JP3368867B2 - Communication system and communication equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system and a communication device, and more particularly to a communication system and a communication device for transmitting and receiving data on a high speed transmission line.

[0002]

2. Description of the Related Art In recent years, the performance of central processing units (CPUs) used in personal computers and the like has improved, the performance of graphic chips has increased, and the capacity of communication information in networks has increased. Devices and systems that handle information such as voice in a complex manner have come into use. Further, it has become possible to realize such multimedia information with one digital interface.

As an example of the above digital I / F bus system, electronic devices such as a personal computer, a digital television and a digital video tape recorder are connected by a 1394 serial bus, and digital video signals and digital audio signals are connected between these electronic devices. A communication system for transmitting and receiving control signals has been proposed (for example, Japanese Patent Laid-Open No. 10-290237).

In this conventional communication system, a node can receive a physical layer controller (hereinafter referred to as PHY) on a serial bus, a link layer controller (hereinafter referred to as LINK), and a central processing unit (CPU). When,
It consists of various registers, configuration ROM, buffer memory, hard disk interface, and hard disk device.
A packet called a D packet is sent to the bus.

Here, the maximum transfer rate of PHY is LINK.
Packet loss occurs when the transfer rate is faster than the maximum transfer rate of
After creating a speed map by looking at the maximum communication speed information of Y, the configuration ROM of another node is read, and the speed map related to the node whose maximum transfer speed of LINK is slower than the maximum transfer speed of PHY is corrected. .

[0006]

However, in the above-mentioned conventional communication system, the transfer rate of the lower one of the plurality of PHYs and LINKs is adopted, so that PHY and LI are used.
When either one of NK has a low transfer rate, there is a problem that high-speed transfer cannot be performed even if the other has a high transfer rate.

The present invention has been made in view of the above points, and by mounting a plurality of PHYs or LINKs,
An object of the present invention is to provide a communication system and a communication device that enable high-speed communication even if PHY or LINK is a low speed alone.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention uses an internal bus to generate an error correction code.
The link layer controller , which includes the functions of generation / detection and packet generation / detection, is used for bus initialization and data encapsulation.
Code / decode, arbitration, bias voltage
Physical layer controller and application including functions such as output / detection of
In a communication system in which a plurality of communication devices having a data transmission / reception function, which are at least connected to a central processing unit having an application layer function, are serially connected via a serial bus, At least one of the connected communication devices includes at least one of a link layer controller, a physical layer controller, and a central processing unit arranged in parallel, and when a data transmission / reception request is made.
Number of physical layer controllers in the device, maximum transfer rate, etc.
To send status information of other communication devices to the communication device on the sending side.
And the receiving communication device received from the receiving communication device
Link layer in the receiving communication device based on the status information of
Controller, physical layer controller and central processing unit
Of the same type as the device provided with multiple devices
Layer controller, physical layer controller or central processing unit
The number of devices in parallel and use the smaller number of devices in parallel.
And a means for deciding to transmit by using a plurality of link layer controllers, physical layer controllers, and central processing units that are provided in parallel to communicate with a communication device of a communication partner. And

Further, in order to achieve the above object, the present invention comprises a plurality of communication devices each having at least a link layer controller connected to a physical layer controller and a central processing unit by an internal bus and having a data transmitting / receiving function. In a communication system serially connected via a serial bus, at least one communication device connected to the serial bus has a function of bus initialization, data encoding / decoding, arbitration, and bias voltage output / detection. A plurality of physical layer controllers are provided in parallel, and a PHY controller having a data division / data combining function is provided between the plurality of physical layer controllers and the link layer controller, and Communication device status information and multiple physical layer controllers Based on the respective maximum transfer rate of La, and performs communication with the communication device of the communication partner by using a plurality of physical layer controller in parallel.

Here, a communication device in which a plurality of physical layer controllers are provided in parallel is provided with a plurality of link layer controllers and has a LINK controller between the plurality of link layer controllers and the central processing unit. Characterize.

In the communication system of the present invention, each of the first and second communication devices connected to the serial bus has the functions of bus initialization, data encoding / decoding, arbitration, and bias voltage output / detection. A plurality of physical layer controllers each having an PHY controller are provided in parallel, and a PHY controller having a data division / data combining function is provided between the plurality of physical layer controllers and the link layer controller. Authentication / authentication between each one first physical layer controller in communication equipment
The first serial bus for key exchange is connected, and each second physical layer controller in the first and second communication devices is connected by the second serial bus for data transfer,
Pseudo disconnecting each PHY controller in the first and second communication devices, transmitting authentication / key exchange information via the first serial bus, and transmitting encrypted data via the second serial bus. It is characterized by doing.

In order to achieve the above object, the communication device of the present invention has functions of bus initialization, data encoding / decoding, arbitration, bias voltage output / detection, etc., and is connected to a serial bus. A physical layer controller, a link layer controller having functions of error correction code generation / detection, packet generation / detection, etc., and a central processing unit having an application layer function connected to the link layer controller by an internal bus. , A memory connected to the central processing unit, which stores the value of the maximum transfer rate, and a recording / reproducing means for recording the program of the transmission / reception procedure, the program being appropriately read by the central processing unit. At least one of the layer controller, the link layer controller, and the central processing unit is provided in parallel. In addition, a control circuit having a function of dividing the data on the upstream side of the data and combining the data on the downstream side of the data is provided between at least one of the link layer controller, the physical layer controller, and the central processing unit. Characterize.

In the communication system and communication equipment of the present invention,
Since a plurality of physical layer controllers (PHY) or a plurality of link layer controllers (LINK) are provided in the communication device, a plurality of PHYs or a plurality of LINs are provided.
K can be used in parallel. Further, in the present invention,
If the number of PHY and LINK are different, PH between them
By providing the Y controller, it is possible to connect to a communication device having a single PHY.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of a communication device according to the present invention. Communication device 1 is 2
The physical layer controllers PHY2 and PHY3 are provided, and the PHY controller 4 is connected to the PHY2 and PHY3 by the internal bus, the link layer controller LINK5 is connected to the PHY controller 4 by the internal bus, and the internal bus. By LINK5
CPU6 connected to CPU6 via internal bus
Various registers 7 connected to, a configuration ROM 8, a buffer memory 9, a hard disk interface 10, and a hard disk (HDD)
11 is provided. A 1394 serial bus 12 is connected to each of the PHY2 and PHY3 ports.

The PHY 2 and PHY 3 have functions such as bus initialization, data encoding / decoding, arbitration, and bias voltage output / detection. PH
The Y controller 4 uses the data dividing / combining circuit to PHY the data in the packet when generating / detecting the packet.
2, PHY3 or LINK5. The LINK 5 has functions such as error correction code generation / detection and packet generation / detection.

The CPU 6 has the function of the application layer and stores the program of the transmission / reception procedure in the HDD 1.
The recording program is read from the HDD 1 through the HDD I / F 10 as appropriate, and the transmission / reception procedure described below is executed. The 1394 serial bus 12 is an Institute of Electrical and Electronics Engineers (IEEE)
E) is a high-speed transmission path by the serial interface IEEE 1394 having a standardized real-time transmission function.

FIG. 2 shows a block diagram of an embodiment of the PHY controller 4 in FIG. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals. As shown in FIG.
The PHY controller 4 includes a mode controller 20, a data divider 21, and a data combiner 22. PH
Y2 and 3 have a function of propagating a packet not addressed to its own device to an adjacent node (hereinafter referred to as “repeat”), and the mode controller 20 does not use the repeat mode 23, the data reception mode, the data transmission mode. The four modes of the non-use mode 24 indicating the are stored.

The data divider 21 is a circuit for dividing a certain data into a plurality of data and transmitting them to the PHYs 2, 3. The data combiner 22 is a circuit that converts the data received from the PHYs 2 and 3 into normal data. Also, when combining, it is necessary to clearly indicate the division method, order, and the like. Also regarding this, it may be embedded in the packet by a predetermined method.

The configuration RO shown in FIG.
As the maximum transfer rate value recorded in M8, the fastest PHY among PHYs 2 and 3 may be recorded. In addition, the ID of the PHY is recorded in the recording medium, and the PH
Even if there is only one Y, it operates without problems.
A plurality of communication devices 1 having the above-described configuration shown in FIG. 1 or a plurality of communication devices having the same configuration as described above are connected via a 1394 serial bus to configure the communication system described above. Although the number of PHYs in the communication device is two in FIG. 1, it may be one or three or more depending on the communication device. Further, among these communication devices, the data transmitting side is referred to as a transmitting side device, and the receiving side is referred to as a receiving side device.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. First, when there is a data transmission / reception request from the transmission side device or the reception side device (step A1 in FIG. 3), the reception side device displays information such as the number of PHYs recorded on a recording medium such as a hard disk and speed. It is transmitted to the transmission side by a transfer method suitable for transfer of the control command (hereinafter referred to as Asynchronous transfer) (step A2 in FIG. 3).

Upon receiving this, the transmitting side device sends the communication method, for example, the number of PHYs to be used, to the receiving side device (step A3 in FIG. 3). If no information such as the number and speed of PHYs is sent within a fixed time, for example, 100 ms after the transmission / reception request, the mode of the mode controller 20 is the non-use mode 24, and this function is automatically set. Make it an unsupported device.

As a method of determining the communication method to be transmitted by the transmitting side device, the smaller number of PHYs that the transmitting side device and the receiving side device respectively have. For example, the transmitting device has three PHYs (P
HY01 (S100), PHY02 (S400), PH
Y03 (S200)) (Here, S100 is 98.30.
4 Mbps, S200 is 196.608 Mbps, S4
00 is 393.216 Mbps. Below, for simplicity, S100 is 100 Mbps and S200 is 200 Mbps.
s, S400 is also referred to as 400 Mbps), and the receiving device has two PHYs (PHY11 (S200), PHY).
12 (S200)), it is possible to send and receive P
The number N of HY is "2". The transmitting side device sends the information about the number of PHYs that can be transmitted / received to
After transmitting by nchronous transfer (step A3 in FIG. 3), a transfer method suitable for real-time transfer (hereinafter, I
Data is transmitted by so-called transfer.

Next, the transmitting side device divides the data to be transmitted by the data divider 21 of FIG. 2, and transmits the packet data in the most efficient combination based on the maximum communication speed for each of PHYs 2 and 3 (see FIG. 3 step A4). At this time, the PHY of the target receiving device in the packet
The information of is incorporated. The receiving device that received the packet data determines whether or not the data is addressed to itself based on the information of the built-in PHY. If the data is addressed to itself, the data combiner 22 of FIG. Data is combined and sent to LINK5.

FIG. 4 shows a case where the maximum transfer rate of PHY becomes a bottleneck and the overall performance is degraded. CPU 413 and CPU 423 are device #
1 shows the application layer of device # 2. In this case, the maximum transfer rate of device # 1 is 200 Mbps, and the maximum transfer rate of device # 2 is 400 Mbps. The maximum transfer rate of PHY411 of device # 1 is S2
In this example, 00 is slower than the other S400s, and therefore the whole is affected.

On the other hand, The case where this embodiment is applied is shown in FIG. FIG. 5 is a schematic configuration diagram of the first embodiment of the communication system according to the present invention. In the figure, the communication device 27 of the device # 1 and the communication device 28 of the device # 2 are both communication devices having the configuration shown in FIG. 1, and in FIG.
HY512, PHY521 and PHY522, and LIN
Although K513, 523 and CPUs 514, 524 are shown in the figure, actually, as shown in FIG. 1, PHY controllers are provided between PHY511 and PHY512 and LINK513, and between PHY521 and PHY522 and LINK523. Further, an HDD, a configuration ROM, etc. are connected to the CPUs 514, 524.

Communication device 27 of device # 1 and device #
The second communication device 28 is connected to the IEEE 1394 serial bus. Note that it may be serially connected to another communication device in the same manner via an IEEE 1394 serial bus. Here, the communication device 27 of the device # 1 has a low transfer rate of S200 (200 Mbps), but has two PHYs 511 and 512.
The communication device 28 of the device # 2 has a transfer rate of S400 (4
00 Mbps PHY521 and S200 (200 Mbps)
Since it has two PHYs of PHY 522 (ps), both devices # 1 and # 2 can perform parallel data transfer using two PHYs.

Therefore, the maximum transfer speed of the communication device 27 of the device # 1 is 400 Mbps and the maximum transfer speed of the communication device 28 of the device # 2 is 600 Mbps, so that the maximum transfer speed is 400 Mbps as a whole, as shown in FIG. Higher speed communication is possible than the conventional example.

Next, the data divider 21 and the data combiner 22 shown in FIG. 2 will be described. FIG. 6 shows packets of data to be transferred (P1, P2, P3, P4, P5, P6,
This is an example in which P7, P8) is divided by the data divider 21 according to the PHY performance. In the figure, PHY611, P
HY612, PHY613, PHY621, PHY62
2, the maximum transfer rate of PHY623 is S40
0, S400, S200, S400, S200, S20
If it is 0, the packets transmitted and received by the PHY of the transmitting device and the PHY of the receiving device are as follows.

PHYs 621 and 622 of the transmitting device,
The packet to be transmitted in 623 is PHY 621 is P1,
P2, P5, P6, PHY622 are P3, P7, PH
Y623 becomes P4 and P8. Further, the packets received by the PHYs 611, 612, and 613 of the receiving side device are the PHY 611, P1, P2, P5, P6, and PHY.
612 is P3, P7, and PHY 613 is P4, P8. Since the information indicating the order is embedded in the packet, the data combiner 22 rearranges the information in the order, and the original data (P1, P2, P3, P4, P5, P6, P7,
P8).

Next, another embodiment of the present invention will be described. FIG. 7 shows a schematic configuration diagram of a second embodiment of a communication system and a communication device according to the present invention. In FIG. 7, in the communication device 30 according to the second embodiment of the present invention, two LINKs 732 and 733 are connected to the CPU 734 which is an application layer, and one PHY. The PHY 731 is connected to the PHY 721 of the device # 2 via the serial bus.

Instead of the communication device 30 as the device # 1 in the related art, as shown in FIG. 8, a LINK 812 and a PHY 8 are used.
A communication device 31 including one 11 is connected, and C
Assuming that the maximum transfer rate of the LINK 812 connected to the PU 813 is S400 and the maximum transfer rate of the PHY 811 is S200, the maximum transfer rate of the device # 1 is 20.
It becomes 0 Mbps. On the other hand, regarding the maximum transfer rate of the device # 2, the maximum transfer rate of the LINK 722 connected to the CPU 723 is S400, and the maximum transfer rate of the PHY721 is S4.
If it is 00, it will be 400 Mbps. However, since the maximum transfer rate of the device # 1 is 200 Mbps, only a transfer rate of 200 Mbps can be obtained as a whole, and the maximum transfer rate of the LINK 812 becomes a bottleneck, which lowers the overall performance.

On the other hand, referring to FIG. 7, in the communication device 30 of the device # 1, two LINKs 732 and 733 are provided.
Has a maximum transfer rate of S200, but two are provided in parallel, so if the maximum transfer rate of the PHY 731 is S400, the maximum transfer rate of the whole is 4
It becomes 00 Mbps. On the other hand, since the device # 2 has the same configuration as that of FIG. 8, its maximum transfer rate is 400 Mbps. As a result, the communication system as a whole can communicate at 400 Mbps.

Since the data flowing from the PHY 731 to the CPU 734 or from the CPU 734 to the PHY 731 is controlled, a LINK controller (not shown) is required in the middle. The LINK controller is composed of a data divider, a data combiner, and a mode controller, and divides the data upstream in the data stream and combines the data downstream. As a result, the communication device 30 having the configuration of FIG.
By using, the transfer rate, which has been a bottleneck at the LINK level, can be improved, and the data transfer rate can be increased.

Next, a third embodiment of the communication device according to the present invention will be described. FIG. 9 shows a schematic configuration diagram of a third embodiment of a communication system and a communication device according to the present invention. In the figure, the communication device 41 of the device # 1 and the communication device 42 of the device # 2 have the same configuration, respectively, and constitute the third embodiment of the communication device of the present invention.
1 is two PHYs 911 and 912, a controller CTRL 913 connected to the PHYs 911 and 912,
Two LINs connected to the controller CTRL913
K 914 and 915, and an application layer CPU 916 connected to the LINKs 914 and 915. The communication device 42 includes two PHs.
Y921 and 922, controller CTRL923 connected to PHY921 and 922, and controller C
Two LINKs 924 and 9 connected to TRL923
25 and an application layer CPU 926 connected to the LINKs 924 and 925.

The CTRLs 913 and 923 are each composed of a data divider, a data combiner, and a PHY-LINK controller, and divide the data upstream in the data stream and combine the data downstream. All PHY or L
In the communication device 41 having the same maximum INK transfer rate,
PH of PHY-LINK controller of CTRL 913
The correspondence between Y and LINK is PHY911 and LINK9.
14, and PHY912 and LINK915, or
There are two combinations of PHY911 and LINK915 and PHY912 and LINK914.

When a certain PHY is different from the maximum transfer rate of another PHY, or a certain LIN like the communication device 42
If K 924 is different from the maximum transfer rate of the other LINK 925, the CTRL 923 receives the LINK 924 or the LINK from the PHY 921 or the PHY 922 when receiving.
LINK and PHY for passing data to 925 are associated. Similarly, during transmission, PHY and LINK are associated with each other. High-speed PHY or LIN when associating
Ks are associated with each other. This allows PHY and LINK
There is an advantage in that the transfer speed, which has been a bottleneck at the above level, can be improved, and the data transfer speed can be increased.

FIG. 10 is a schematic block diagram of a fourth embodiment of the communication system and the communication device of the present invention, which has the communication device which does not use the controller between the plurality of LINKs and the plurality of PHYs. In this example, the communication device 43 of the device # 1 has two LINKs 934 and 935 and two PHs.
A communication device that does not use a controller between Y931 and 932, and the communication device 44 of the device # 2 has two PHs.
It is a communication device in which Y941 and 942 and one LINK 943 are connected.

Since the communication device 43 does not use the controller between the two LINKs 934 and 935 and the two PHYs 931 and 932, the data flow is PH.
Y931 and LINK934, and PHY932 and LI
There is only one combination of NK935. This combination is uniquely determined at the time of hardware design.

Next, a case where the present invention is applied to a CPU (application layer) will be described. FIG. 11 (a)
(H) shows a schematic configuration diagram of a communication device of the fifth to twelfth embodiments of the present invention, which is characterized in that a plurality of CPUs are provided. When two CPUs are provided, FIGS. 11 (a) to 11 (h)
There are 8 combinations of
When only a plurality of CPUs and PHYs are provided, when a plurality of CPUs and PHYs are provided, in the same figure (c), a plurality of CPUs and LINKs are uniquely connected, and in the same figure (d) is a CPU. And multiple LINKs and variably connected, same figure (e)
Is the CPU, LINK, PHY, CPU-L
Variable connection between INK, FIG.
A plurality of LINKs and PHYs and a variable connection between LINKs and PHYs. In the same figure (g), CPU, LINK, P
Multiple HY, CPU-LINK and LINK-PH
Variable connection between Y, FIG. 6 (h) shows CPU, LI
A plurality of NKs and PHYs are connected uniquely.
Although not shown, if the CPU and the LINK are not the same number, the LINK controller is the CPU and the LINK.
, And if LINK and PHY are not the same number, then the PHY controller is between LINK and PHY.

Next, a case where the present invention is applied to 1394 copy protection will be described. "1394 copy protection" performs device authentication / key exchange between devices # 1 and # 2 by Asynchronous transfer, and shares a secret key with other devices. Data is encrypted using the shared key and
Content is protected by transmitting and receiving by chronous transfer. However, since the information about the key exchange flows on the 1394 bus, a part of the information about the key exchange is known to other devices.

Therefore, a case where the present invention is applied is shown in FIG. FIG. 12 is a schematic configuration diagram of the fifth embodiment of the communication system according to the present invention, in which the CPU 004 sets LINK0.
Communication device 51 that is variably connected to two PHY001 and PHY002 via 03, and CPU008 is LINK0.
In a communication system in which two PHY 005 and a communication device 52 variably connected to PHY 006 via 07 are connected via cables 53 and 54, a 1394 serial bus for authentication / key exchange (hereinafter referred to as the first A cable 53 of a bus) is connected between PHY002 and PHY005, and a cable 54 of a 1394 serial bus (hereinafter, second bus 54) for data transfer is connected to PHY001 and PHY006.
, And a PHY controller (not shown in FIG. 12, but LINK003, 00).
7 and each of the two PHYs 001 and 002, 005 and 006) are pseudo-cut.

As a result, the authentication / key exchange information flows only through the first bus 53, and only the encrypted data flows through the second bus 54. As a result, the information about the key exchange does not flow to the other devices connected to the second bus 54 at all, so that the content can be protected more robustly.

Next, Isochronous transfer and As
A case where the present invention is applied to the proper use of the asynchronous transfer will be described with reference to FIG. FIG. 13 is a schematic configuration diagram of the sixth embodiment of the communication system according to the present invention, in which the CPU 014 connects two Ps via the LINK 013.
Communication device 6 variably connected to HY011 and PHY012
1 and the CPU 018 sends two P's via the LINK 017.
Communication device 6 variably connected to HY015 and PHY016
2 is connected via cables 63 and 64, Asynchronous transfer is performed between PHY012 and PHY015 via cable 64, and Isoc is transferred between PHY001 and PHY016.
It is assumed that the hornous transfer is performed via the cable 63.

Here, if the need for Asynchronous transfer occurs during Isochronous transfer,
Iso for transmission of Asynchronous transfer
There may be a delay in chronous transfer. However, in the communication system of FIG. 13, Isochrono
Since it is possible to send and receive the us transfer and the Asynchronous transfer separately, for example, in the 1394 copy protection, when receiving the data by the Isochronous transfer and updating the key by the Asynchronous transfer, the key exchange can be performed without delay. It will be possible.

The present invention is not limited to the above-described embodiment. For example, in FIGS. 12 and 13, two cables 53 and 54, 63 and 64 are used. It is needless to say that the cables of FIG. 12 and FIG. 13 may be combined into one cable to connect the devices to each other as indicated by the hatched lines. Further, the HDD 11 of FIG. 1 is a recording medium in which a program for executing the procedure of FIG. 3 is recorded, but it may be recorded in a floppy disk or a memory.

[0046]

As described above, according to the present invention,
Since a plurality of physical layer controllers (PHY) or a plurality of link layer controllers (LINK) are provided in the communication device, a plurality of PHYs or a plurality of LINs are provided.
Since K is used in parallel, high-speed communication can be performed even if the PHY unit or the LINK unit has a low transfer rate.

Further, according to the present invention, PHY and LINK
When the number of different PHYs is different, by providing a PHY controller between them, it is possible to connect to a communication device having a single PHY, and even if a communication device having a single PHY is connected, communication can be performed. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of a communication device according to the present invention.

FIG. 2 is a block diagram of an embodiment of a PHY controller in FIG.

FIG. 3 is a flowchart of data transmission / reception according to an embodiment of the communication system of the present invention.

FIG. 4 is a block diagram of an example of a conventional communication system in the case where the maximum transfer rate of PHY is a bottleneck and overall performance is degraded.

FIG. 5 is a schematic configuration diagram of the first embodiment of the communication system of the present invention.

FIG. 6 is an explanatory diagram of a data divider and a data combiner of FIG.

FIG. 7 is a schematic configuration diagram of a second embodiment of a communication system and a communication device of the present invention.

FIG. 8 is a block diagram of an example of a conventional system in which the maximum performance of LINK is a bottleneck and overall performance is degraded.

FIG. 9 is a schematic configuration diagram of a third embodiment of a communication system and a communication device of the present invention.

FIG. 10 is a schematic configuration diagram of a communication system and a communication device according to a fourth embodiment of the present invention.

FIG. 11 is a schematic configuration diagram of each embodiment of the communication device of the present invention.

FIG. 12 is a schematic configuration diagram of a fifth embodiment of the communication system of the present invention.

FIG. 13: Isochronous transfer and Asynch
It is a schematic block diagram of the 6th Embodiment of the communication system of this invention which used the different transfer properly.

[Explanation of symbols]

1, 27, 28, 30, 31, 41-44, 51, 5
2, 61, 62 Communication equipment 2, 3, 411, 421, 511, 512, 521, 5
22, 621 to 623, 721, 731, 911, 91
2,921,922,931,932,941,94
2,001,002,005,006,011,01
2, 015, 016 Physical Layer Controller (PHY) 4 PHY Controller 5, 412, 422, 513, 523, 611-61
3, 721, 722, 732, 733, 914, 91
5, 924, 925, 934, 935, 943, 00
3,007,013,017 Link Layer Controller (LINK) 6, 413, 423, 514, 524, 723, 73
4, 813, 916. 926, 936, 944, 00.
4, 008, 014, 018 Central processing unit (CPU) 8 Configuration ROM 11 Hard disk drive (HDD) 12 1394 serial bus 20 Mode controller 21 Data divider 22 Data combiner 53, 54, 63, 64 Cable

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Claims (7)

(57) [Claims] 1. An error correction code of each internal bus
The link layer controller , which includes the functions of generation / detection and packet generation / detection, is used to initialize the bus and data.
Code / decode, arbitration, bias power
Physical layer controller and A including the function of the output / detection of pressure
At least a central processing unit with application layer functions
In a communication system in which a plurality of communication devices connected to each other and having a data transmission / reception function are serially connected via a serial bus, at least one communication device connected to the serial bus is the link layer. controller, at least one is provided in parallel a plurality, the physical layer in its own device at the time of data transmission and reception request for the physical layer controller and the central processing unit controller
Status information of communication devices such as the number of
A means for transmitting to the communication device on the receiving side, and a means for receiving the communication device on the receiving side received from the communication device on the receiving side.
Based on the status information,
Link layer controller, physical layer controller and central processing
A device of the same type as a device provided with a plurality of processing devices
In the link layer controller, physical layer controller or
Compares the number of central processing units and
And means for deciding to send using in parallel ,
A communication system characterized in that a plurality of devices among the link layer controller, the physical layer controller, and the central processing unit are used in parallel to communicate with a communication device of a communication partner. 2. A plurality of communication devices each having at least a link layer controller connected to a physical layer controller and a central processing unit by an internal bus and having a data transmitting / receiving function are serially connected via a serial bus. In the communication system, at least one communication device connected to the serial bus is provided with a plurality of physical layer controllers having functions of bus initialization, data encoding / decoding, arbitration, and bias voltage output / detection in parallel. A packet is generated / generated between the plurality of physical layer controllers and the link layer controller.
When detecting, a PHY controller having a data division / data combination function of dividing / combining the data in the packet is provided, and the status information of the communication device of the communication partner received from the communication partner, A communication system characterized in that a plurality of physical layer controllers are used in parallel to communicate with a communication device of a communication partner based on respective maximum transfer rates of the plurality of physical layer controllers. 3. A communication device in which a plurality of physical layer controllers are provided in parallel is provided with a plurality of link layer controllers, and a LINK controller is provided between the plurality of link layer controllers and the central processing unit. The communication system according to claim 2, further comprising: 4. The communication device uses the first transfer method suitable for transfer of a control command to transmit information on the number of the physical layer controller and the link layer controller and their maximum transfer rates when a data reception request is made by the transmission side. When data is requested to be transferred to a communication device via the serial bus, the required physical level is calculated based on the number of the physical layer controllers and link layer controllers transmitted from the communication partner and information on their maximum transfer rates. 4. The communication according to claim 2, wherein the number of layer controllers and link layer controllers and the transfer speed are determined, and the data is transmitted to the communication device on the receiving side by the second transfer method suitable for real-time transfer. system. 5. A plurality of communication devices each having at least a link layer controller connected to a physical layer controller and a central processing unit by an internal bus and having a data transmitting / receiving function are serially connected via a serial bus. In the communication system, each of the first and second communication devices connected to the serial bus includes the physical layer controller having functions of bus initialization, data encoding / decoding, arbitration, and bias voltage output / detection. A plurality of PHY controllers, which are provided in parallel and have a data dividing / data combining function, are provided between the plurality of physical layer controllers and the link layer controller, and in the first and second communication devices. Each one of the first physical layer controllers for authentication / key exchange One serial bus is used to connect the second physical layer controllers in the first and second communication devices to each other with a second serial bus for data transfer. Pseudo disconnecting each PHY controller in the communication device, transmitting authentication / key exchange information through the first serial bus, and transmitting encrypted data through the second serial bus. Characterized communication system. 6. In a communication device used in a communication system in which a plurality of communication devices are serially connected via a serial bus, functions such as bus initialization, data encoding / decoding, arbitration, and bias voltage output / detection are provided. A physical layer controller that is connected to the serial bus, a link layer controller that has functions such as error correction code generation / detection and packet generation / detection, and an internal bus that is connected to the link layer controller. A central processing unit having an application layer function, a memory connected to the central processing unit that stores the value of the maximum transfer rate, and a program of a transmission / reception procedure are recorded, and the program is executed by the central processing unit. And a recording / reproducing means for appropriately reading the At least one of the C-layer controller and the central processing unit is provided in parallel, and the data is divided on the upstream side of the data between the link layer controller and at least one of the physical layer controller and the central processing unit. , A communication device having a control circuit having a function of combining data on the downstream side of the data. 7. The plurality of physical layer controllers,
When the number of the link layer controllers is one, the control circuit provided between the physical layer controller and the link layer controller is the PHY controller.
The PHY controller divides the input data into a plurality of pieces of data and transmits the divided pieces of data to the plurality of physical layer controllers, respectively, and data received through the plurality of physical layer controllers. A data combiner that combines and converts the data into normal data and outputs it to the link layer controller, a repeat mode that transfers packets that are not addressed to itself to an adjacent communication device, a data transmission mode that transmits data, and a data reception 7. The communication device according to claim 2, 5 or 6, further comprising a mode controller that sets one of a data reception mode and a non-use mode.