JPH07109595B2 - LAN adapter control method - Google Patents

Description

DETAILED DESCRIPTION [Overview] An input / output bus control unit that controls a connection between an input / output bus and an internal bus, and a LAN control that controls a connection between a LAN transmission line and an internal bus Section and a data transfer control section that controls the transfer of data between the internal bus and memory, and a LAN adapter control method that controls the connection between the transmission path and the input / output bus. The purpose is to provide a LAN adapter control method that can transfer data, and when the internal bus occupation requests from the I / O bus control unit and LAN control unit compete, the request from the LAN control unit is given priority. A bus possession right adjusting unit that gives an instruction to the data transfer control unit and an interrupt processing unit that prioritizes the request from the input / output bus control unit when the interrupt requests conflict with each other.

[Industrial application field]

The present invention relates to a control method for a LAN adapter, and more particularly, to an input / output bus control unit that controls a connection between the input / output bus and an internal bus by interposing a LAN transmission path between the input / output bus and the input / output bus. ,
A LAN control unit that controls the connection between the transmission path and the internal bus, an interrupt processing unit, and a data transfer control unit that controls the transfer of data between the internal bus and the memory. And a LAN adapter control method for controlling the connection between the input / output bus and the input / output bus.

Here, a LAN (Local Area Network) refers to a network system that is laid in a limited area such as a site of a user's premises and that enables independent devices to be connected to each other for communication.

[Conventional technology]

Conventionally, as shown in FIG. 4, in a line adapter close to the LAN adapter control system, the line adapter is interposed between the line 49 and the input / output bus 48, and
The IOBC (I / O Bu) that controls the connection between the 48 and the internal bus 47.
s Controler input / output bus control unit) 41, LANC (LAN Controler LAN control unit) 42 that controls connection between line 49 and internal bus 47, interrupt processing unit 43, DMA transfer unit 44, and internal bus 47. A data transfer control unit 44 for controlling data transfer with the memory 46, and the line 49 and the input / output bus.
It controls the connection with 48. Regarding input / output, 48 is connected to the host processor.

Conventionally, the data transfer between the input / output buses 48 is carried out by the DMA transfer unit 44, but the data reception from the line is not carried out by the DMA operation but is carried out on the CCU by interruption of each character. Interrupt processing program.

[Problems to be Solved by the Invention]

By the way, even when making a LAN adapter using a CCU, the LAN controller 42
If the priority is given to the side and the execution level of the interrupt program is also prioritized, if the frame reception continues due to the promiscuous mode (mode that receives all the frames placed on the transmission line), the host processor for LAN control There was a problem that instructions and DMA transfer to memory could not be performed.

Therefore, the present invention has been made for the purpose of providing a LAN adapter control system capable of smoothly transferring data.

[Means for Solving the Problems]

In order to solve the above technical problems, the present invention is, as shown in FIG. 1, an input / output bus control unit 1 for controlling the connection between the input / output bus 8 and an internal bus 7, and a LAN transmission line 9. LAN control unit 2 for controlling the connection between the internal bus 7 and the internal bus 7, and a data transfer control unit 4 for controlling the transfer of data between the internal memory 7 and the memory 6, and a LAN transmission line. In the LAN adapter control method for controlling the connection between the I / O bus 9 and the I / O bus 8, if the I / O bus control unit 1 and the LAN control unit 2 occupy the occupancy requests of the internal bus 7, the LAN control unit 2 Which has a bus occupation right adjusting unit 5 for giving an instruction to prioritize a request from the data transfer control unit 4 and an interrupt processing unit 3 for prioritizing a request from the I / O bus control unit 1 when the interrupt requests conflict with each other. Is.

Here, the "internal bus" is a bus in the LAN adapter, and is, for example, a CCU (Central Controller Unit) bus in the communication control device as shown in the embodiment.

[Action]

When there is a data transfer request from the LAN control unit 2 and the input / output bus control unit 1, the bus occupation right adjusting unit 5 gives priority to the data transfer request from the LAN control unit 2 and transfers the data. The controller 4 is instructed to do so.

On the other hand, when the interrupt request from the input / output control unit 1 and the interrupt request from the LAN control unit 2 compete with each other, the interrupt processing unit 3 gives priority to the request from the input / output bus control unit 1. .

This is because the LAN controller is often operated in promiscuous mode for frame reception, so it is necessary to give priority to data transfer, but it is necessary to give priority to the instruction from the host etc. for the program to be executed. is there.

〔Example〕

 Next, examples of the present invention will be described.

FIG. 2 shows a LAN adapter according to the embodiment.

The LAN adapter 10 is connected to the host processor 30 via the input / output bus 18, and is connected to another input / output device or the like via LAN.
Are connected via the transmission line 19 of FIG.

The LAN adapter 10 includes an input / output control unit 11 that controls the connection between the input / output bus 18 and the internal bus 17, a LAN controller 12 that controls the connection between the transmission path 19 and the internal bus 17, and a LAN.
When the data transfer requests of the controller 12 side and the input / output bus control unit 11 side compete with each other, the bus occupancy right adjusting unit 15 and the CCU (Central Control Unit)
troller unit) 20 and a memory 6.

The CCU 20 transfers data to and from the data transfer control unit 14 and the interrupt processing unit 13 by cycle stealing (transferring data between an input / output device and a storage device by using a gap between processor devices). It is equivalent.

Further, the bus occupation right adjusting unit 15 has an AND circuit 15a and an OR circuit 15b, as shown in FIG.

The present embodiment operates as follows.

When there is a request signal (“1”) for data transfer from the LAN controller 12 to the memory 16 or data transfer from the memory 16, the signal is supplied to the OR element 15b of the bus occupation right adjusting unit 15. The CCU 20 is notified via this, and the “0” signal is input to the terminal of the AND element 15a of the bus occupation right adjusting unit 15.

Therefore, when the permission signal “1” for the request signal is output from the CCU 20, the permission signal is directly output to the LAN controller 12.

On the other hand, even when there is a data transfer request from the IOBC 11, the request signal is sent to the CCU 20 and the bus occupation right adjusting unit 1
The CCU 20 is notified via the OR terminal 15b of 5 and outputs the permission signal.

However, if data transfer requests from the IOBC 11 and LAN controller 12 conflict, one terminal of the AND element
Since the inverted signal "0" of the request signal "1" from the AN controller 12 is input, the permission signal to the IOBC11 is not output.

On the other hand, from the LAN controller 12 side and the IOBC11 side to the CCU20
When the interrupt signals to the interrupt processing unit 13 of
The interrupt level from the IOBC11 side is the LAN controller 12
Since it is higher than the interrupt level from the side, the interrupt processing from the IOBC11 side will be executed with priority.

In the present embodiment, the data transfer control unit 14
The case of performing data transfer by stealing (Cycle Stealing) has been described, but the present invention is not limited to this example.
The data may be transferred by a DMA controller provided separately from the CCU 20.

As described above, in this embodiment, the bus occupancy right can be adjusted with a simple configuration using AND elements and OR elements.

〔The invention's effect〕

As described above, in the present invention, when the data transfer requests from the input / output control unit and the LAN control unit compete with each other, the data transfer request from the LAN control unit is prioritized, but the input / output control unit and the LAN control unit When there is an interrupt request from the I / O controller, the interrupt request from the input / output control unit is prioritized.

Therefore, it is possible to deal with the data transmission in the promiscuous mode by the LAN control unit, and to give priority to the interrupt processing from the host device by the input / output control unit.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment, FIG. 3 is a diagram showing a bus occupation right adjusting unit of the embodiment, and FIG. 4 is a block diagram of a conventional example. Is. 1 (11) …… Input / output bus control unit (IOBC) 2 (12) …… LAN control unit (LAN controller) 3,13 …… Interrupt processing unit 4,14 …… Data transfer control unit 5,15 …… Bus Occupancy right adjustment unit 6 …… Memory 7 …… Internal bus 8 …… I / O bus 9 …… LAN transmission path

Claims (1)

[Claims] 1. An input / output bus control unit (1) for controlling a connection between an input / output bus (8) and an internal bus (7), a LAN transmission line (9) and an internal bus (7). LAN control unit (2) for controlling connection between the two, internal bus (7) and memory (6)
In a LAN adapter control system that has a data transfer control unit (4) that controls the transfer of data to and from, and that controls the connection between the transmission path (9) and the input / output bus (8), When the internal bus (7) occupancy requests from the input / output bus control unit (1) and the LAN control unit (2) compete with each other, an instruction to prioritize the request from the LAN control unit (2) is issued. LAN having a bus occupation right adjusting unit (5) for performing 4) and an interrupt processing unit (3) for prioritizing a request from the input / output bus control unit (1) when the interrupt requests conflict with each other. Control method of the adapter.