Boots – shoes – and leggings
Patent
1993-01-19
1994-05-31
Lee, Thomas C.
Boots, shoes, and leggings
3642318, 3642394, 36426281, 364DIG1, 364948, 36494834, 3649515, G06F 938
Patent
active
053177010
ABSTRACT:
A sequential prefetch method is provided for a pipelined data processor having a sequential instruction prefetch unit (IPU). An instruction queue in the IPU is coupled to a pipelined instruction unit and an instruction cache of the data processor. A prefetch controller in the IPU keeps the instruction stream prefetched so that the instruction queue may load any combination of one, two, or three word instructions into the pipelined instruction unit every clock cycle. The pipelined instruction unit receives instruction words from the instruction queue, and decodes the instruction for execution operations, and for the instruction length/pipeline movement. A queue filling method is provided for maintaining the requisite number of instruction words in the instruction queue to avoid pipeline stalls. The queue filling method is based upon the movement of the instruction pipeline attributable to the usage by an instruction sequencer of the instruction words received from the instruction queue.
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Ledbetter, Jr. William B.
Reininger Russell
Harrity Paul
Lee Thomas C.
Motorola Inc.
Whitaker Charlotte B.
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