JP2003198578A - Network device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a network device in which transmission setting is stably negotiated between a PHY device connected to a counter device and an SW device (MAC switch) in the auto-negotiation of transmission setting with the counter device. <P>SOLUTION: In the network system, an SW device 2 is made monitor and change setting data (transmission setting) on the transmission speed and the transmission mode of a PHY device 1, namely, the SW device 2 itself does not have an auto-negotiation function but a control part 3 monitors transmission setting of the PHY device 1. When a change in transmission setting of the PHY device 1 is detected, the control part 3 changes transmission setting of the SW device 2 into new transmission setting of the PHY device 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a local area network (LAN), and more particularly to a network device related to auto negotiation in Ethernet (registered trademark).

[0002]

2. Description of the Related Art When connecting a network, the communication speed (100BASE-TX
/ 10BASE-T) or communication mode (full duplex / half 2
If the weight is different, an auto-negotiation function that matches the communication speed and communication mode of the other party is required. Conventionally, in a network device having an auto negotiation function, OSI (Open System Interconnectio)
n) The block that terminates Layer 1 to Layer 2 or Layer 1 to Layer 3 in the reference model is shown in FIG.
It is connected in a configuration like. FIG. 3 is a block diagram showing the configuration of a conventional network device.

Here, the PHY device 1 is a physical layer device, and is 10BASE-T / 100BASE.
-Connected to the opposite device via a TX connector and a transformer for matching between the connector and the PHY device. The PHY device 1 is a layer 1 terminating circuit that terminates an Ethernet (registered trademark) frame transmitted / received to / from the opposite device, and uses the auto negotiation function to communicate with the opposite device to control the communication speed and It has the function of automatically determining the communication mode.

The SW device 2 is a layer 2 or layer 3 Ethernet switch (or MAC).
A switch, which has a transfer processing function of transferring a frame in accordance with a MAC (Media Access Control) address of an Ethernet (registered trademark) frame. MII (Media Independent Interface) is PHY
(Physical layer in communication protocol) An interface for transmitting and receiving data of an Ethernet (registered trademark) frame waveform-shaped by the PHY device 1 between the device 1 and the SW device 2, and communication speed and communication of the device. Since the format of data transmitted / received differs depending on the mode, it is necessary to match the communication speed and the communication mode of the PHY device 1 and the SW device 2 with each other. Here, SMI (MII Management In
terface) is an interface for the SW device 2 to control the PHY device 1 such as communication speed, communication mode, auto negotiation setting, and monitor the state of the PHY device 1. This SMI is composed of an information frame, which is bidirectional serial data called MDIO, and a clock, which is output from the SW device 2, called MDC.

As described above, when connecting network devices, the auto-negotiation function exchanges information on the communication speed and communication mode at which the connected devices can communicate with each other, and the connected network devices communicate with each other. It is a function that automatically determines the best possible transmission settings (including communication speed and communication mode). For this auto negotiation function, refer to IEEE80
It is regulated by 2.3u.

For example, two connected devices are each capable of auto-negotiation, and one device is 100BASE-TX full duplex, 100BASE-
TX half double, 10BASE-T full double, 10BASE
-T Has half-duplex function, the other device is 1
00BASE-TX Half Duplex, 10BASE-T All 2
In the case of having the function of heavy, 10BASE-T half-duplex, it is set to 100BASE-TX half-duplex, which enables the highest speed communication, according to the priority order defined by IEEE802.3u.

In addition, the IEEE802.3u standard that defines auto negotiation also defines a parallel detect function. This parallel detect function matches only the communication speed and forces the communication mode when one of the two connected devices supports auto-negotiation and the other does not support auto-negotiation. It is a function to set half-duplex.

[0008]

In the conventional method, the PH
In order to control the Y device, there is a method of controlling the PHY device 1 using a control circuit 21 including a logic circuit as shown in FIG. However, the control circuit 21, like the SW device 2,
PH using MI (MII Management Interface)
Since the negotiation control is performed on the Y device 1, the PHY device 1 cannot be controlled when the control from the SW device 2 and the control from the control circuit 21 overlap.

For example, the operation when the power is turned on with the auto negotiation function of the apparatus set to valid will be described. When the power is turned on, first, the PHY device 1
When the auto-negotiation function is set to be valid, the auto-negotiation is performed with the opposite device and transmission settings such as communication speed and communication mode are set. Then, when the SW device 2 is set to enable the auto negotiation function, the SW device 2 sets the internal register storing the transmission setting information of the PHY device 1 to SMI.
Is always monitored by using.

Further, the SW device 2 detects the transmission setting of the PHY device 1 determined by the auto negotiation, and changes its own transmission setting to the same transmission setting as the PHY device 1. In this way, SW device 2 and P
By matching the transmission settings with the HY device 1,
It is possible to send and receive Ethernet (registered trademark) frame data between both devices.

Therefore, when the DIPSW-10 is set to enable the auto negotiation function, the DIPSW
The detection unit 9 outputs to the control circuit 21 a control signal indicating that the auto negotiation function is valid. Then, the control circuit 21 controls the PHY device 1 and the SW.
A control signal that enables the auto negotiation function is output to the device 2. As a result, the PHY device 1 and the SW device 2 are set to enable the auto negotiation function.

With the above settings, the SW device 2 is set to SM
I is used to constantly monitor the PHY device 1 and the operation of adjusting its own settings to the PHY device 1 is started. Therefore, in the above-mentioned conventional example, the MDIO frame (including a data pattern such as an instruction) for monitoring the PHY device 1 output by the SW device 2 and the control for the PHY device 1 output by the control circuit 21 are used. There is a drawback that the control circuit 21 cannot control the PHY device 1 when it collides with the MDIO frame. Further, in the conventional example, due to this MDIO frame collision, the operation of the PHY device 1 and the SW device 2 is abnormal (unstable).
There is also a problem.

In consideration of the above points, the present invention, in auto-negotiation of the transmission setting with the opposite device, the PHY device and the SW device (MAC switch).
It is an object of the present invention to provide a network device in which negotiation with the network device is stably performed.

[0014]

In a network device of the present invention, transmission settings including a communication speed and a communication mode are matched with the connected opposite device by auto negotiation. A PHY control unit which is a network device and has a PHY device having a terminating function of a frame (for example, an Ethernet (registered trademark) frame) transmitted / received to / from an opposite device, and which reads out the transmission setting set in this PHY device (PHY
The S having a transfer processing function of transferring a frame transmitted and received between the control unit 4) and the opposite device to another device.
A SW control unit (SW control unit 7) for controlling the W device,
A negotiation control unit (control unit 3) that matches the transmission setting of the SW device with the transmission setting of the PHY device that is read out by the PHY control unit and is set by being combined with the opposite device by the auto negotiation function. It is characterized by including.

The network device of the present invention is the PHY.
The control unit enables or disables the auto-negotiation function of the PHY device.
It is characterized by setting a communication speed and a communication mode of the device. The network device of the present invention is the PHY
The control unit has a function of detecting the transmission setting of the PHY device at predetermined intervals.

The network device of the present invention is the PHY.
The control unit has a timer that outputs a sampling signal for detecting the transmission setting of the PHY device at regular intervals. The network device of the present invention is
It is characterized in that the PHY control unit includes a detection unit that performs a detection process of whether or not the transmission setting of the PHY device has changed at each sampling interval.

The network device of the present invention is characterized in that the SW control unit sets the transmission setting of the PHY device detected by the PHY control unit as a communication speed and a communication mode of the SW device. The network apparatus of the present invention is characterized in that the PHY control unit includes a comparison unit that compares the transmission setting of the PHY device and the transmission setting of the SW device.

In the network device of the present invention, when the SW control unit detects that the transmission setting of the PHY device is different from the transmission setting of the SW device by the comparison unit, the transmission setting of the PHY device is set. To SW
It is characterized by changing the transmission settings of the device. The network device of the present invention is characterized by having setting means for controlling whether the auto negotiation function of the PHY device and the SW device is enabled or disabled.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In this figure, the same components as those in the conventional example of FIG. 3 are designated by the same reference numerals. A network device according to an embodiment of the present invention has an auto-negotiation function, and includes layers 1 (physical layer) to layer 2 (data link layer) or layers 1 to 3 (network layer) in the OSI reference model. Blocks for terminating (line termination or relay) are connected in a configuration as shown in FIG. The point that the configuration of the network device of the present invention differs from the conventional example is that
Do not allow the device 2 to monitor and change the transmission rate and transmission mode setting data of the PHY device 1 (hereinafter, the setting including these two is referred to as transmission setting), that is, SW
When the control unit 3 monitors the transmission setting of the PHY device 1 and detects that the transmission setting of the PHY device 1 has been changed, the control unit 3 does not have the auto negotiation function in the device 2 itself, and the control unit 3 detects that the SW device 2 has been changed. Set the transmission setting to P
That is, the HY device 1 is configured to change to a new transmission setting.

In other words, the network device according to the present embodiment is a network device that determines transmission settings with a connected opposite device (not shown) by using the auto negotiation function, and transmits / receives to / from the opposite device. SW having a function of controlling the PHY device 1 having a function of terminating an Ethernet (registered trademark) frame to be transmitted and transferring the Ethernet (registered trademark) frame transmitted to and received from the opposite device to another device. The device 2 is controlled, the transmission setting with the opposite device determined by the auto-negotiation function of the PHY device 1 is read from the setting register in the PHY device 1, and the read transmission setting is set as the transmission setting of the SW device 2. , Ethernet input Against over-time, PHY device 1
And the SW device 2 are made to coincide with each other in transmission setting.

Here, the priority order (IE) in which the transmission setting is determined when the auto negotiation is enabled.
The priorities specified in the EE802.3u standard are shown below. 1.100BASE-TX: full duplex (transmission data X1 in FIG. 2) 2.100BASE-T4: half duplex 3.100BASE-TX: half duplex (transmission data X3 in FIG. 2) 4.10BASE-T: full Duplex (Transmission data X2 in FIG. 2) 5.10BASE-T: Half-duplex (Transmission data X4 in FIG. 2) Here, the smaller the number, the higher the priority order selected in matching between network devices. Has become.

The purpose of auto-negotiation is to optimize the transmission settings (such as Ethernet (registered trademark) frames) when exchanging information (for example, Ethernet (registered trademark) frames) between devices having a plurality of transmission methods (the above-mentioned priority levels 1 to 5). The communication speed is 10 M / 100 Mbps and the communication mode is full duplex / half duplex), and both are automatically set. As you can see from the priorities above,
The priority is set to IEEE8 so that a higher speed transmission setting can be selected in the communication speed and the communication mode in both usable ranges between the network devices.
It is defined by the 02.3u standard.

Inside the network device, the PHY device 1 and the SW device 2 are connected by MII, and the control unit 3 and the PHY device 1 are connected by SMI. Further, the control unit 3 is connected to a control terminal for changing the transmission setting of the SW device 2, and the change control signal S1 for requesting the control terminal P to change the transmission setting and the transmission setting Is output. The control terminal P is normally used for inputting a transmission setting and a control signal for initializing the SW device 2 when the power is turned on. However, in the present invention, the SW device 2 in the auto negotiation function is used. Used to change transmission settings.

That is, in the conventional usage, for example, the transmission settings stored in the EEPROM are read out and supplied to the control terminal P when the power is turned on, and the SW device 2 is initialized. The EEPROM interface used for inputting the setting data to the control terminal P is an interface for setting the SW device 2 without external control, and the setting method is S
Although it depends on the type of the W device 2, the same applies to any type of SW used for the purpose of changing the transmission setting of the SW device 2.

In the present embodiment, the SMI is used by the control unit 3 to output an MDIO frame for controlling the transmission setting to the PHY device 1 and monitor the transmission setting of the PHY device 1. It is also used by the control unit 3 to change the transmission settings of the PHY device 1 when the auto negotiation function is disabled. Further, the SW device 2 is connected to the PHY device 1 via the SMI.
, The SW device 2 is configured not to control the transmission settings for the PHY device 1 and to monitor the transmission settings of the PHY device 1. DIPS
W.10 is a DIP switch, which is connected to the DIPSW detection unit 9 in the control unit 3 and sets whether the auto-negotiation function of the PHY device 1 and the SW device 2 is enabled or disabled, and disables the auto-negotiation function. When set, transmission settings such as communication speed and communication mode in the PHY device 1 and SW device 2 are set, and predetermined settings for the other PHY device 1 or SW device 2 are made.

The DIPSW detection unit 9 sets each data string set in the DIPSW 10 connected to the outside of the network device, that is, the valid or invalid setting of the auto negotiation function set by switching on and off, and the auto negotiation function. Transmission settings such as communication speed and communication mode when the setting is disabled, and data strings of other setting data for the PHY device 1 or the SW device 2 are respectively included in the timer unit 6, the comparison unit 8, the PHY control unit 4, and The output is output to the SW control unit 7, and when any switch of the DIPSW 10 is changed, the change is detected and notified to each of the above units. The PHY control unit 4 stores an MDI for storing a data string such as transmission settings in a setting register in the PHY device 1.
MD for reading the O-frame or the data string of the transmission setting stored in the setting register in the PHY device 1.
This is a circuit that generates an IO frame.

Here, the PHY control unit 4 uses the DIPSW.
When the auto negotiation function of the PHY device 1 is set to be invalid according to 10, when the power is turned on, DI
The MDIO frame for storing the data sequence such as the transmission setting set in the PSW-10 is generated, and the PH
Output to Y device 1. On the other hand, the PHY control unit 4 uses P
MD for reading the data string of the transmission setting stored in the setting register in the PHY device 1 when the auto-negotiation function of the HY device 1 is enabled
An IO frame is generated and output to the PHY device 1.

When the auto negotiation function is enabled, the PHY control section 4 reads the data string stored in the setting register in the PHY device 1 and outputs it to the transmission setting detection section 5. At this time, the PHY control unit 4 reads the transmission setting of the setting register in the PHY device 1 (requests the transmission setting) in synchronization with the sampling signal M1 output from the timer unit 6. At this time, the PHY device 1 outputs the transmission setting in the setting register to the PHY control unit 4 as an MDIO frame. Further, the PHY control unit 4 transfers the MDIO frame from the PHY device 1 to the transmission setting detection unit 5.

The transmission setting detection unit 5 extracts a transmission setting portion related to the transmission setting from the MDIO frame input from the PHY control unit 4 in synchronization with the sampling signal M2 output from the timer unit 6, By decoding this transmission setting, the transmission setting (communication speed and communication mode) of the PHY device 1 is detected. Further, the transmission setting detection unit 5 outputs the detected transmission setting of the PHY device 1 to the comparison unit 8 as setting data SP. Here, when the auto negotiation function is enabled, the timer unit 6 outputs the sampling signal M1 that defines the timing at which the PHY control unit 4 sends the MDIO frame requesting the transmission setting of the setting register to the PHY device 1, It is generated at regular intervals and supplied to the PHY control unit 4. Also, the timer unit 6 sends MDIO transmitted from the PHY device 1 when the auto negotiation function is enabled.
A sampling signal M2 that defines the timing for extracting the transmission setting portion of the frame is generated at regular intervals and supplied to the transmission setting detection unit 5. However, when a signal indicating that the SW device 2 is being set is received from the SW control unit, the timer unit does not generate the sampling signal M1 and the sampling signal M2.

On the other hand, when the auto-negotiation function is invalid, the timer unit 6 detects the DIPSW detection unit 9 to D
When the change of various settings of the PHY device 1 set in the IPSW-10 is notified, that is, DIPSW-1
When any one of the switches 0 is changed, the sampling signal M1 is supplied to the PHY control unit 4. At this time, P
Since the HY control unit 4 detects that the auto-negotiation is invalid and any switch of the DIPSW 10 is changed, the HY control unit 4 includes the transmission setting to be written in the setting register in the PHY device 1 by the sampling signal M1. The MDIO frame is generated and output to the PHY device 1. Further, the timer unit 6 can be configured not to supply the sampling signal M1 and the sampling signal M2 for monitoring the transmission setting of the PHY device 1 when the auto negotiation function is disabled. When monitoring the PHY device 1, the timer unit does not generate the sampling signal M1 and the sampling signal M2 when a signal indicating that the SW device 2 is being set is received from the SW control unit.

When the auto-negotiation function is valid, the comparison unit 8 is notified from the transmission setting detection unit 5 for each cycle of the sampling signal M1.
Changes in the transmission settings of are detected. That is, the comparison unit 8
The transmission setting of the PHY device 1 notified from the transmission setting detection unit 5 is internally stored for each cycle of the sampling signal M1, and the transmission setting detection unit 5 notifies the transmission setting of the PHY device 1 at the next sampling signal M1. Compare with transmission settings. Here, the comparison unit 8 stores the PHY stored therein.
When it is detected that the transmission setting of the device 1 is different from the transmission setting of the PHY device 1 notified from the transmission setting detection unit 5, it is determined that the transmission setting of the PHY device 1 has changed. When the comparison unit 8 determines that the transmission setting of the PHY device 1 has changed, the SW control unit uses the transmission setting of the PHY device 1 notified from the transmission setting detection unit 5 as the control signal CH together with the SW setting trigger pulse. Output to 7.

The SW control unit 7 has a function of controlling the transmission setting of the SW device 2, and when the auto negotiation function is effective, the SW setting trigger pulse from the comparison unit 8 is used as a trigger to set the transmission setting data. SW device 2
Write to and change (control) the transmission settings of the SW device 2. On the other hand, when the auto negotiation function is disabled, the SW control unit 7 writes the transmission setting output from the DIPSW setting unit 9 into the SW device 2 and changes (controls) the transmission setting of the SW device 2. Where SW
While the control unit 7 is writing to the SW device 2,
The timer unit 6 sends a signal that the SW device 2 is being set.
Send to. The SW device 2 can be set to enable or disable the auto negotiation function, but in the present embodiment, the auto negotiation function is always set to be disabled and used.

Further, in the above-mentioned configuration, when the auto-negotiation function is disabled, the timer section 6 is made to generate and output both the sampling signals M1 and M2, and the transmission setting of the register in the PHY device 1,
That is, by monitoring the transmission settings and comparing the transmission settings notified by the DIPSW detection unit 9 with the transmission settings of the PHY device 1 notified by the transmission settings detection unit 5, the transmission settings by the DIPSW. , If the transmission settings of the PHY device 1 do not match, it is also possible to notify the external device of the abnormality of the network device.

With the configuration of the network device of the present invention described above, the SW device 2 does not access the PHY device 1 by using the SMI, and the SW controller 7 controls the communication speed and communication mode of the SW device 2. Therefore, it is possible to prevent malfunction of the PHY device 1 and the SW device 2 without collision of MDIO frames of the control unit 3 and the SW device 2 in the SMI.
It is possible to realize a stable auto negotiation function. However, since the method of setting the transmission setting and the like differs depending on the SW, it is necessary to set the transmission setting of the SW control unit 7 by a method corresponding to the use of each SW.

Next, an operation example of the network device according to this embodiment will be described with reference to FIGS. FIG. 2 is a timing chart showing an operation example of the control unit 3 based on the sampling signals M1 and M2 output from the timer unit 6. Here, a case will be described in which the auto negotiation function of the network device is enabled in the DIPSW-10. In FIG. 2, for example, the transmission data X1 of the transmission setting is 100BASE-TX: full duplex, the transmission data X2 is 10BASE-T: full duplex, the transmission data X3 is 100BASE-TX: half duplex, the transmission data X4 is 10BASE-T: Half duplex. The DIPSW-10 sets the auto-negotiation function of the network device to valid and turns on the power of the network device. Then, when the power is turned on, the DIPSW detection unit 9
In the IPSW 10, the setting that the auto negotiation function is valid is detected, and the detected setting is notified to the PHY control unit 4, the timer unit 6, the comparison unit 8, and the SW control unit 7.

Next, when the PHY control unit 4 receives the notification that the auto-negotiation function is valid from the DIPSW detection unit 9, it generates an MDIO frame including a data string that enables the auto-negotiation function of the PHY device 1. , To the PHY device 1. Then, in the PHY device 1, the auto-negotiation function is enabled by writing the data string in the internal setting register. Thereby, the PHY device 1 performs auto-negotiation with the opposite device and sets transmission settings such as communication speed and communication mode.

At this time, the timer section 6 uses the sampling signal M1 as the timing for transmitting the MDIO frame.
Are always generated at regular intervals. The timer unit 6 supplies the generated sampling signal M1 to the PHY control unit 4 (time t1). As a result, the PHY control unit 4 synchronizes with the sampling signal M1 from the timer unit 6 in the MD.
An IO frame is generated and transmitted to the PHY device 1 (time t2).

Here, the MDIO frame is PHY.
This is an MDIO frame for reading a register that stores completion data indicating the completion state of the auto-negotiation operation of the device 1 and a data string indicating the communication speed and communication mode determined by this auto-negotiation operation. The completion data indicates that the PHY device 1 is in negotiation (not completed).
Indicates either the state or the state where negotiation has been completed. The PHY device 1 is the MD
When the IO frame is received, the MDIO frame including the data string of the transmission setting of the setting register and the data indicating the completion of the negotiation operation is output.

Next, the PHY control unit 4 transfers the data string of the MDIO frame notified from the PHY device 1 to the transmission setting detection unit 5. Then, the transmission setting detection unit 5
Is a completion state of the auto-negotiation operation of the PHY device 1 from the MDIO frame notified from the PHY control unit 4 in synchronization with the sampling signal M2 notified from the timer unit 6, and a transmission setting determined by the auto-negotiation operation ( Communication speed and communication mode) are extracted (time t3). At this time, the transmission setting detection unit 5
When the auto-negotiation operation extracted from the MDIO frame is complete, the notification unit notifies the comparison unit 8 of the communication speed and communication mode extracted from the MDIO frame in synchronization with the falling of the sampling signal M2 (time t4).

At this time, the comparison unit 8 changes the setting data because the transmission setting stored therein is the setting data X1 and the transmission setting input from the transmission setting detecting unit 5 is the setting data X1. If there is none, the control signal CH is not output to the SW control unit 7. After that, the network device performs the same operation from time t5 to time t7, from time t9 to time t11, and from time t13 to time t15 as from time t1 to time t3 described above.

On the other hand, when it is detected that the auto negotiation operation is not completed in the MDIO frame transferred from the PHY control unit 4, the transmission setting detection unit 5 compares the communication speed and communication mode extracted from the MDIO frame with the comparison unit. 8 is not notified (time t8, time t1
2). In addition, the transmission setting detection unit 5 detects the completion of the auto-negotiation operation in the MDIO frame transferred from the PHY control unit 4, and then detects the MDI.
The comparison unit 8 is notified of the communication speed and communication mode (setting data X4) extracted from the O frame (time t16).

Then, the comparison unit 8 determines that the transmission setting of the PHY device 1 has changed because the stored setting data X1 of the transmission setting is different from the setting data X4 input from the transmission setting detection unit 5. , The setting data X4 of the transmission setting of the PHY device 1 notified from the transmission setting detection unit 5
Is output to the SW control unit 7 as the control signal CH together with the SW setting trigger pulse (time t17). As a result, the SW control unit 7 writes the setting data X4 in the SW device 2 in synchronization with the SW setting trigger pulse,
The communication speed and communication mode from the setting data X1 to the setting data X4 are changed. As a result, the control unit 3 matches the transmission settings of the PHY device 1 and the SW device 2 without causing signal interference with the PHY device 1 and the SW device 2.

With the above flow, the control unit 3 sets the P when the auto-negotiation function is in the valid setting state.
When the transmission setting of the HY device 1 changes, the changed transmission setting detected from the PHY device 1 is changed to the SW device 2
To match the setting data of the transmission settings of the PHY device 1 and the SW device 2. As a result, in the network device of the present invention, since the SW device 2 does not read the register in the PHY device 1, the MDIO frame that controls the PHY device 1 by the control unit 3 collides with the MDIO frame from the SW device 2. It is possible to prevent the PHY device 1 and the SW device 2 from malfunctioning due to the above-mentioned collision.
Auto negotiation between the device 1 and the SW device 2 can be stably performed.

Further, the comparing section 8 has a function of storing the communication speed and the communication mode previously set for the PHY device 1. However, the setting for the PHY device 1 is made when the power is turned on. The communication speed and communication mode (transmission setting) are not stored because they have not been performed. Therefore, when the communication setting and the communication mode are notified from the transmission setting detection unit 5 when the power is turned on, the comparison unit 8 notifies the SW control unit 7 of the notified transmission setting as it is along with the SW setting trigger pulse (control). Output the signal CH).

Next, the SW control unit 7 notifies the SW device 2 of the setting data of the transmission setting notified from the comparison unit 8 by using the SW setting trigger pulse as a trigger, and the setting data of the transmission setting of the SW device 2 is transmitted. Make settings. At this time (when the power is turned on), the SW control unit 7 simultaneously sets the auto negotiation function of the SW device 2 to be invalid. In this way, the SW device 2 prevents the PHY device 1 from accessing the PHY device 1 by using the SMI, and is synchronized with the SW setting trigger pulse from the SW control unit 7. This is for validating the settings of the communication speed and the communication mode.

Next, the operation when the power is turned on with the auto negotiation function of the network device disabled is described. In the DIPSW-10, the switch is set so as to disable the auto negotiation function of the network device, and the power of the network device is turned on. When the power is turned on, the DIPSW detection unit 9 sets the DIPSW-10 to disable the auto negotiation function, the transmission settings of the network device,
For example, the setting data is "X3 (100BASE-TX:
Half-duplex) ". At this time,
When the DIPSW detection unit 9 detects that the auto-negotiation function is invalid and the setting X3, the DIPSW detection unit 9 outputs the data indicating that the detected auto-negotiation function is invalid and the setting data to the PHY control unit 4, the timer unit 6, and the timer unit 6, respectively. The comparison unit 8 and the SW control unit 7 are notified.

Next, when the PHY control unit 4 receives the notification from the DIPSW detection unit 9 that the auto negotiation function is disabled and the notification that the PHY device 1 is set in the setting data X3, they are set. To generate an MDIO frame for output to the PHY device 1. As a result, the PHY device 1 stores the data string of the setting data X3 of the MDIO frame in the internal setting register, thereby disabling the auto negotiation function and setting the transmission setting to 100 BAS.
E-TX, half duplex is set.

At the same time, the SW control unit 7 causes the DIPS
When receiving the notification from the W detection unit 9 that the auto negotiation function is disabled, the setting data X3 notified from the DIPSW detection unit 9 is notified to the SW device 2, and the communication speed and communication mode of the SW device 2 are set to 100.
BASE-TX, set to half duplex. At this time, the SW control unit 7 disables the auto negotiation function of the SW device 2. With the above flow, DIP
The communication speed and communication mode set by the SW-10 are set in the PHY device 1 and the SW device 2,
Match the transmission settings of the PHY device 1 and the SW device 2.

When the auto negotiation function is disabled, the PHY device 1 is
Transmission settings set by W.10, for example, 100BA
SE-TX: When confirming whether or not half duplex is set, the PHY control unit 4 synchronizes with the sampling signal M1 notified from the timer unit 6 as in the case where the auto negotiation function is enabled. MDIO frame to P
The transmission setting detection unit 5 may detect the transmission setting of the PHY device 1 by transmitting it to the HY device 1 and reading the setting data stored in the setting register in the PHY device 1. Further, the timer unit 6 sends a notification that the setting register in the PHY device 1 is monitored to the DIPS.
When received from the W detector 9 (when set by the switch of the DIPSW 10), the sampling signals M1 and M2 are received.
On the other hand, when the notification that the setting register in the PHY device 1 is not monitored is generated, the sampling signal M
Do not generate 1 and M2.

Further, when the comparing section 8 receives a notification from the DIPSW detecting section 9 (when it is set by the switch of the DIPSW.multidot.10) that the setting register in the PHY device 1 is monitored, the comparing section 8 sends a notification from the DIPSW detecting section 9. The transmission setting set by the DIPSW 10 that is set, for example, the transmission setting of the transmission data X3 and the transmission setting of the PHY device 1 notified from the transmission setting detection unit 5 are compared, and if they are different, the network device It may be determined that there is an abnormality in the device, an alarm is issued, and an LED or the like is developed to notify the outside that the PHY device 1 is not set according to the setting of the DIPSW 10. However, unlike the case where the auto negotiation function is valid, the comparison unit 8 does not notify the SW control unit 7 of the transmission setting.

Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes within the scope not departing from the gist of the present invention. Even so, it is included in the present invention.

[0052]

In the network device of the present invention, since the SW device does not read the register in the PHY device, the MDIO frame for controlling the PHY device by the negotiation control unit collides with the MDIO frame from the SW device. It is possible to prevent the PHY device and the SW device from malfunctioning due to this collision, and to prevent the PHY device and the SW device from being affected by the communication speed and communication mode of the input Ethernet (registered trademark) frame. It is possible to perform stable auto negotiation between the two.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a network device according to an embodiment of the present invention.

FIG. 2 is a sampling signal M output by a timer unit 6.
3 is a timing chart showing an operation example of the control unit 3 based on 1 and M2.

FIG. 3 is a block diagram showing a configuration of a network device according to a conventional example.

[Explanation of symbols]

1 PHY device 2 SW device 3 control unit 4 PHY control unit 5 Transmission setting detector 6 timer section 7 SW control section 8 comparison section 9 DIPSW detector 10 DIPSW

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shoko Fujioka             2081-28 Tahara, Mashiki-machi, Kamimashiki-gun, Kumamoto             Kyushu Ando Electric Co., Ltd. (72) Inventor Kanji Tatsumi             529-3 Kamata, Ota-ku, Tokyo Andoden             Ki Co., Ltd. F term (reference) 5K033 AA05 CB01 DA15 DB12 DB17                       DB18 EC01 EC04                 5K034 AA05 AA19 DD01 LL01 MM08                       MM39 NN12 NN22

Claims (9)

[Claims] 1. A network device for matching transmission settings including a communication speed and a communication mode with the opposite device by auto-negotiation with the connected opposite device. A transfer that transfers a frame transmitted / received between the PHY control unit that has a PHY device having a function of terminating a transmitted / received frame and reads out the transmission setting set in this PHY device and the opposite device to another device The SW control unit for controlling the SW device having a processing function, and the transmission setting of the PHY device read by the PHY control unit and set by the auto negotiation function together with the opposite device A network device, comprising: a negotiation control unit that matches transmission settings. 2. The network device according to claim 1, wherein the PHY control unit enables or disables the auto-negotiation function of the PHY device, and sets the transmission setting of the PHY device when the function is disabled. 3. The network device according to claim 1, wherein the PHY control unit has a function of detecting the transmission setting of the PHY device at predetermined intervals. 4. The network device according to claim 3, wherein the PHY control unit has a timer that outputs a sampling signal for detecting the transmission setting of the PHY device at regular intervals. 5. The PHY control unit includes a detection unit that performs a detection process of whether or not a transmission setting of a PHY device has changed at each sampling interval. Network equipment. 6. The SW control unit sets a transmission setting of a PHY device detected by the PHY control unit as a transmission setting of the SW device.
To the network device according to claim 5. 7. The network device according to claim 6, wherein the PHY control unit includes a comparison unit that compares the transmission setting of the PHY device and the transmission setting of the SW device. 8. The SW control unit causes the comparison unit to
The transmission setting of the SW device is changed to the transmission setting of the PHY device when it is detected that the communication speed and communication mode of the PHY device are different from the transmission setting of the SW device. The network device according to 1. 9. The network apparatus according to claim 1, further comprising a setting unit that controls whether the auto negotiation function of the PHY device and the SW device is enabled or disabled.