diff options
Diffstat (limited to 'rtl/src/verilog/core_selector.v')
| -rw-r--r-- | rtl/src/verilog/core_selector.v | 106 |
1 files changed, 90 insertions, 16 deletions
diff --git a/rtl/src/verilog/core_selector.v b/rtl/src/verilog/core_selector.v index a18bfe6..3f74a26 100644 --- a/rtl/src/verilog/core_selector.v +++ b/rtl/src/verilog/core_selector.v @@ -48,26 +48,100 @@ module core_selector input wire [31 : 0] write_data ); - localparam SHA256_BASE_ADDR = 6'h14; - wire access_sha256 = (sys_eim_addr[13 : 8] == SHA256_BASE_ADDR) ? 1'b1 : 1'b0; - wire read_access = sys_eim_rd & access_sha256; - wire write_access = sys_eim_wr & access_sha256; - wire select = read_access | write_access; - assign read_data = (sys_eim_rd) ? 32'hdeadbeef : 32'haa55aa55; + // + // Parameters + // + localparam ADDER_BASE_ADDR = 6'h00; // upper 6 bits of address + localparam ADDER_OFFSET_X_REG = 8'h00; // X + localparam ADDER_OFFSET_Y_REG = 8'h01; // Y -// sha256 sha256_inst( -// .clk(sys_clk), -// .reset_n(~sys_rst), + + /* This flag detects whether adder core is being addressed. */ + wire eim_access_adder = (sys_eim_addr[13:8] == ADDER_BASE_ADDR) ? 1'b1 : 1'b0; + + /* These flags detect whether write or read access is requested. */ + wire eim_access_write = sys_eim_wr & eim_access_adder; + wire eim_access_read = sys_eim_rd & eim_access_adder; + wire select = eim_access_read | eim_access_write; + +// reg [31 : 0] read_data_reg; +// reg [31 : 0] y_reg; +// reg [31 : 0] x_reg; +// +// // +// // Write Request Handler +// // +// always @(posedge sys_clk) +// // +// if (sys_rst) begin +// x_reg <= 32'hdeaddead; +// y_reg <= 32'hbeefbeef; +// end +// else if (eim_access_write) begin +// case (sys_eim_addr[7:0]) +// ADDER_OFFSET_X_REG: x_reg <= write_data; +// ADDER_OFFSET_Y_REG: y_reg <= write_data; +// endcase +// end +// +// +// // +// // Read Request Handler +// always @(posedge sys_clk) +// // +// if (sys_rst) +// read_data_reg <= 32'h00000000; +// // +// else if (eim_access_read) begin +// // +// case (sys_eim_addr[7:0]) +// ADDER_OFFSET_X_REG: read_data_reg <= x_reg; +// ADDER_OFFSET_Y_REG: read_data_reg <= y_reg; +// endcase +// // +// end + +// assign read_data = read_data_reg; + + + // localparam SHA256_BASE_ADDR = 6'h14; + // + // wire access_sha256 = (sys_eim_addr[13 : 8] == SHA256_BASE_ADDR) ? 1'b1 : 1'b0; + // wire read_access = sys_eim_rd & access_sha256; + // wire write_access = sys_eim_wr & access_sha256; + // wire select = read_access | write_access; + +// reg [31 : 0] read_data_reg; +// wire [31 : 0] sha_read_data; // -// .cs(select), -// .we(write_access), +// assign read_data = read_data_reg; // -// .address(sys_eim_addr[7 : 0]), -// .write_data(write_data), -// .read_data(read_data), -// .error() -// ); +// always @ (posedge sys_clk) +// begin +// if (sys_rst) +// begin +// read_data_reg <= 32'h00000000; +// end +// else +// begin +// read_data_reg <= sha_read_data; +// end +// end + + + sha256 sha256_inst( + .clk(sys_clk), + .reset_n(1'b1), + + .cs(eim_access_adder), + .we(sys_eim_wr), + + .address(sys_eim_addr[7 : 0]), + .write_data(write_data), + .read_data(read_data), + .error() + ); endmodule |