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[/] [minsoc/] [trunk/] [utils/] [minsoc_wb_32_8_bridge.v] - Rev 94
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module minsoc_wb_32_8_bridge( wb_32_sel_i, wb_32_dat_i, wb_32_dat_o, wb_32_adr_i, wb_8_dat_i, wb_8_dat_o, wb_8_adr_i ); input [3:0] wb_32_sel_i; input [31:0] wb_32_dat_i; output reg [31:0] wb_32_dat_o; input [31:0] wb_32_adr_i; output reg [7:0] wb_8_dat_i; input [7:0] wb_8_dat_o; output [31:0] wb_8_adr_i; reg [1:0] wb_8_adr; // put output to the correct byte in 32 bits using select line always @(wb_32_sel_i or wb_8_dat_o) case (wb_32_sel_i) 4'b0001: wb_32_dat_o <= #1 {24'b0, wb_8_dat_o}; 4'b0010: wb_32_dat_o <= #1 {16'b0, wb_8_dat_o , 8'b0}; 4'b0100: wb_32_dat_o <= #1 {8'b0, wb_8_dat_o , 16'b0}; 4'b1000: wb_32_dat_o <= #1 {wb_8_dat_o , 24'b0}; 4'b1111: wb_32_dat_o <= #1 {24'b0, wb_8_dat_o}; default: wb_32_dat_o <= #1 0; endcase // case(wb_sel_i) always @(wb_32_sel_i or wb_32_dat_i) begin case (wb_32_sel_i) 4'b0001 : wb_8_dat_i = wb_32_dat_i[7:0]; 4'b0010 : wb_8_dat_i = wb_32_dat_i[15:8]; 4'b0100 : wb_8_dat_i = wb_32_dat_i[23:16]; 4'b1000 : wb_8_dat_i = wb_32_dat_i[31:24]; default : wb_8_dat_i = wb_32_dat_i[7:0]; endcase // case(wb_sel_i) case (wb_32_sel_i) 4'b0001 : wb_8_adr = 2'h3; 4'b0010 : wb_8_adr = 2'h2; 4'b0100 : wb_8_adr = 2'h1; 4'b1000 : wb_8_adr = 2'h0; default : wb_8_adr = 2'h0; endcase // case(wb_sel_i) end assign wb_8_adr_i = { wb_32_adr_i[31:2] , wb_8_adr }; endmodule
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