CS232178B1 - Flexible disk controller microprogram control circuit - Google Patents

Abstract

The invention relates to a floppy disk controller. The circuit solves the method of microprogram jump according to input channel commands and the respective states of the resulting byte of the own microprogram before the microprogram jump. The solution has achieved the replacement of imported circuits with domestic ones. Possibility of use only in the given circuit of the floppy disk controller.

Description

The circuit control circuit program of the flexible disk controller relates to the reception and decoding of the control commands and status signals, and according to these commands the operation of the control program is changed.

The existing circuitry uses a permanently imported multiplex circuit, while the new circuit solution according to the invention uses only conventional base circuits.

The principle of the microcontroller control program of the flexible disk controller according to the invention is that the decoder selection input is connected to the first input of the primary instruction selection memory and at the same time to the first selection memory input whose second input is connected to the masking field input and to an input of a logic circuit whose second input is connected to the negated output of the primary instruction selection memory, whose input is connected to the masking field input, and whose direct output is connected to the second bus code switch switch whose code input is connected to input code A and whose code input is connected to the request code B input and whose output is connected to the input of the microprogram controller whose reset input is connected to the reset input N and the input of the logic circuit, its output is connected to the bus code switch input; is connected to logic output, point.

The new circuit design allows micro-program jump according to the input channel commands and corresponding states of the resulting byte of the micro-program itself. The wiring of the present invention is simple and advantageously utilizes program states over micro-program jump when non-importing logic circuits are used.

232 178

One possible embodiment of the circuit for the risk program of the flexible disk controller according to the invention is shown in the attached drawing.

According to the figure, the decoder selection input V is connected to the first input 12 of the primary instruction selection memory 1, to whose second input 11 the mask field input VM is connected. The input in the decoder selection is also connected to the first input 22 of the selection memory 2, to whose second input 21 the mask field input KM is connected. the alloyed output 23 of the selection memory 2 is then connected to the input 32 of the logic circuit 3, whose other input 31 is connected to the negated output 14 of the selection instruction primary memory 1. The output 33 of the logic circuit 3 is connected to the input 41 of the logic circuit 6, whose output 43 is connected to the input 52 of the bus code switch 5, the second input 51 of which is connected to the direct output of the primary instruction selection memory 1. An input code input A is connected to the code input 53 of the bus code switch 5 and its request code input B is connected to its code input 54. The bus code switch 6 switches one of the two code combinations to output 55. This output 55 is connected to the input 61 of the microprogrammer 6 which already performs the necessary microprogram jumps. The second reset input 62 of the microcontroller 6 is connected to the input 42 of the gate logic circuit 4 and to the reset input N, by which the bus code switch 5 is reset.

The input signal In the decoder selection, it writes to the two memories, namely the selection memory 2 and the primary instruction selection memory JL, the values of the logical levels of the input wiring input signals, namely from the masking field VM input and masking field KM input. The outputs 23 of these memories allow the selection of the input request code by negating both memories to the logic circuit 6, whose output 33 then over the next barrier logic circuit 4 influences the selection of the input code combinations to be written to the bus code switch 5. Another input signal, which is a direct output of the primary instruction selection memory 1, is controlled by the bus code switch 6. Thus, the bus code switch 5 switches input input code A or request code input B to cell output 55. The output 55 is already connected to the microprogram controller 6 and controls the microprogram jumps. Input N reset is then both

232 178 connected to the barrier logic circuit 4 as well as directly to the microprogram controller 6 input to ensure that the microprogram is set to its default state ·

The circuit according to the invention is intended for a flexible disk controller.

Claims (1)

SUBJECT OF THE INVENTION Circuit diagram for a flexible disk controller control program, characterized in that the decoder selection input (V) is connected to the first input (12) of the primary instruction selection memory (1) and to the first input. (22) a selection memory (2), the second input (21) of which is connected to the input (KM) of the masking field and the negated output (23) is connected to the input (32) of the logic circuit (3) connected to the negated output (14) of the primary instruction selection memory (1) whose input (11) is connected to the input (VM) of the masking field and whose direct output (13) is connected to the second input (51) of the bus code switch (5) whose code input (53) is connected to an input (A) of the input code and whose code input (54) is connected to an input (B) of the request »type and whose output (55) is connected to an input (61) of the controller ( 6) a microprogram whose reset input (62) is connected to the reset input (N) and the input (42) of the barrier logic circuit (4), its output (43) is connected to the input (52) of the bus code switch (5); wherein its input (41) is connected to the output (33) of the logic circuit (3) o