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Shown in Fig. 1 is a microprogram (or program) instruction structure which can be employed to check the hardware.
English (United States)
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Microprogram Sequence Control
Shown in Fig. 1 is a microprogram (or program) instruction structure which
can be employed to check the hardware.
It is proposed to check that the sequence control bit is going from 1 to 0 or 0
to 1 from one instruction to the next during the sequence of instructions.
In addition, each instruction is provided with a sequence
change bit to take into account possible branch operations which may
result in breaking the sequence of the control bits. The change
bit in one instruction is set to 1 when a branch on condition
branches this instruction to another one whose control bit has the
same value as that of the control bit in the one instruction.
The following rules will be applied:
- Every instruction must be executed on a control bit 1/control
0 basis if in the same sequence.
- When a branch on condition is executed, a change bit 0 may
if the condition occurs.
- When an unconditional branch is executed, a change bit 0 may
This method checks the instruction storage hardware and associated
addressing facilities. It also provides a means of checking the hardware when
branches to wrong addresses occur.
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