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Clarify immdec_ctrl[1]

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Olof Kindgren
2020-08-28 12:52:28 +02:00
parent 8faf0cf33b
commit 3f81f07db3
1 changed files with 2 additions and 2 deletions
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4
rtl/serv_decode.v
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@@ -167,8 +167,8 @@ module serv_decode
//True for S (STORE) or B (BRANCH) type instructions
//False for J type instructions
assign o_immdec_ctrl[0] = opcode[3:0] == 4'b1000;
//True for OP-IMM, LOAD, STORE, JALR
//False for LUI, AUIPC, JAL
//True for OP-IMM, LOAD, STORE, JALR (I S)
//False for LUI, AUIPC, JAL (U J)
assign o_immdec_ctrl[1] = (opcode[1:0] == 2'b00) | (opcode[2:1] == 2'b00);
assign o_immdec_ctrl[2] = opcode[4] & !opcode[0];
assign o_immdec_ctrl[3] = opcode[4];