DE2937785A1 - Programme controlled addressing of computer system - has structure stored in ROM and selection controlled by memory cells - Google Patents

Abstract

A computer system has programme controlled inout of addresses for selection of system modules based upon serial, direct or parallel operating modes. The addresses are stored in ROM modules. The control card receives a number of address bits that are processed by EXCLUSIVE OR gates. Another four address bits are decoded to identify up to 16 separate control units. A clock signal input operates through an AND gate arrangement that receives inputs indicating the operation e.g. read/write, erase etc., to access the decoder. The specific decoder output clocks 6 memory cells, e.g. flip-flops, to generate an enable for the selected read-only-memory containing the addresses.

Description

Procedure for the program-controlled allocation of target addresses or

Address areas at modules and structure of a module file in bus-oriented computer systems The invention relates to a method for program-controlled Allocation of target addresses or address ranges to assemblies and structure of an assembly file in bus-oriented computer systems.

In computer systems, the individual modules must be given addresses (passwords) be provided in order to be able to address them specifically by the central unit.

Because the types and positions of the assemblies are different type, position and operating status of each individual assembly must be queried and stored in read / write memories. The program then takes effect when necessary back to this assembly file.

The target address input in previous computer systems is done entueder by directly entering the address manually, e.g. B. by switch or solder bridge or by indirect manual input via the connector of the module. In the case of direct manual entry of the destination address, maintenance and repair work a new manual entry in each case, especially when replacing assemblies the destination address notuendiq. In particular, the source of error is humans, but also the dangers when using ton Vchaic contacts as well as the limited number of changes the destination address is a disadvantage. Indirect manual entry of the destination address Via the connection plug of an assembly is position-dependent, occupies a large Number of connections of the connector is in case of changing an address extremely labor-intensive and requires a lot when assembling a computer arllage Workload.

E3: In any case, it is only possible through an extensive additional program and considerable Teaching effort on the individual assemblies possible, location and number of the different To determine types of assemblies, to check their operating status and possible Identify reserve modules with module type and location in the computer system and to be created in a read / write memory as a module data.

he invention is based on the task of entering the destination address or the target area in an assembly without the disadvantages mentioned above and to set up an assembly file if necessary.

After finding the destination address is entered in the individual Assembly through a special input program, which is always at the beginning of the program runs in a computer system. The respective addresses for the individual modules are stored in read-only memories or can be calculated: in the The respective target addresses of the assemblies then become the course of the input program taken over in electronic storage units (flip-flop etc.) and are therewith ready for address recognition within the module.

If one or more modules fail, a new program loop the target address in the defective module is deleted and assigned to a reserve module will. This enables very fast switching without additional program loops in the main program.

The correct assignment of the target address to the respective module takes over thereby a control unit, whereby there are basically 3 possible types of control result: a) The target address is entered using a serial control of the individual modules (Fig. la), with the respective address on the address bus is given and with the help of the control unit and a special control line a signal is given to accept and save the target address in the module will. Successful storage of an address value can be done via the data bus and / or a separate bus connection can be reported to the central computer unit. Due to the nature and track of this confirmation message, a large number of Information about the type and operating status of the module is possible can be used to check and secure the program-controlled address input can, if necessary, scuie to set up an assembly file. After the takeover and storage of the respective address value is the electronic interruption the control line canceled by the assembly and thus allows for the following Target address input cycle the addressing of the next module by the transfer signal and thus the reading in and storage of the next destination address.

Several individually selectable connections can be connected to the control unit Control guidelines are provided, such as. B. in the embodiment the control lines ADA I to ADA VI in Figure 2, the functionally different assemblies from each other to be separated, or in the case of a spatially separate structure, a control line for each structural unit to obtain. The number of control lines can vary depending on the used Computer system, increase as required.

#) The target address is entered with the help of a direct control drr individual connector in the bus system of the computer system (Fig. lb). In contrast for serial control, the control line is required in a space in the bus system not to be bridged by a special additional circuit, as with the direct Control of each connector of the bus system individually connected to the control card is. This targeted However, a single connection requires an increased Number of connection points on the plug-in card. The takeover and storage takes place on the individual assemblies as described under point a).

c) The address value is entered with the help of a parallel control the individual connector through an additional bus in the bus system of the computer system. (Fig. Lc) There is a circuit on the assembly for this additional bus for recognizing an address value, whereby the address value is identical for all modules is. By swapping the connections within this additional bus connection it is possible to control each of the connectors specifically in order to take over and to control storage of the addressees. The advantages of direct control remain.

Embodiment for the serial control of the destination address input The embodiment of the invention described below is for a smaller one Computer system designed in which a relatively large number of input / output connections are necessary are. The program-controlled entry of the target address ;; takes place in this embodiment with the help of a serial control of the individual assemblies.

The control card (Fig. 2) is the only assembly outside of the basic computer system has a fixed address. Find h within the basic computer systems The hard drive memory for the actual program is the computer module including the necessary modules for data and address bus connections, etc. The control card (Fig. 2) is the only possible control point before the program-controlled Entry of target addresses outside of the basic computer system. The evaluation and Recognition of the address.

values A 4 to A 15 are made using 12 exclusive NOR gates, where as Festuert s 9000 (hexadecimal notation) was entered as the address.

With the address values A 0 to A 3, the range between the addresses s 9000 to S 900F broken down into 1G individual address recognition outputs in order to connect up to 16 control units for the input of destination addresses to enable.

In the program sequence, the control card is addressed in step 1 and response of the memory unit via the write command, thus via the data bus one of the 6 control lines ADA I to ADA II is zeroed. In the next program step the respective new address is sent to the address bus and with the help of the signal from the system cycle 2 and dt: signal for a valid address value a signal given the control line ADA. On the base map (picture 3) is for storage a memory unit is provided for the address values A 4 to A 15 # write-read memory the Take over evaluation and recognition of an address accepted in this memory uieder 12 exclusive NOR gates and with the help of the 1 out of 16 decoder module is a Control of 16 x 8 bi systems possible.

At the beginning of the input program for the address values, the delete command sets all destination address memories to 0.

In the idle state, the ADE input is at 0 potential, gate G 1 and G 3 are blocked. At the output of G 3 there is H potential. Because the exit Q 12 from IC 1 is at 0 potential, this also results in 0 potential at the output of G 4. The control line between ADE and ADA is interrupted by G 2. Meets If the signal on the control line is on, G 1 is used to take over and save the pending address values in the target address memory is triggered. The exit of G 3 receives 0 potential as long as the takeover signal is present on the control line.

The data bus is then controlled to no via G 6, so that the successful Enter the address to report to the basic computer system. Through further gate functions, identical to G 6, the transfer of further information is possible (Art and Operating status etc.) in order to create the assembly file. After on the Control line is 0 potential, the output of G 3 is high potential and together with the H potential of G 12 of the memory IC I, the Ausclar becomes from G 4 to attain an H potential. This means that the control line is via G 2 for the next Signals switched through, the flip-flop circuit from G 3, G 4 and G 5 has a stable The location is preserved and the control of the Daterleiturg via G 6 is canceled. as well the switch-off command for the 1 out of 16-4 decoder is canceled and the connection with the date system is done. Only the ADA output needs to go to the next base edge the previous card with the ADE input of the next card via the control line get connected.

The central unit now calculates from the start address and the reported Type Utrr module the necessary address range and provides the target address of the next Assembly firmly.

The connected systems (decoded outputs AxO-Ax15) are thus operable without additional address recognition circuitry.

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Claims (2)

Claims 1.) Method for the program-controlled input of Destination addresses or Address areas in modules of a bus-oriented computer system characterized in that the respective addresses are contained in read-only memories are and / or are calculated from an initial value and with the help of a control unit in serial, direct and parallel control in read / write memories the assemblies are entered by a special program in order to be recognized there to serve the target address or the address range. 2.) Procedure for creating an assembly file including a site plan of the assemblies within a bus-oriented computer system, characterized in that that during the program-controlled input of target addresses or address ranges an assembly file is set up in assemblies in the type, position, operating status etc. of each assembly and thus the computer system in the further program sequence is available.