Program control operation to execute a loop processing not immediately following a loop instruction
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United States of America Patent
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Aug 12, 1997
Grant Date -
N/A
app pub date -
Aug 1, 1995
filing date -
Aug 18, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention is directed to a program control unit which enables a program control to achieve an efficient loop processing which does not immediately follow a loop instruction and which contains a start address and end address. In the program control unit, the start address and end address of a loop processing are stored in a register (start) (7) and a register (end) (8), respectively, in synchronization with a clock t1. The stored data 'start' of the register (7) and the stored data 'end' of the register (8) are inputted to a comparator (12) and a comparator (11), respectively. The comparator (12) compares the output from a delay program counter (18) with the data 'start', and sets a flag f start when the comparison result indicates agreement and otherwise resets it. The comparator (11) compares the output from a delay program counter (18) with the data 'end', and sets a flag f end when the comparison result indicates agreement and otherwise resets it.
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