Bus sourcing and shifter control of a central processing unit

Details Bus sourcing and shifter control of a central processing unit Bus sourcing and shifter control of a central processing unit

G - Physics

06

F

354/238

G06F 9/34 (2006.01) G06F 9/315 (2006.01)

Patent

CA 1182579

ABSTRACT OF THE DISCLOSURE A data processing system includes a memory subsystem for storing operands and instructions and a central processing unit (CPU) for manipulating the operands by executing the instructions. The CPU includes a control store for generating signals for controlling the CPU operation. Shifters made up of multiplexers shift operands between an outer bus and a write bus in response to control store signals. The multiplexers shift the operands left or right 1, 2 or 4-bit positions including open shifts and circular shifts and also perform byte position shifting and twinning.

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