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Byte enable implemented

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Florian Zaruba 2017-04-25 15:33:34 +02:00
parent ec4384a95f
commit 33a88d8b10
1 changed files with 51 additions and 1 deletions
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52
lsu.sv
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@ -150,8 +150,58 @@ module lsu #(
// ---------------
// ---------------
// Byte Enable
// Byte Enable - TODO: Find a more beautiful way to accomplish this functionality
// ---------------
logic [7:0] data_be_o;
always_comb begin : byte_enable
case (operator_i)
LD, SD: // double word
case (vaddr[2:0])
3'b000: data_be_o = 8'b1111_1111;
3'b001: data_be_o = 8'b1111_1110;
3'b010: data_be_o = 8'b1111_1100;
3'b011: data_be_o = 8'b1111_1000;
3'b100: data_be_o = 8'b1111_0000;
3'b101: data_be_o = 8'b1110_0000;
3'b110: data_be_o = 8'b1100_0000;
3'b111: data_be_o = 8'b1000_0000;
endcase
LW, LWU, SW: // word
case (vaddr[2:0])
3'b000: data_be_o = 8'b0000_1111;
3'b001: data_be_o = 8'b0001_1110;
3'b010: data_be_o = 8'b0011_1100;
3'b011: data_be_o = 8'b0111_1000;
3'b100: data_be_o = 8'b1111_0000;
3'b101: data_be_o = 8'b1110_0000;
3'b110: data_be_o = 8'b1100_0000;
3'b111: data_be_o = 8'b1000_0000;
endcase
LH, LHU, SH: // half word
case (vaddr[2:0])
3'b000: data_be_o = 8'b0000_0011;
3'b001: data_be_o = 8'b0000_0110;
3'b010: data_be_o = 8'b0000_1100;
3'b011: data_be_o = 8'b0001_1000;
3'b100: data_be_o = 8'b0011_0000;
3'b101: data_be_o = 8'b0110_0000;
3'b110: data_be_o = 8'b1100_0000;
3'b111: data_be_o = 8'b1000_0000;
endcase
LB, LBU, SB: // byte
case (vaddr[2:0])
3'b000: data_be_o = 8'b0000_0001;
3'b001: data_be_o = 8'b0000_0010;
3'b010: data_be_o = 8'b0000_0100;
3'b011: data_be_o = 8'b0000_1000;
3'b100: data_be_o = 8'b0001_0000;
3'b101: data_be_o = 8'b0010_0000;
3'b110: data_be_o = 8'b0100_0000;
3'b111: data_be_o = 8'b1000_0000;
endcase
endcase
end
// ---------------
// Sign Extend