Boots – shoes – and leggings
Patent
1980-07-09
1983-02-08
Shaw, Gareth D.
Boots, shoes, and leggings
G06F 928, G06F 938
Patent
active
043731805
ABSTRACT:
A microprogrammed control system capable of overlapping the fetch and execution of microinstructions even when a conditional jump microinstruction is being executed. The control system comprises a pipeline register for storing the microinstruction currently being executed. The system also includes address circuitry for forming an "ordinary address" which is one greater than the address of the microinstruction in the pipeline register and for forming at least one "jump address" of a microinstruction occurring elsewhere in the program. A conditional jump microinstruction identifies a jump address for the microinstruction to be executed next, which jump address is only valid after the condition identified by the conditional jump instruction is tested and indicates that the jump address is to be used. Otherwise, the next microinstruction has an ordinary address. Selection circuitry cooperates with at least one bit signal transmitted from the anticipated condition field in the conditional jump instruction to anticipate the result of testing the condition specified and selects an address from the address circuitry for transmission to the control store memory before testing of the specified condition is complete. The selection circuitry comprises correction circuitry which changes the selection of the address of the next microinstruction to be executed when the anticipated test result and the actual test result do not agree. When this occurs, the selection circuitry extends the cycle time of the control system to allow for correction.
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Bell James R.
Shaw Gareth D.
Soffen Stephen A.
Sperry Corporation
Truex Marshall M.
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