JPH0728299B2 - Status transfer control method and packet transfer device - Google Patents

Description

The present invention relates to a status transfer control method and a packet transfer device in a packet transfer device of a bus type packet switching device.

[Conventional technology]

In this type of conventional status transfer control method, the status information request source packet transfer device issues a bus acquisition request to the bus arbiter to acquire the transmission right to the bus, and then sends a status information return request to the status information request destination packet. When the transfer device is given abandonment of the bus use right (bus release), the request destination packet transfer device generates status information in response to the status request by software processing or hardware processing, and sends a request to the bus arbiter to send the bus. When the right can be acquired, the status of the own packet transfer device is transmitted to the requesting packet transfer device.

[Problems to be Solved by the Invention]

In the conventional status transfer control method described above, when the status information request packet and the status information response packet (status information packet to be sent to the request source) are transmitted, the packet arbiter must be transmitted to the bus arbiter when each packet transfer device transfers the packet data. In this system, the bus acquisition request is made, and the packet is transmitted after the transmission right is acquired. Therefore, the time required from the status request to the reception of the status response is not constant depending on the traffic state of the bus. For this reason, there is a drawback that the real-time property is lost in performing maintenance and status management of each device connected to the bus.

[Means for Solving the Problems]

A status transfer control method of the first invention is a bus type transmission line with an m-bit width, a bus arbiter that arbitrates the transmission right for a plurality of transmission requests, and a transmission request is issued from the bus arbiter by issuing a transmission request to the bus arbiter. By at least 2
In a packet switching device configured with a packet transfer device for performing packet transfer between a plurality of 1-to-n (n ≧ 1) devices, status information indicating an operation status of the packet transfer device is transferred to a packet transfer device other than the own packet transfer device. A status transfer control method for transferring status information from a status request destination packet transfer apparatus to a status request source packet transfer apparatus by making a request to the apparatus, wherein the bus arbiter is provided from the status information request until the status information is received. Transmission request holding means for holding a transmission request to the other device, status request packet transfer means for transferring a status request packet to the partner device, status information generation means for generating and accumulating status information of the own packet transfer device, and status When a request packet is received The status information request source is provided with status response packet transfer means for automatically transferring status information to the request source device without making a transmission request to the arbiter. The packet transfer device receives the status information transmitted by the request destination packet transfer device in a state where the transmission right from the bus arbiter is acquired. The packet transfer device of the second invention is m
A bus type transmission line with a bit width, a bus arbiter that arbitrates the transmission right for a plurality of transmission requests, and a transmission request from this bus arbiter, and at least two 1-to-n (n ≧ 1) by transmission permission from the bus arbiter. ) In a packet switching device configured with a packet transfer device for performing packet transfer between devices, the bus arbiter between requesting status information indicating an operation status of the packet transfer device from a partner device and receiving the status information. A transmission request holding unit that holds a transmission request to the partner device, a status request packet transfer unit that transfers a status request packet to the partner device, a status information generation unit that generates and stores status information of the own packet transfer device, When the status request packet is received, a transmission request is sent to the bus arbiter. It is characterized by comprising: a status response packet transfer unit status information without I automatically transferred to the status requesting a packet transfer device, and a status information storage unit for storing the received status information.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention in which a packet transfer device 1 and a packet transfer device 2 arbitrate a transmission request from each packet transfer device and give a transmission right to a bus arbiter 3 by an arbiter bus 4. The packet transfer device that is connected and has acquired the transmission right can transfer data to the destination packet transfer device through the packet bus 5.

FIG. 2 is a block diagram showing an example of the packet transfer device in FIG. 1, in which the packet transfer device 10 requests the status information from the partner device until the status information is received from the bus arbiter 3 (see FIG. 1). A transmission request holding unit 101 that holds a transmission request for the packet bus 5
Via the status request packet transfer unit 102 for transferring the status request packet to the partner device, the status information generation unit 103 for generating and accumulating the status information of the own packet transfer device, and the bus arbiter 3 when the status request packet is received. A status response packet transfer unit 104 that automatically transfers status information to the status request source packet transfer device without making a transmission request,
A status information storage unit 105 that stores the received status information and a timer 106 that monitors a data transmission / reception operation are provided.

FIG. 3 is a diagram showing a status transfer control sequence in the embodiment shown in FIG.

Next, the operation of this embodiment will be described with reference to FIGS.

The packet transfer device 1 makes a transmission request to the bus arbiter 3 via the arbiter bus 4. As a result, when the transmission right is given, a status information request packet is sent from the status request packet transfer unit 102 via the packet bus 5 to the packet transfer device. 2 until the status information response packet from the packet transfer device 2 is received, the transmission request is held in the transmission request holding unit 101 and the transmission right is not released. When the status information request packet is received, the packet transfer device 2 extracts the status request packet transmission source address, and since the packet transfer device 1 of the status information request source is capturing the packet bus 5, the transmission request is sent to the bus arbiter 3. Instead, the status information generation unit 103 in the own device 2 transmits the status information of the own device set by software processing or hardware processing from the status response packet transfer unit 104 to the packet transfer device 1 as a status information response packet, In the packet transfer device 1, the status information is stored in the status information storage unit 105. In the packet transfer device 1 of the status information request source, when the status information response packet is received, the transmission request holding unit 101
To cancel the transmission request to the bus arbiter 3 and release the packet bus 5. It should be noted that the timer 106 monitors the data transmission / reception operation, so that it is possible to avoid a stack of operations due to a failure during status transfer control.

〔The invention's effect〕

As described above, the present invention transfers the status response when the status information request packet and the status information response packet are transmitted during the status transfer control in the situation where the status information request source captures the bus.
Since the transmission right is not acquired for each packet transfer, the status information of the request destination packet transfer device can be recognized when the status is requested without depending on the traffic of the packet bus. Therefore, the time required for maintenance and status management of the packet bus and the packet transfer device can be shortened. Further, when the bus is captured for each packet transfer, the status information response is not always received in the requested order, so the source address of the reception status information must be recognized by software processing. Since the status information response packet can be received at times, this process is unnecessary, and the load of software processing can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of the packet transfer device in FIG. 1, and FIG. 3 is a status transfer control in the embodiment shown in FIG. It is a figure which shows a sequence. 1,2 ...... Packet transfer device, 3 ...... Bus arbiter, 4 ...
... arbiter bus, 5 ... packet bus, 101 ... transmission request holding unit, 102 ... status request packet transfer unit, 103
...... Status information generation unit, 104 ...... Status response packet transfer unit, 105 ...... Status information storage unit, 106 ......
Timer.

Claims (2)

[Claims] 1. A bus type transmission line having an m-bit width, a bus arbiter that arbitrates the transmission right for a plurality of transmission requests, and a transmission request to the bus arbiter, and at least two ones are permitted by the transmission permission from the bus arbiter. In a packet switching device configured with a packet transfer device for performing packet transfer between a pair of devices (n ≧ 1), requesting status information indicating the operation status of the packet transfer device to a packet transfer device other than the own packet transfer device. A status transfer control method for transferring status information from the status request destination packet transfer apparatus to the status request source packet transfer apparatus by performing the transmission request to the bus arbiter from the status information request until the status information is received. To hold the transmission request and the status of the other device A status request packet transferring means for transferring the determined packet, a status information generating means for accumulating and generates status information of the packet transfer device,
When a status request packet is received, a status response packet transfer means for automatically transferring status information to the request source device without making a transmission request to the bus arbiter, and a status information storage means for accumulating the received status information. A status transfer control method, wherein the status information request source packet transfer device receives the status information transmitted by the request destination packet transfer device in a state where the transmission right from the bus arbiter is acquired. 2. A bus type transmission line having an m-bit width, a bus arbiter that arbitrates the transmission right for a plurality of transmission requests, and a transmission request from the bus arbiter, and at least two 1s are permitted by the transmission permission from the bus arbiter. In a packet switching device configured with a packet transfer device for performing packet transfer between a pair of devices (n ≧ 1), the status information indicating the operation status of the packet transfer device is requested from the partner device and then the status information is received. Until then, a transmission request holding unit that holds a transmission request for the bus arbiter, a status request packet transfer unit that transfers a status request packet to the partner device, and status information of its own packet transfer device are generated and stored. The status information generator and the bus arbiter are paired with each other when the status request packet is received. Packet including a status response packet transfer unit that automatically transfers status information to the status request source packet transfer device without making a transmission request, and a status information storage unit that stores the received status information. Transfer device.