JPH01214951A - System for mounting lsi for communication on communication control equipment - Google Patents

Abstract

PURPOSE:To eliminate the limit of the mounting number of LSI for communication on a communication control equipment by preparing a status area for reporting operation to each group after dividing a required number of LSI for communication into plural groups. CONSTITUTION:LSI for communication of a number of <=2N are assigned to each of plural groups 4 and 5 by setting the maximum mounting number at 2N and, at the same time, a status area 7 is provided on each group 4 and 5. For each group 4 and 5, N-bit peculiar identification numbers which can be used only in each group are assigned to the LSIs for communication constituting respective groups 4 and 5, but, since the LSIs make access to only the status areas 7 prepared for respective groups 4 and 5, LSIs for communication of a number of >2N can be mounted on the communication control equipment. Therefore, the limit of the mounting number of LSIs for communication on the communication control equipment is eliminated.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a method for increasing the number of communication LSIs mounted in a communication control device even when the number of communication LSIs increases as the number of accommodated lines increases. Communication LSI with no restrictions added
The present invention relates to an implementation method for a communication control device.

[Conventional technology]

CCITT Recommendation X, 25 used for communication control equipment, etc.
An example of a communication LSI that supports Level 2 is described in the document "Study of VLSI for Communication Control" (IEICE technical research report IN82-53 (1983)). As described in the literature, the operation of a communication control device using this communication LSI includes an access area for startup, that is, a command word area, and a status area for reporting in the main memory inside the communication control device. When the communication LSI operates, it operates according to the contents written in advance in the command word area, and the operation is reported after the communication LSI writes the completion result contents to the status area. This is done by interrupting the central processing unit (CP) inside the control device. Note that the command word area is usually prepared for each LSI, and the status area is narrowed down to one in order to share the interrupt processing of the CP.

Now, it is necessary to install a plurality of communication LSIs in one communication control device according to the number of lines accommodated, but each of these LSIs is usually assigned an N-bit unique identification number (LSI identification number). Individual communication LSIs are identified.

By the way, the number of communication LSIs that can be implemented in a communication control device is 2 to the N power, and for example, when N=8, the maximum number is 256.
It is possible to mount several communication LSIs.

[Problem to be solved by the invention]

However, with the recent development of LSI technology, high-speed C
If P appears and the maximum number of implementations is 256, then 257
If it is necessary to mount more than one communication LSI, there are problems such as the need to prepare a new communication control device.

An object of the present invention is to provide a method for mounting communication LSIs on a communication control device in which the number of communication LSIs mounted on the communication control device is not limited in any way.

[Means to solve the problem]

The above objective is achieved by dividing the required communication LSIs into multiple groups, with the communication LSIs with the maximum number of implementations being less than one group, and by preparing a status area for operation reporting for each group. Ru.

[Effect]

Assuming the maximum number of implementations to be 2N, communication LSIs of 21 or less are allocated to each of a plurality of groups, while a status area is provided corresponding to each group. In any group, each communication LSI that makes up the group is assigned an N-bit unique identification number that is valid only within that group, but these communication LSIs are assigned a status area prepared for that group. Since only 28 communication LSIs are accessed, more than 28 communication LSIs can be installed in the communication control device.

〔Example〕

The present invention will be explained below with reference to the accompanying drawings.

The figure shows a block configuration of an example of a communication control device according to the present invention. According to this, the communication control device 1 has a central processing section 2. Main memory 3, first communication LSI group 4
and a second communication LSI group 5, and the main memory 3 further includes operation report status areas 7□ and 72, which the communication LSI groups 4 and 5 access with unique addresses assigned in advance to their own groups, respectively. A command word area 6 is set, which is accessed by each of the communication LSIs constituting the communication LSI group 4.5 using a unique address assigned to the communication LSI in advance.

Now, each of the communication LSIs making up the communication LSI group 4 accesses the command word area 6 using its unique address and decodes its contents.

It performs operations such as transmission and reception, but when the operation is completed, a report of the operation is written to the status area 7□ with a fixed address assigned to the communication LSI group 4, and then an interrupt is sent to the central processing unit 2. It has become. The above situation is the same in the communication LSI group 5, except that an operation report is written in the status area 7□.

When the central processing unit 2 receives an interrupt from either of the communication LSI groups 4 and 5, it can check the contents of the status area 71.7□ to determine what kind of content has been reported by either communication LSI. It lets you know how warm it is. For example, assuming that status areas 7□ and 7□ each consist of two words, and the communication LSI identification number and operation report contents are written in each of the two words, the contents of the status area are cleared every time the contents are checked. If you want to keep it.

By knowing that some data has been written, it is possible to know from which communication LSI group the interrupt occurred, and furthermore, from the communication LSI identification number, it is possible to know from which communication LSI within that group the report was made. .

As described above, even if the same LSI identification number is used for multiple communication LSI groups, when an interrupt occurs, it is determined which LSI belongs to which group depending on the status area set for each group. This means that it is possible to identify whether

〔Effect of the invention〕

As explained above, according to the present invention, there is an effect that the number of communication LSIs mounted on a communication control device is not limited in any way.

[Brief explanation of the drawing]

The figure is a diagram showing a block configuration of an example of a communication control device according to the present invention. 1... Communication control device, 2... Central processing unit, 3...
Main memory, 4, 5...Communication LSI group, 6...Command word area, 7 (7□, 7□)...Status area.

Claims (1)

[Claims] 1. CCITT Recommendation X. A method for mounting multiple communication LSIs in a communication control device that supports 25 Level 2, where the maximum number of implementations is regulated by an N-bit LSI identification number.
The number of communication LSIs equal to or less than ^N is set as one group, and the required large number (>2^N) of communication LSIs are divided into multiple groups, and a memory access area for operation reporting is set for each group. A method for mounting a communication LSI in a communication control device, characterized in that: