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| author | Flavian Kaufmann <flavian@flaviankaufmann.ch> | 2024-05-09 09:00:34 +0200 |
|---|---|---|
| committer | Flavian Kaufmann <flavian@flaviankaufmann.ch> | 2024-05-09 09:00:34 +0200 |
| commit | 89c0244b8bcd98e8dd273888a0cadc43357f79fc (patch) | |
| tree | ba7ae6d7dca6e98cb61adcbdfcf1577bc22e1b17 /src/control_unit.v | |
| parent | 51e35d48453b6b12eecb97b23fb885f9ae87afe1 (diff) | |
| download | riscv_cpu-89c0244b8bcd98e8dd273888a0cadc43357f79fc.tar.gz riscv_cpu-89c0244b8bcd98e8dd273888a0cadc43357f79fc.zip | |
added jalr instruction
Diffstat (limited to 'src/control_unit.v')
| -rw-r--r-- | src/control_unit.v | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/control_unit.v b/src/control_unit.v index d82db2a..7ca2cb2 100644 --- a/src/control_unit.v +++ b/src/control_unit.v @@ -26,7 +26,8 @@ parameter s00_fetch = 4'h0, s07_alu_wb = 4'h7, s08_execute_i = 4'h8, s09_jal = 4'h9, - s10_beq = 4'ha; + s10_jalr = 4'ha, + s11_beq = 4'hb; reg [3:0] state, next_state; @@ -44,7 +45,8 @@ always @ (*) begin 7'b0110011: next_state <= s06_execute_r; 7'b0010011: next_state <= s08_execute_i; 7'b1101111: next_state <= s09_jal; - 7'b1100011: next_state <= s10_beq; + 7'b1100111: next_state <= s10_jalr; + 7'b1100011: next_state <= s11_beq; endcase s02_mem_addr: case(opcode) @@ -58,7 +60,8 @@ always @ (*) begin s07_alu_wb: next_state <= s00_fetch; s08_execute_i: next_state <= s07_alu_wb; s09_jal: next_state <= s07_alu_wb; - s10_beq: next_state <= s00_fetch; + s10_jalr: next_state <= s07_alu_wb; + s11_beq: next_state <= s00_fetch; endcase end @@ -129,7 +132,14 @@ always @ (*) begin result_src <= 2'b00; pc_update = 1'b1; end - s10_beq: begin + s10_jalr: begin + alu_a_src <= 2'b10; + alu_b_src <= 2'b01; + alu_ctrl <= 2'b00; + result_src <= 2'b10; + pc_update = 1'b1; + end + s11_beq: begin alu_a_src <= 2'b10; alu_b_src <= 2'b00; alu_ctrl <= 2'b01; |