diff options
Diffstat (limited to 'control_lib/giantfifo_tb.v')
| -rw-r--r-- | control_lib/giantfifo_tb.v | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/control_lib/giantfifo_tb.v b/control_lib/giantfifo_tb.v new file mode 100644 index 000000000..87ecd97ae --- /dev/null +++ b/control_lib/giantfifo_tb.v @@ -0,0 +1,173 @@ +module fifo_tb(); + + localparam WIDTH = 36; + reg clk, rst; + wire short_full, short_empty, long_full, long_empty, giant_full, giant_empty; + wire casc_full, casc_empty, casc2_full, casc2_empty; + reg read, write; + + wire [WIDTH-1:0] short_do, long_do, casc_do, casc2_do, giant_do; + reg [WIDTH-1:0] di; + + reg clear = 0; + + shortfifo #(.WIDTH(WIDTH)) shortfifo + (.clk(clk),.rst(rst),.datain(di),.dataout(short_do),.clear(clear), + .read(read),.write(write),.full(short_full),.empty(short_empty)); + + longfifo #(.WIDTH(WIDTH), .SIZE(4)) longfifo + (.clk(clk),.rst(rst),.datain(di),.dataout(long_do),.clear(clear), + .read(read),.write(write),.full(long_full),.empty(long_empty)); + + cascadefifo #(.WIDTH(WIDTH), .SIZE(4)) cascadefifo + (.clk(clk),.rst(rst),.datain(di),.dataout(casc_do),.clear(clear), + .read(read),.write(write),.full(casc_full),.empty(casc_empty)); + + cascadefifo2 #(.WIDTH(WIDTH), .SIZE(4)) cascadefifo2 + (.clk(clk),.rst(rst),.datain(di),.dataout(casc2_do),.clear(clear), + .read(read),.write(write),.full(casc2_full),.empty(casc2_empty)); + + wire [17:0] RAM_D; + wire [18:0] RAM_A; + wire RAM_CLK, RAM_WEn, RAM_LDn, RAM_CE1n, RAM_OEn, RAM_CENn; + + giantfifo #(.WIDTH(WIDTH)) giantfifo + (.clk(clk),.rst(rst),.datain(di),.dataout(giant_do),.clear(clear), + .read(read),.write(write),.full(giant_full),.empty(giant_empty), + .RAM_D(RAM_D),.RAM_A(RAM_A),.RAM_CE1n(RAM_CE1n),.RAM_CENn(RAM_CENn), + .RAM_CLK(RAM_CLK),.RAM_WEn(RAM_WEn),.RAM_OEn(RAM_OEn),.RAM_LDn(RAM_LDn) + ); + + wire MODE = 1'b0; + cy1356 ram_model(.d(RAM_D),.clk(RAM_CLK),.a(RAM_A), + .bws(2'b00),.we_b(RAM_WEn),.adv_lb(RAM_LDn), + .ce1b(RAM_CE1n),.ce2(1'b1),.ce3b(1'b0), + .oeb(RAM_OEn),.cenb(RAM_CENn),.mode(MODE) + ); + + initial rst = 1; + initial #1000 rst = 0; + initial clk = 0; + always #50 clk = ~clk; + + initial di = 36'h300AE; + initial read = 0; + initial write = 0; + + always @(posedge clk) + if(write) + di <= di + 1; + + always @(posedge clk) + begin + if(short_full != long_full) + $display("Error: FULL mismatch"); + if(short_empty != long_empty) + $display("Note: EMPTY mismatch, usually not a problem (longfifo has 2 cycle latency)"); + if(read & (short_do != long_do)) + $display("Error: DATA mismatch"); + end + + initial $dumpfile("giantfifo_tb.vcd"); + initial $dumpvars(0,fifo_tb); + + initial + begin + @(negedge rst); + @(posedge clk); + repeat (10) + @(posedge clk); + write <= 1; + @(posedge clk); + write <= 0; + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + read <= 1; + @(posedge clk); + read <= 0; + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + + repeat(10) + begin + write <= 1; + @(posedge clk); + write <= 0; + @(posedge clk); + @(posedge clk); + @(posedge clk); + read <= 1; + @(posedge clk); + read <= 0; + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + end // repeat (10) + + write <= 1; + repeat (4) + @(posedge clk); + write <= 0; + @(posedge clk); + read <= 1; + repeat (4) + @(posedge clk); + read <= 0; + @(posedge clk); + + + write <= 1; + repeat (4) + @(posedge clk); + write <= 0; + @(posedge clk); + repeat (4) + begin + read <= 1; + @(posedge clk); + read <= 0; + @(posedge clk); + end + + write <= 1; + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + read <= 1; + repeat (5) + @(posedge clk); + write <= 0; + @(posedge clk); + @(posedge clk); + read <= 0; + @(posedge clk); + + write <= 1; + repeat (16) + @(posedge clk); + write <= 0; + @(posedge clk); + + read <= 1; + repeat (16) + @(posedge clk); + read <= 0; + @(posedge clk); + + repeat (10) + @(posedge clk); + $finish; + end +endmodule // longfifo_tb |