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Pipeline and Control Unit Desi

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  • 上传时间:2021-06-22
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  • 标      签: Pipeline C

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last month, I discussed the instruction set and the datapath of an xr1616-bit RISC processor. Now, I’ll explain how the control unit pushesthe datapath’s buttons. Figure 2 in Part 1 (Circuit Cellar,116) showed the CTRL16 control unitschematic symbol in context. Inputs include the RDY signal from thememory controller, the next instruction word INSN15:0 from memory, andthe zero, negative, carry, and overflow outputs from the datapath.The control unit outputs manage the datapath. These outputs includepipeline control clock enables,register and operand selectors, ALUcontrols, and result multiplexer output enables. Before designing thecontrol circuitry, first consider how the pipeline behaves in both good and bad times.
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