diff options
Diffstat (limited to 'rtl/src/testbench/tb_demo_adder.v')
| -rw-r--r-- | rtl/src/testbench/tb_demo_adder.v | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/rtl/src/testbench/tb_demo_adder.v b/rtl/src/testbench/tb_demo_adder.v new file mode 100644 index 0000000..5abbf06 --- /dev/null +++ b/rtl/src/testbench/tb_demo_adder.v @@ -0,0 +1,173 @@ +`timescale 1ns / 1ps
+
+module tb_demo_adder;
+
+ //
+ // Inputs
+ //
+ reg gclk;
+ wire gclk_p = gclk;
+ wire gclk_n = ~gclk;
+ reg reset_mcu_b;
+
+ //
+ // Outputs
+ //
+ wire led;
+
+ //
+ // EIM
+ //
+ reg eim_cs_n;
+ reg eim_bclk;
+ reg eim_lba_n;
+ wire [15: 0] eim_da;
+ reg [15: 0] eim_da_out;
+ reg eim_da_drive;
+ reg eim_oe_n;
+ reg eim_wr_n;
+ wire eim_wait_n;
+
+ assign eim_da = (eim_da_drive == 1'b1) ? eim_da_out : {16{1'bZ}};
+
+ //
+ // UUT
+ //
+ novena_baseline_top uut
+ (
+ .gclk_p_pin (gclk_p),
+ .gclk_n_pin (gclk_n),
+
+ .eim_bclk (eim_bclk),
+ .eim_cs0_n (eim_cs_n),
+ .eim_da (eim_da),
+ .eim_lba_n (eim_lba_n),
+ .eim_wr_n (eim_wr_n),
+ .eim_oe_n (eim_oe_n),
+ .eim_wait_n (eim_wait_n),
+
+ .reset_mcu_b_pin (reset_mcu_b),
+
+ .led_pin (led_pin),
+ .apoptosis_pin (apoptosis_pin)
+ );
+
+ //
+ // CLK2 (50 MHz)
+ //
+ always #10 gclk = ~gclk;
+
+ //
+ // Initialize EIM
+ //
+ initial begin
+ eim_cs_n = 1'b1;
+ eim_bclk = 1'b0;
+ eim_lba_n = 1'b1;
+ eim_da_out = {16{1'bX}};
+ eim_da_drive = 1'b1;
+ eim_oe_n = 1'b1;
+ eim_wr_n = 1'b1;
+ end
+
+ //
+ // Test Logic
+ //
+ reg [31: 0] eim_rd = {32{1'bX}};
+
+ initial begin
+ gclk = 1'b0;
+ reset_mcu_b = 1'b1;
+ //
+ #2000;
+ //
+ eim_write({12'h321, 2'd0, 2'b00}, 32'hAA_55_A5_A5); // write X
+ #100;
+ eim_write({12'h321, 2'd1, 2'b00}, 32'h11_22_12_12); // write Y
+ #100;
+ eim_read( {12'h321, 2'd3, 2'b00}, eim_rd); // read {STS, CTL} <-- should be 0x0000_0000
+ #100;
+ eim_rd = eim_rd + 1'b1;
+ eim_write({12'h321, 2'd3, 2'b00}, eim_rd); // write {STS, CTL} <-- STS is ignored by adder
+ #100;
+ eim_read( {12'h321, 2'd3, 2'b00}, eim_rd); // read {STS, CTL} <-- should be 0x0001_0001
+ #100;
+ eim_read( {12'h321, 2'd2, 2'b00}, eim_rd); // read Z <-- should be 0xBB77B7B7
+ end
+
+ //
+ // Write Access
+ //
+ integer wr;
+ task eim_write;
+ input [15: 0] addr;
+ input [31: 0] data;
+ begin
+ #15 eim_cs_n = 1'b0;
+ eim_lba_n = 1'b0;
+ eim_da_out = addr;
+ eim_wr_n = 1'b0;
+ #15 eim_bclk = 1'b1;
+ #15 eim_bclk = 1'b0;
+ eim_lba_n = 1'b1;
+ eim_da_out = data[15:0];
+ #15 eim_bclk = 1'b1;
+ #15 eim_bclk = 1'b0;
+ eim_da_out = data[31:16];
+ #15 eim_bclk = 1'b1;
+ #15 eim_bclk = 1'b0;
+ eim_da_out = {16{1'bX}};
+ while (eim_wait_n == 1'b0) begin
+ #15 eim_bclk = 1'b1;
+ #15 eim_bclk = 1'b0;
+ end
+ #15 eim_cs_n = 1'b1;
+ eim_wr_n = 1'b1;
+ #30;
+ end
+ endtask;
+
+
+ //
+ // Read Access
+ //
+ task eim_read;
+ input [15: 0] addr;
+ output [31: 0] data;
+ begin
+ #15 eim_cs_n = 1'b0;
+ eim_lba_n = 1'b0;
+ eim_da_out = addr;
+
+ #15 eim_bclk = 1'b1;
+
+ #15 eim_bclk = 1'b0;
+ eim_lba_n = 1'b1;
+ eim_oe_n = 1'b0;
+ eim_da_drive = 1'b0;
+ #15;
+ while (eim_wait_n == 1'b0) begin
+ eim_bclk = 1'b1;
+ #15 eim_bclk = 1'b0;
+ #15;
+ end
+ eim_bclk = 1'b1;
+ #15 eim_bclk = 1'b0;
+ #15 eim_bclk = 1'b1;
+ data[15: 0] = eim_da;
+ #15 eim_bclk = 1'b0;
+ #15 eim_bclk = 1'b1;
+ data[31:16] = eim_da;
+ #15 eim_bclk = 1'b0;
+ eim_da_out = {16{1'bX}};
+
+ #15 eim_cs_n = 1'b1;
+ eim_oe_n = 1'b1;
+ eim_da_drive = 1'b1;
+ #30;
+ end
+ endtask;
+
+
+endmodule
+
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