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Optimize op_b selector

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This commit is contained in:
Olof Kindgren 2018-12-14 06:12:00 +01:00
parent e3e616903e
commit 78821c16b3
1 changed files with 3 additions and 4 deletions
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7
rtl/serv_decode.v
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@ -273,10 +273,9 @@ module serv_decode
assign o_imm = (!(gate1 | gate12) & (cnt_done ? signbit : m1 ? imm11_7[0] : imm24_20[0]));
assign o_op_b_source = (opcode == OP_OPIMM) ? OP_B_SOURCE_IMM :
(opcode == OP_BRANCH) ? OP_B_SOURCE_RS2 :
(opcode == OP_OP) ? OP_B_SOURCE_RS2 :
1'bx;
//0 (OP_B_SOURCE_IMM) when OPIMM
//1 (OP_B_SOURCE_RS2) when BRANCH or OP
assign o_op_b_source = opcode[3];
assign o_rd_ctrl_en = opcode[0];
assign o_rd_alu_en = !opcode[0] & opcode[2] & !opcode[4];