JPS61141021A - Setting system for machine cycle information - Google Patents

Abstract

PURPOSE:To minimize the change degree of design of the machine cycle information by setting spare information after invalidating the information in a system clock generator in case the new machine cycle value is added after design of the machine cycle information. CONSTITUTION:This information processing system comprises a system controller 1, a system clock generator 2 and processors 3 and 4 and can work on two types of machine cycle value. The generator 2 supplies the system clock signal 20 which is common with both processors 3 and 4. At the same time, the display bits 15-17 of the system clock display information 14 are set in response to the clock signal 20. The controller 1 includes a machine cycle information control table 8 and a spare machine cycle information 5 which is rewritable. The processors 3 and 4 work based on the contents of registers 18 and 19. Then the new machine cycle value if added is written to the spare machine cycle information 6 and 7, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an information processing system in which machine cycle information is set in a plurality of processing devices.

This patent relates to a machine cycle information setting method suitable for an information processing system in which a plurality of types of values can be set as the machine cycle value.

[Background of the Invention] As a method for adding a new machine cycle peak, there is a method of obtaining a specific system clock from system clocks in multiple modes using selection information, for example, as described in Japanese Patent Application Laid-Open No. 55-20558. be.

However, no consideration was given to the means of transmitting the machine pulse information corresponding to this selection information to the equipment to which the system clock is supplied, the ease of change for adding machine cycle values, and the suppression of the amount of change. .

[Purpose of the invention]

An object of the present invention is to provide an information processing system with a margin in advance for machine cycle values that can be operated, and which is designed on the assumption that it will be operated with a plurality of types of machine cycle values.

The purpose of the present invention is to provide a means for minimizing the amount of change when adding a machine cycle value different from the initial design value.

[Summary of the invention]

The present invention uses the machine cycle information in the system clock generation device as valid for the machine cycle value specified at the beginning of design, and when a new machine cycle value is added, the machine cycle information in the system clock generation device is used. In this method, machine cycle information is set in the processing device by using rewritable spare machine cycle information in the system control device instead of invalidating it.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1 and Table 1.

s1!1 diagram shows the system control device 1. System clock generator 2. 1 shows a block configuration of an information processing system configured with two processing devices 3 and 4 and designed to be operable with two types of machine cycle values, XnS and YnS. The system clock generation device 2 supplies a common system clock signal 20 to the processing devices 3 and 4, and sets display bits 15 to 17 of the system clock display information 14 according to the value of the system clock as shown in table @1. has been done.

Table 1 The system control device 1 has a machine cycle information conversion table 8 consisting of machine cycle information 9 to 12 corresponding to machine cycles of XnS and YnS, and a machine cycle information conversion table 8 of machine cycle information 9 to 12 corresponding to machine cycles of XnS and YnS.
For cases other than nS, there is spare machine cycle information 5 consisting of corresponding machine cycle information 6 and 7, of which 5 is 5 so that it can be rewritten. Further, the system control device 1 has a function of reading out the system clock display information 14 from the system clock generation device 2 and generates machine cycle information 6 according to the contents of the system clock display information 14.
, 7. Select one set of machine cycle information from 9 to 12 and store it in the machine cycle information holding register 1 of the processing units 3 and 4.
It has a function 13 for writing to 8 and 19. Further, the processing units 3 and 4 are configured to operate based on the contents of machine cycle information holding registers 18 and 19, respectively.

The operation when setting machine cycle information is as follows. First, the system control device 1 reads out the system clock display information 14 from the system clock generation device 2 and selects machine cycle information for the °C processing devices 3 and 4 according to Table 1. That is, when the value of display bit 17 is 00, machine cycle information conversion table 8 is valid, and when the value of 1 display bit 15 is 1, machine cycle information 9 and 10 is displayed, and when the value of 1 display bit 16 is 1, machine cycle information conversion table 8 is valid. Select machine cycle information 11 and 12.

On the other hand, if the value of 1 display bit 1'I is 1, it is assumed that the spare margin cycle information 5 is valid, and machine cycle information 6 and 7 are selected. Next, the four selected machine cycle information are written into the machine cycle information holding registers 18 and 19 of the processing devices 3 and 4, respectively, to complete the setting of the machine cycle information.

According to this embodiment, when adding new machine cycle values other than XnS and YnS, in addition to changing the system clock generation circuit in the system clock generation device 2, &
C. Set the value of the system clock display bit 17 to 1, and add the machine cycle information to the machine cycle information for the corresponding processing devices 3 and 4 to the spare machine cycle information 6 in the system control device 1. and 7, the amount of changes to the entire information processing system can be reduced.

〔Effect of the invention〕

According to the present invention, when a new machine cycle value different from the machine cycle value assumed at the beginning of the design is added, the amount of design change can be suppressed, which has the effect of reducing the number of man-hours for change. Also.

Since the spare machine cycle information in the system control device can be rewritten, there is an effect that the types of machine cycle values that can be set can be easily increased. Furthermore, even if it becomes necessary to change machine cycle information for the same machine cycle value, this can be easily handled.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. 1... System control device 2...System clock generation device I4...System clock display information 20...System clock signal. ] “、゛ ・J

Claims (1)

[Claims] 1. Consists of a system control device, a system clock generation device, and a plurality of processing devices; the system clock generation device supplies a common system clock signal to each processing device, and the system control device transmits information regarding the system clock value to each processing device. In an information processing system that writes information to A machine cycle information setting method characterized in that a system control device selects machine cycle information corresponding to the information of and writes it to each processing device.