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Simplify csr_en logic

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Olof Kindgren 2019-07-14 01:03:04 +02:00
parent 31852f175d
commit fb7c6c1458
1 changed files with 5 additions and 6 deletions
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11
rtl/serv_decode.v
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@ -153,13 +153,12 @@ module serv_decode
//false for mstatus, mie, mcause, mip
wire csr_valid = op20 | (op26 & !op22 & !op21);
assign o_csr_en = (o_ctrl_mret & state[1]) | o_ctrl_trap | (csr_en & csr_valid);
wire csr_en = opcode[4] & opcode[2] & (|o_funct3) & running;
assign o_csr_mstatus_en = csr_en & !op26 & !op22;
assign o_csr_mie_en = csr_en & !op26 & op22 & !op20;
assign o_csr_mcause_en = csr_en & op21 & !op20;
wire csr_op = opcode[4] & opcode[2] & (|o_funct3);
assign o_csr_en = state[1] & (o_ctrl_mret | state[0] | (csr_op & csr_valid));
assign o_csr_mstatus_en = csr_op & (state == RUN) & !op26 & !op22;
assign o_csr_mie_en = csr_op & (state == RUN) & !op26 & op22 & !op20;
assign o_csr_mcause_en = csr_op & (state == RUN) & op21 & !op20;
assign o_alu_cmp_eq = o_funct3[2:1] == 2'b00;