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This article describes a mechanism which provides a repeat cycle enabling function in a microprogram-controlled processor.
English (United States)
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Repeating Microcode Words for Fast Controlled Repeat Cycle Functions
This article describes a mechanism which provides a repeat cycle enabling
function in a microprogram-controlled processor.
In microcode-controlled processors, repeating operations are usually
performed in a microcode test and branch loop requiring an extra test and branch
microcode word execution time for each time through the loop. The mechanism
of this disclosure provides for elimination of the test and branch microcode word
and the time for its execution.
Many functions performed by microcode-controlled processors require
looping functions such as repeat addition cycles for multiplication, repeat shifting
for divide alignment, repeat subtraction for divide and repeat shifting for floating-
point normalization, convert hex to floating point, and floating-point equate
exponents. The hardware provided in the processor illustrated in the drawing
provides for the repeat execution of selected micro-control words during the
previously mentioned operations.
As each of the looping micro-control words begins execution, a loop on the
microword control latch is set at (a). This latch controls the gating of micro-
control words into the control register at (b). If the latch is ON, the control word
clocked into the control register at the beginning of the next cycle will be from the
output of the current control register instead of control ROS. This pattern will
continue for each cycle until the latch is r...