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ece222: finish datapath

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eggy 2023-11-03 12:43:52 -04:00
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commit b48570ad09
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docs/2a/ece222.md
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@ -103,5 +103,11 @@ To execute an instruction, the following steps are observed:
- decode fields like the op-code, offset - decode fields like the op-code, offset
- read recoded registers - read recoded registers
3. Execute (EX) 3. Execute (EX)
- ALU shenanigans - ALU calculates ADD, SUB, etc, as well as addresses for LDR/STR, sets zero status for CBZ
- branch adder calculates any branch target addresses
4. Memory (ME)
- if memory needs to be reached, either `Write` or `Read` must be asserted to prepare for it
- write to memory
5. Writeback (WB)
- write results to registers from memory, the ALU, or another register