12-10-2020, 08:11 PM
Control signals get generated based on opcode bits. Hardwired setups use logic gates for this. They run quick but stay rigid once built. Microprogrammed ones store steps in ROM instead. You change those easier when bugs pop up. I tried both approaches on old boards before. Maybe timing issues creep in during multi cycle runs. Or perhaps single cycle designs waste power on waits. Now registers get updated in sequence after decode. Then the next fetch starts right away.
You handle pipelining by overlapping these stages carefully. Hazards show up when data depends overlap. I fix stalls with forwarding paths mostly. Branch predictions help guess jumps ahead too. Control organizes the hazard detection units here. Perhaps flush logic clears wrong paths quick. Also execution units wait on ready signals sometimes. You watch performance climb with better organization.
Fragments of microcode let you tweak rare instructions. Hard logic locks in the common paths tight. I prefer mixing both for balance in designs. Signals sequence through decoders without much delay. Registers transfer data under strict control pulses. Now clock edges trigger most of these moves. You adjust pulse widths to match hardware speeds.
Or maybe add extra states for complex ops like division. Control units evolve with each CPU generation fast. I see this in modern chips handling vectors well. Execution flows smoother when organization stays clean. Perhaps test benches reveal hidden timing glitches early. Signals route through multiplexers under select lines. You trace paths during debug sessions often.
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