Squashed B200 FPGA Source. Code from Josh Blum, Ian Buckley, and Matt Ettus.

Original-commit: 0df4b801a34697f2058b4a7b95e08d2a0576c9db

lib/wishbone/simple_uart_tb.v

@@ -0,0 +1,127 @@
+module simple_uart_tb();
+   
+   localparam SUART_CLKDIV = 0;
+   localparam SUART_TXLEVEL = 1;
+   localparam SUART_RXLEVEL = 2;
+   localparam SUART_TXCHAR = 3;
+   localparam SUART_RXCHAR = 4;
+   
+   reg           clk;
+   reg 		 rst;
+
+   reg 		 we_i;
+   reg 		 stb_i;
+   reg 		 cyc_i;
+   wire 	 ack_o;
+   reg [2:0] 	 adr_i;
+   reg [31:0] 	 dat_i;
+   wire [31:0] 	 dat_o;
+   wire 	 rx_int_o;
+   wire 	 tx_int_o;
+   wire 	 tx_o;
+   reg 		 rx_i;
+   wire 	 baud_o;
+
+   reg [31:0] 	 read_data;
+   
+
+   initial 
+     clk = 0;
+
+   // 200MHz clock
+   always
+     #2.5 clk = ~clk;
+
+   initial begin
+      rst <= 0;
+      we_i <= 0;
+      stb_i <= 0;
+      cyc_i <= 0;
+      adr_i <= 0;
+      dat_i <= 0;
+      rx_i <= 0;
+   end
+   
+   
+   task write_wb;
+      input [31:0] data_in;
+      input [2:0]  addr_in;
+
+      begin
+	 @(negedge clk);	 
+	 dat_i <= data_in;
+	 adr_i <= addr_in;
+	 we_i <= 1;
+	 stb_i <= 1;
+	 cyc_i <= 1;
+	 @(negedge clk);
+	 while (ack_o == 0) begin
+	    @(negedge clk);
+	 end
+	 dat_i <= 0;
+	 adr_i <= 0;
+	 we_i <= 0;
+	 stb_i <= 0;
+	 cyc_i <= 0;
+      end
+   endtask // write_wb
+
+   
+   task read_wb;
+      output [31:0] data_out;
+      input [2:0]  addr_in;
+
+      begin
+	 @(negedge clk);	 
+	 adr_i <= addr_in;
+	 we_i <= 0;
+	 stb_i <= 1;
+	 cyc_i <= 1;
+	 @(negedge clk);
+	 while (ack_o == 0) begin
+	    @(negedge clk);
+	 end
+	 data_out <= dat_o;
+	 adr_i <= 0;
+	 stb_i <= 0;
+	 cyc_i <= 0;
+      end
+   endtask // write_wb
+
+   initial begin
+      @(negedge clk);    
+      rst <= 1;
+      repeat(10) @(negedge clk);
+      rst <= 0;
+      repeat(10) @(negedge clk);
+      write_wb(4'h0620,SUART_CLKDIV);
+      repeat(10) @(negedge clk);
+      read_wb(read_data,SUART_TXLEVEL);
+      repeat(10) @(negedge clk);
+   end // initial begin
+   
+   
+   
+   simple_uart
+     #(.CLKDIV_DEFAULT(16'd0))
+   simple_uart_i
+     (
+      .clk_i(clk),
+      .rst_i(rst),
+      .we_i(we_i),
+      .stb_i(stb_i),
+      .cyc_i(cyc_i),
+      .ack_o(ack_o),
+      .adr_i(adr_i),
+      .dat_i(dat_i),
+      .dat_o(dat_o),
+      .rx_int_o(rx_int_o),
+      .tx_int_o(tx_int_o), 
+      .tx_o(tx_o), 
+      .rx_i(rx_i),
+      .baud_o(baud_o)
+      );
+
+   
+
+endmodule // simple_uart_tb