereof. It is not limited to the modification. For example, the present invention can be implemented in various modes without departing from the gist thereof, and the following modifications are possible.

  (1) In any of the above embodiments or modifications thereof, the first port unit according to the present invention is an upstream port unit, the second port unit according to the present invention is a downstream port unit, and the present invention Although the first USB device is described as a USB host and the second USB device according to the present invention is described as a USB device, the present invention is not limited to this. The first port unit according to the present invention is a downstream port unit, the second port unit according to the present invention is an upstream port unit, the first USB device according to the present invention is a USB device, and the second port unit according to the present invention is The same applies to a USB device as a USB host. In this case, the first port control unit according to the present invention corresponds to a downstream port control unit, and the second port control unit according to the present invention corresponds to an upstream port control unit.

  (2) The present invention is not limited to the configuration, control flow, or sequence of the bus relay apparatus described in the above embodiment or its modification.

  (3) In the above-described embodiment or its modification, the USB 2.0 standard has been described as an example, but the present invention is not limited to this. For example, the present invention can be similarly applied to a standard lower than the USB 2.0 standard or a standard improved from the USB 2.0 standard.

  (4) Although the present invention has been described as a bus relay device, an integrated circuit device, a cable, a connector, an electronic device, a bus relay method, and the like in the above embodiment or its modification, the present invention is not limited to this. It is not a thing. For example, a program in which the processing procedure of the bus relay method according to the present invention is described, and a recording medium on which the program is recorded may be used.

10, 100, 100a, 100b ... communication system,
20, 110, 730 ... USB host, 30, 120, 830 ... USB device,
40, 130, 130a, 132, 132a, 134a, 310, 320, 410, 420, 612, 614 ... bus (USB bus),
112, 220 ... downstream port part,
122, 210 ... Upstream port section,
200, 200a, 200b, 520, 750, 850... Bus relay device,
230: upstream port control unit, 232, 242 ... attach processing unit,
234, 244 ... Detach processing unit,
236, 246 ... Speed negotiation processing unit,
238, 248 ... bus status processing unit, 240 ... downstream port control unit,
250 ... relay unit, 252,262 ... sampling unit,
254, 264 ... Elasticity buffer, 300, 400 ... Integrated circuit device,
500 ... USB cable, 510 ... first USB connector,
530 ... second USB connector, 540 ... first bus, 542 ... second bus,
600 ... Connector, 610 ... USB connector, 700,800 ... Electronic device,
710, 810 ... CPU, 720, 820 ... Memory, 740, 840 ... Internal bus

Claims (17)

A first port unit to which a first USB device is connected;
A second port unit to which a second USB device is connected;
A first port control unit for controlling the first port unit;
A second port control unit for controlling the second port unit;
A relay unit that relays a packet transferred between the first port unit and the second port unit;
The bus status detected in one of the first port part and the second port part is reproduced by the other and transmitted,
The first communication speed mode determined by speed negotiation with the first USB device does not match the second communication speed mode determined by speed negotiation with the second USB device. When the second port control unit detaches the second USB device, the second port control unit controls speed negotiation for connecting to the second USB device in the first communication speed mode. Bus relay device. When the first communication speed mode and the second communication speed mode do not match,
The first port controller is
Detachment of the first USB device, and negotiation control for connection with the first USB device in the first communication speed mode after negotiation is performed by the second port control unit. The bus relay apparatus according to claim 1. A first port unit to which a first USB device is connected;
A second port unit to which a second USB device is connected;
A first port control unit for controlling the first port unit;
A second port control unit for controlling the second port unit;
A relay unit that relays a packet transferred between the first port unit and the second port unit;
The bus status detected in one of the first port part and the second port part is reproduced by the other and transmitted,
The first port control unit stores a first communication speed mode determined by negotiation with the first USB device, detaches the first USB device,
After the second port control unit performs negotiation control for connection with the second USB device in the first communication speed mode, the first port control unit and the first USB device A bus relay apparatus that controls negotiation for connection in the first communication speed mode. The relay unit is
4. The bus relay apparatus according to claim 1, wherein a signal corresponding to a packet relayed between the first port unit and the second port unit is transmitted. 5. The first port unit is an upstream port unit to which a USB host is connected,
The bus relay apparatus according to claim 1, wherein the second port unit is a downstream port unit to which a USB device is connected. The first port unit is a downstream port unit to which a USB device is connected,
5. The bus relay apparatus according to claim 1, wherein the second port unit is an upstream port unit to which a USB host is connected. 6. A bus relay device according to claim 5;
An integrated circuit device comprising: the USB host connected to the first port unit. A bus relay device according to claim 6;
An integrated circuit device comprising: the USB device connected to the second port unit. A first USB connector;
A first bus to which the first USB connector is connected at one end;
The bus relay device according to any one of claims 1 to 6, wherein the first port unit is connected to the other end of the first bus.
A second bus to which the second port is connected to one end;
And a second USB connector connected to the other end of the second bus. A USB connector;
A connector comprising: the bus relay device according to claim 1, wherein the first port unit or the second port unit is connected to the USB connector.   An electronic apparatus comprising the bus relay device according to claim 1. A bus relay method performed between an up port unit to which a first USB device is connected and a down port unit to which a second USB device is connected,
A first connection step for negotiating with the first USB device;
A second connection step for negotiating with the second USB device;
Detach the second USB device when the first communication speed mode determined in the first connection step and the second communication speed mode determined in the second connection step do not match. 1 cutting step;
After the first disconnecting step, a third connecting step for performing negotiation for connecting to the second USB device in the first communication speed mode;
A bus relay method comprising a relay step of relaying a packet or a bus status between the first port unit and the second port unit after the third connection step. A second disconnecting step of detaching the first USB device when the first communication speed mode and the second communication speed mode do not match;
After the second disconnecting step and the third connecting step, a fourth connecting step for performing a negotiation for connecting to the first USB device in the first communication speed mode,
The relay step includes
13. The bus relay method according to claim 12, wherein a packet or a bus status is relayed between the first port unit and the second port unit after the fourth connection step. A bus relay method performed between an up port unit to which a first USB device is connected and a down port unit to which a second USB device is connected,
A first connection step of negotiating with the first USB device and storing the determined first communication speed mode;
A first disconnecting step of detaching the first USB device after the first connecting step;
A second connection step for negotiating with the second USB device for connection in the first communication speed mode stored in the first connection step;
After the second connection step, a third connection step for performing negotiation for connection with the first USB device in the first communication speed mode;
A bus relay method comprising a relay step of relaying a packet or a bus status between the first port unit and the second port unit after the third connection step. The relay step includes
The bus status detected in one of the first port part and the second port part is reproduced and transmitted in the other,
15. The bus relay method according to claim 12, wherein a signal corresponding to a packet relayed between the first port unit and the second port unit is transmitted. The first port unit is an upstream port unit to which a USB host is connected,
The bus relay method according to claim 12, wherein the second port unit is a downstream port unit to which a USB device is connected. The first port unit is a downstream port unit to which a USB device is connected,
The bus relay method according to claim 12, wherein the second port unit is an upstream port unit to which a USB host is connected.

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