JPS5960785A - Selection system for function block substrate - Google Patents

Abstract

PURPOSE:To save the labor exchange of cards and to reduce the errors generated with exchange of cards by comparing a slot address signal with a substrate selecting address signal and permitting an access for a function block substrate with which the coincidence is obtained between both above-mentioned address signals. CONSTITUTION:A binary comparator of each memory compares a slot address signal with 4 bits (substrate selecting address signal) of a memory access address signal of 16 bits sent from the CPU side. Then the binary comparator enables the access of own memory card when the coincidence is obtained with above- mentioned comparison and has an access of each memory element within the own memory card by means of lower 12 bits of a memory access address. The memory card can be simply exchanged by just replacing it, and this eliminates completely the address setting of the card when the card is exchanged. In other words, an operation exactly equal to that so far carried out is effective despite replacement between memory cards CD0 and CD1. As a result, no address setting error is produced when the cards are exchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a selection system for a functional block board connected to a pack panel.

(2) Conventional technology and problems Connect multiple memory cards of the same type, functional block boards (hereinafter simply referred to as cards) such as I10 control cards, etc. to the pack panel, and select one of these cards from the CPU side. In this case, the following methods were conventionally used. That is, a decoder is provided inside the card, and the address sent from the CPU side via the pack panel is decoded.
When the decoded output corresponds to the own card, the activation of the own card is enabled.

However, according to such conventional technology, it is necessary to provide each card with its own address in advance. For example, what about cards? When mounting the card on a channel, it is necessary to set its own address by short-circuiting one of the multiple outputs of the in-card decoder with a pin or the like.

According to the conventional technology that sets the address for each card in this way, when exchanging cards, the same address must be set on the new card. There was a high risk of causing a setting error υ.

(3) Purpose of the Invention Therefore, the present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to provide a card that is easy to use when exchanging cards and is less likely to cause errors when exchanging cards. (Functional block board) The purpose is to provide a selection system.

(4) Structure of the Invention The features of the present invention that achieve the above-mentioned objects include a plurality of functional block boards of the same type and slots into which the respective functional block boards are inserted and connected. means for supplying a fixed slot address signal preset for each slot to each slot of the pack panel, and supplying a board selection address signal representing a functional block board to be selected to each slot of the pack panel. and a coincidence detection circuit for comparing the slot address signal applied from the connected slot with the board selection address signal and detecting a coincidence between the two. In some cases, the detected functional block board is made accessible.

(5) Examples of the invention The present invention will be described in detail below using the drawings.

The figure shows a partial configuration of an embodiment of the present invention, and in the figure, BP is a pack panel and 5LTo.

5LT5.5LT2 is a functional board, that is, a card, which is inserted and connected to each of the slots provided in the pack panel Bp, namely, the CD, lCD, and lCD cover slots.

Card CD6 #CD/a CD in non-example
2 are memory cards each having a large number of memory IC elements mounted thereon. Each memory card CD6 r CD7 p
The CDs are of the same type and have exactly the same configuration. Although three memory cards and slot 1 are not shown in the figure, it is assumed that there are actually many.

In the figure, a route address line is further connected to the ADRFi CPU side, and, for example, a 16-bit address signal is commonly sent to each slot (K). Also, 5ADo, 5AD
1.5AD2 is each slot 5LTol SI,T, .

This is a slot address signal generation circuit that generates one set of slot address signals for each 5LT2.
, generate mutually different 4-bit binary signals. For example, 5ADo is oooo'.

SAD generates slot address signals of 0001'' and 5AD2 generates slot address signals of 0010'.

On the other hand, on the memory card side, there are connection terminals and connection lines for 16 bits connected to the aforementioned address line ADRK in each slot, connection terminals and connection lines for 4 bits connected to the slot address signal generation circuit in each slot,
Other data input/output terminals (not shown) are also provided. Furthermore, each memory card SLT, SLT,
, SLT, are pinary controllers C0Mo, COM, , to which the upper 4 bits of the 16-bit memory access address are sent.
C0M2 is provided. These binary converters are further configured to receive the aforementioned 4-bit slot address signal. Each hun/9
Raters C0Mo, C0M1. The output of C0M2 is connected to the access enable terminal of each memory card.

In this way, the pinary converter of each memory card compares 4 bits (board selection address signal) of the 16-bit memory access address signal sent from the CPU side with the slot address signal described above. , when they match, access to its own memory card is enabled, and each memory element in its own memory card is accessed according to the lower 12 bits of the memory access address.

By configuring as in this embodiment, memory cards can be replaced by simply replacing the cards, and there is no need to set the address of the card at the time of replacement. For example, in the example shown in the figure, even if the memory cards CDo and CD are replaced, the same operation as before is performed. Therefore, the time and effort required when exchanging cards is greatly reduced, and there is no possibility of incorrect address setting when exchanging cards.

(6) Effects of the Invention As explained in detail above, according to the present invention, only a coincidence detection circuit is provided on the card side, and a fixed slot address signal determined for each slot on the back panel side and a card to be selected are provided. Since the above-mentioned match detection circuit detects the match with the card selection address signal representing Effects can be obtained.

[Brief explanation of drawings]

The figure is a partial configuration diagram of an embodiment of the present invention. B P-...Pack panel, 5LTo, SLT,
, SLT, 2...slot, CD, CD11CD
2...Card, ADR...Address line, 5ADo,
SAD, , 5AD2-...Slot address signal generation circuit, C0Mo, COM, , C0M2-
...binary converter.

Claims (1)

[Claims] 1. A plurality of functional block boards of the same type, a pack panel or panel having slots into which each functional block board is inserted and connected, and a fixed slot address signal set in advance for each slot in each slot of the pack panel. supplying means, and means for supplying a board selection address signal representing a functional block board to be selected to each slot of the pack/9 channel; A function characterized in that a coincidence detection circuit is provided that compares the slot address signal and the board selection address signal to detect a match between the two, and a functional block board for which a match is detected can be accessed. Block board selection system.