verilog/rtl/ips/zero-riscy/zeroriscy_register_file_ff.v

module zeroriscy_register_file 
#(
  parameter RV32E         = 0,
  parameter DATA_WIDTH    = 32
)
(
	clk,
	rst_n,
	test_en_i,
	raddr_a_i,
	rdata_a_o,
	raddr_b_i,
	rdata_b_o,
	waddr_a_i,
	wdata_a_i,
	we_a_i
);
	//parameter RV32E = 0;
	//parameter DATA_WIDTH = 32;
	input wire clk;
	input wire rst_n;
	input wire test_en_i;
	input wire [4:0] raddr_a_i;
	output wire [DATA_WIDTH - 1:0] rdata_a_o;
	input wire [4:0] raddr_b_i;
	output wire [DATA_WIDTH - 1:0] rdata_b_o;
	input wire [4:0] waddr_a_i;
	input wire [DATA_WIDTH - 1:0] wdata_a_i;
	input wire we_a_i;
	localparam ADDR_WIDTH = (RV32E ? 4 : 5);
	localparam NUM_WORDS = 2 ** ADDR_WIDTH;
	wire [(NUM_WORDS * DATA_WIDTH) - 1:0] rf_reg;
	reg [(NUM_WORDS * DATA_WIDTH) - 1:0] rf_reg_tmp;
	reg [NUM_WORDS - 1:0] we_a_dec;
	always @(*) begin : we_a_decoder
		begin : sv2v_autoblock_1
			reg signed [31:0] i;
			for (i = 0; i < NUM_WORDS; i = i + 1)
				if (waddr_a_i == i)
					we_a_dec[i] = we_a_i;
				else
					we_a_dec[i] = 1'b0;
		end
	end
	genvar i;
	generate
		for (i = 1; i < NUM_WORDS; i = i + 1) begin : rf_gen
			always @(posedge clk or negedge rst_n) begin : register_write_behavioral
				if (rst_n == 1'b0)
					rf_reg_tmp[i * DATA_WIDTH+:DATA_WIDTH] <= 'b0;
				else if (we_a_dec[i])
					rf_reg_tmp[i * DATA_WIDTH+:DATA_WIDTH] <= wdata_a_i;
			end
		end
	endgenerate
	assign rf_reg[0+:DATA_WIDTH] = 1'sb0;
	assign rf_reg[DATA_WIDTH * (((NUM_WORDS - 1) >= 1 ? NUM_WORDS - 1 : ((NUM_WORDS - 1) + ((NUM_WORDS - 1) >= 1 ? NUM_WORDS - 1 : 3 - NUM_WORDS)) - 1) - (((NUM_WORDS - 1) >= 1 ? NUM_WORDS - 1 : 3 - NUM_WORDS) - 1))+:DATA_WIDTH * ((NUM_WORDS - 1) >= 1 ? NUM_WORDS - 1 : 3 - NUM_WORDS)] = rf_reg_tmp[DATA_WIDTH * (((NUM_WORDS - 1) >= 1 ? NUM_WORDS - 1 : ((NUM_WORDS - 1) + ((NUM_WORDS - 1) >= 1 ? NUM_WORDS - 1 : 3 - NUM_WORDS)) - 1) - (((NUM_WORDS - 1) >= 1 ? NUM_WORDS - 1 : 3 - NUM_WORDS) - 1))+:DATA_WIDTH * ((NUM_WORDS - 1) >= 1 ? NUM_WORDS - 1 : 3 - NUM_WORDS)];
	assign rdata_a_o = rf_reg[raddr_a_i * DATA_WIDTH+:DATA_WIDTH];
	assign rdata_b_o = rf_reg[raddr_b_i * DATA_WIDTH+:DATA_WIDTH];
endmodule