elec-374

Verilog CPU Design Project, ELEC 374 - Digital Systems Engineering

#Phase 1 Decisions

Typical Register Implementation

• Global Asynchronous Clear on positive edge
• Rising clock edge response
• Rising clock edge enable

#To Do! and - done reg - done not - done or - done neg - done add - done sub - done shr - done (NOT SIGNED) shra- done (SIGNED) shl - done (NOT SIGNED) ror - done rol - done mul - done div - done alu - done mdr - done, not tested datapath - done encoder - done mux - done pc - done z - done

2023/03/04 -- Sam Notes:

• Always remember to enable your registers in the same line as when you send signal to encoder: T3: begin #10 R2_out <= 1; Y_enable <= 1; #10 R2_out <= 0; Y_enable <= 0; end

• Never perform two operations on the same register in the same state

• Compilation of datapath TB only successful when adding module example(input a, input b);

• Infinite loop of clock cycles: Z output is not visible when simulating

• Need to modify state machine for 2-register operations

• Double-check opcode for all operations (32-bit opcode send to MdataIn)

Datapath Tests:

• or : COMPLETE -
• and : COMPLETE -
• add : COMPLETE
• not : In Progress (TEST) -
• sub : COMPLETE -
• mul : COMPLETE -
• div : COMPLETE -
• shr : COMPLETE -
• shra : Complete (TEST)
• shl : COMPLETE -
• ror : Complete (TEST) -
• rol : Complete (TEST) -
• neg : In Progress (TEST) -

Tests

• and : Good
• or : Good
• sub : Good
• add : Good
• mul : Good
• div : Good
• shr : Good
• shra : Good
• shl : Good
• ror : Good
• rol : Good
• neg : Good
• not : Good

Wave Viewer Requirements:

• Z_Hi (if used)
• Z_low
• Relevant Registers (q outputs)
• MuxOut

Optional?

• MDR
• IR

Kevin: Not Neg Rol Ror

Phase 2

Kevin:

• Ram - Done (not tested)
• Select and Encode Block Diagram - Done (tested in individual TB)
• Sign extension of constant C -
• Revised Register R0

Sam:

• CON FF Logic - Done (Tested in individual TB)
• Computation of the conditional value CON in the CON FF LOGIC (Done)
• Input and output port (Done, not tested)

---

Phase 2 To Do:

• Fill out the rest of the instruction codes in ram (Done)
• Set up template TB for instruction tests (Done)
• Simulate and take screenshots (In Progress)
• Assemble report (In Progress)

Remaining Instructions:

• ld - DONE
• ldi -
• st -
• addi -
• andi -
• ori -
• brzr -
• brnz -
• brmi -
• brpl -
• jr -
• jal -
• mfhi -
• mflo -
• out -
• in -

Phase 2 Docs

• [] Code
• [] IR Values
• [] RAM values
• [] Register you're storing into
• [] Wave form signals