rtl: update SYNC_BIT timing

redchenjs · Jul 10, 2020 · 968959f · 968959f
1 parent 812177f
commit 968959f
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Showing 9 changed files with 175 additions and 33 deletions.
diff --git a/rtl/layer_code.sv b/rtl/layer_code.sv
@@ -26,6 +26,7 @@ module layer_code(
 logic        rd_en;
 logic [ 5:0] rd_addr;
 logic [31:0] rd_data;
+logic [ 7:0] tim_sum;
 
 logic bit_rdy, bit_data, bit_done;
 
@@ -49,6 +50,7 @@ ws281x_ctrl ws281x_ctrl(
 
     .wr_done_in(wr_done_in),
     .rd_data_in(rd_data),
+    .tim_sum_in(tim_sum),
 
     .bit_rdy_out(bit_rdy),
     .bit_data_out(bit_data),
@@ -57,7 +59,7 @@ ws281x_ctrl ws281x_ctrl(
     .rd_addr_out(rd_addr)
 );
 
-ws281x_code ws281x_code(
+ws281x_conf ws281x_conf(
     .clk_in(clk_in),
     .rst_n_in(rst_n_in),
 
@@ -69,6 +71,20 @@ ws281x_code ws281x_code(
     .t1h_cnt_in(t1h_cnt_in),
     .t1l_cnt_in(t1l_cnt_in),
 
+    .tim_sum_out(tim_sum)
+);
+
+ws281x_code ws281x_code(
+    .clk_in(clk_in),
+    .rst_n_in(rst_n_in),
+
+    .bit_rdy_in(bit_rdy),
+    .bit_data_in(bit_data),
+
+    .t0h_cnt_in(t0h_cnt_in),
+    .t1h_cnt_in(t1h_cnt_in),
+    .tim_sum_in(tim_sum),
+
     .bit_done_out(bit_done),
     .bit_code_out(ws281x_code_out)
 );

diff --git a/rtl/ws281x_code.sv b/rtl/ws281x_code.sv
@@ -13,25 +13,19 @@ module ws281x_code(
     input logic bit_data_in,
 
     input logic [7:0] t0h_cnt_in,
-    input logic [7:0] t0l_cnt_in,
     input logic [7:0] t1h_cnt_in,
-    input logic [7:0] t1l_cnt_in,
+    input logic [7:0] tim_sum_in,
 
     output logic bit_done_out,
     output logic bit_code_out
 );
 
-logic [7:0] cnt_sum;
-
 logic       bit_bsy;
 logic [8:0] bit_cnt;
 
 logic bit_done, bit_code;
 
-wire [7:0] t0_sum = t0h_cnt_in + t0l_cnt_in;
-wire [7:0] t1_sum = t1h_cnt_in + t1l_cnt_in;
-
-wire cnt_done = (bit_cnt[8:0] == {cnt_sum, 1'b0} - 2'b11);
+wire cnt_done = (bit_cnt[8:0] == {tim_sum_in, 1'b0} - 2'b11);
 
 wire t0h_time = (bit_cnt[8:1] < t0h_cnt_in);
 wire t1h_time = (bit_cnt[8:1] < t1h_cnt_in);
@@ -42,16 +36,12 @@ assign bit_code_out = bit_code;
 always_ff @(posedge clk_in or negedge rst_n_in)
 begin
     if (!rst_n_in) begin
-        cnt_sum <= 8'h00;
-
         bit_bsy <= 1'b0;
         bit_cnt <= 9'h000;
 
         bit_done <= 1'b0;
         bit_code <= 1'b0;
     end else begin
-        cnt_sum <= bit_rdy_in ? (bit_data_in ? t1_sum : t0_sum) : cnt_sum;
-
         bit_bsy <= bit_bsy ? ~cnt_done : bit_rdy_in;
         bit_cnt <= bit_bsy ? bit_cnt + 1'b1 : 9'h000;
 

diff --git a/rtl/ws281x_conf.sv b/rtl/ws281x_conf.sv
@@ -0,0 +1,39 @@
+/*
+ * ws281x_conf.sv
+ *
+ *  Created on: 2020-07-10 14:29
+ *      Author: Jack Chen <redchenjs@live.com>
+ */
+
+module ws281x_conf(
+    input logic clk_in,
+    input logic rst_n_in,
+
+    input logic bit_rdy_in,
+    input logic bit_data_in,
+
+    input logic [7:0] t0h_cnt_in,
+    input logic [7:0] t0l_cnt_in,
+    input logic [7:0] t1h_cnt_in,
+    input logic [7:0] t1l_cnt_in,
+
+    output logic [7:0] tim_sum_out
+);
+
+logic [7:0] tim_sum;
+
+wire [7:0] t0_sum = t0h_cnt_in + t0l_cnt_in;
+wire [7:0] t1_sum = t1h_cnt_in + t1l_cnt_in;
+
+assign tim_sum_out = tim_sum;
+
+always_ff @(posedge clk_in or negedge rst_n_in)
+begin
+    if (!rst_n_in) begin
+        tim_sum <= 8'h00;
+    end else begin
+        tim_sum <= bit_rdy_in ? (bit_data_in ? t1_sum : t0_sum) : tim_sum;
+    end
+end
+
+endmodule
diff --git a/rtl/ws281x_ctrl.sv b/rtl/ws281x_ctrl.sv
@@ -13,6 +13,7 @@ module ws281x_ctrl(
 
     input logic        wr_done_in,
     input logic [31:0] rd_data_in,
+    input logic [ 7:0] tim_sum_in,
 
     output logic bit_rdy_out,
     output logic bit_data_out,
@@ -30,7 +31,7 @@ logic [1:0] ctl_sta;
 
 logic       bit_st;
 logic [4:0] bit_sel;
-logic [8:0] bit_syn;
+logic [8:0] bit_cnt;
 
 logic bit_rdy, bit_data;
 
@@ -42,7 +43,7 @@ wire ram_next = (bit_sel == 5'd23);
 wire ram_done = (rd_addr == 6'h00);
 
 wire bit_next = bit_st | bit_done_in;
-wire syn_done = (bit_syn[8:1] == 8'hfe);
+wire cnt_done = (bit_cnt[8:0] == {tim_sum_in, 1'b0} - 3'b110);
 
 assign bit_rdy_out  = bit_rdy;
 assign bit_data_out = bit_data;
@@ -73,14 +74,14 @@ begin
             SEND_BIT:
                 ctl_sta <= (bit_next & ram_next) ? (ram_done ? SYNC_BIT : READ_RAM) : ctl_sta;
             SYNC_BIT:
-                ctl_sta <= syn_done ? IDLE : ctl_sta;
+                ctl_sta <= cnt_done ? IDLE : ctl_sta;
             default:
                 ctl_sta <= IDLE;
         endcase
 
         bit_st  <= (ctl_sta != SEND_BIT) & ((ctl_sta == IDLE) | bit_st);
         bit_sel <= (ctl_sta == SEND_BIT) ? bit_sel + bit_next : 5'h00;
-        bit_syn <= (ctl_sta == SYNC_BIT) ? bit_syn + 1'b1 : 9'h000;
+        bit_cnt <= (ctl_sta == SYNC_BIT) ? bit_cnt + 1'b1 : 9'h000;
 
         bit_rdy  <= (ctl_sta == SEND_BIT) & bit_next;
         bit_data <= (ctl_sta == SEND_BIT) & bit_next ? rd_data[5'd23 - bit_sel] : bit_data;

diff --git a/simulation/test_layer_code.sv b/simulation/test_layer_code.sv
@@ -89,12 +89,12 @@ always begin
         wr_en_in <= 1'b1;
     #5  wr_en_in <= 1'b0;
 
-    #10 wr_done_in  <= 1'b1;
-    #5  wr_done_in  <= 1'b0;
+    #10 wr_done_in <= 1'b1;
+    #5  wr_done_in <= 1'b0;
 
     for (integer i=0; i<65536; i++) begin
-        #5 wr_done_in  <= 1'b1;
-        #5 wr_done_in  <= 1'b0;
+        #5 wr_done_in <= 1'b1;
+        #5 wr_done_in <= 1'b0;
     end
 
     #75 rst_n_in <= 1'b0;

diff --git a/simulation/test_ws281x_code.sv b/simulation/test_ws281x_code.sv
@@ -16,9 +16,8 @@ logic bit_rdy_in;
 logic bit_data_in;
 
 logic [7:0] t0h_cnt_in;
-logic [7:0] t0l_cnt_in;
 logic [7:0] t1h_cnt_in;
-logic [7:0] t1l_cnt_in;
+logic [7:0] tim_sum_in;
 
 logic bit_done_out;
 logic bit_code_out;
@@ -31,9 +30,8 @@ ws281x_code test_ws281x_code(
     .bit_data_in(bit_data_in),
 
     .t0h_cnt_in(t0h_cnt_in),
-    .t0l_cnt_in(t0l_cnt_in),
     .t1h_cnt_in(t1h_cnt_in),
-    .t1l_cnt_in(t1l_cnt_in),
+    .tim_sum_in(tim_sum_in),
 
     .bit_done_out(bit_done_out),
     .bit_code_out(bit_code_out)
@@ -48,9 +46,8 @@ initial begin
 
     // Unit: 10 ns (2 clk)
     t0h_cnt_in <= 8'h01;
-    t0l_cnt_in <= 8'h02;
     t1h_cnt_in <= 8'h02;
-    t1l_cnt_in <= 8'h01;
+    tim_sum_in <= 8'h03;
 
     #2 rst_n_in <= 1'b1;
 end
@@ -64,9 +61,11 @@ always begin
         bit_data_in <= 1'b0;
     #5  bit_rdy_in  <= 1'b0;
 
-    #50 bit_rdy_in  <= 1'b1;
-        bit_data_in <= 1'b1;
-    #5  bit_rdy_in  <= 1'b0;
+    for (integer i=0; i<10; i++) begin
+        #25 bit_rdy_in  <= 1'b1;
+            bit_data_in <= i % 2;
+        #5  bit_rdy_in  <= 1'b0;
+    end
 
     #75 rst_n_in <= 1'b0;
     #25 $stop;

diff --git a/simulation/test_ws281x_conf.sv b/simulation/test_ws281x_conf.sv
@@ -0,0 +1,73 @@
+/*
+ * test_ws281x_conf.sv
+ *
+ *  Created on: 2020-07-10 14:31
+ *      Author: Jack Chen <redchenjs@live.com>
+ */
+
+`timescale 1ns / 1ps
+
+module test_ws281x_conf;
+
+logic clk_in;
+logic rst_n_in;
+
+logic bit_rdy_in;
+logic bit_data_in;
+
+logic [7:0] t0h_cnt_in;
+logic [7:0] t0l_cnt_in;
+logic [7:0] t1h_cnt_in;
+logic [7:0] t1l_cnt_in;
+
+logic [7:0] tim_sum_out;
+
+ws281x_conf test_ws281x_conf(
+    .clk_in(clk_in),
+    .rst_n_in(rst_n_in),
+
+    .bit_rdy_in(bit_rdy_in),
+    .bit_data_in(bit_data_in),
+
+    .t0h_cnt_in(t0h_cnt_in),
+    .t0l_cnt_in(t0l_cnt_in),
+    .t1h_cnt_in(t1h_cnt_in),
+    .t1l_cnt_in(t1l_cnt_in),
+
+    .tim_sum_out(tim_sum_out)
+);
+
+initial begin
+    clk_in   <= 1'b1;
+    rst_n_in <= 1'b0;
+
+    bit_rdy_in  <= 1'b0;
+    bit_data_in <= 1'b0;
+
+    // Unit: 10 ns (2 clk)
+    t0h_cnt_in <= 8'h01;
+    t0l_cnt_in <= 8'h7f;
+    t1h_cnt_in <= 8'hfe;
+    t1l_cnt_in <= 8'h01;
+
+    #2 rst_n_in <= 1'b1;
+end
+
+always begin
+    #2.5 clk_in <= ~clk_in;
+end
+
+always begin
+    #11 bit_rdy_in <= 1'b1;
+    #5  bit_rdy_in <= 1'b0;
+
+    #10 bit_data_in <= 1'b1;
+
+    #10 bit_rdy_in <= 1'b1;
+    #5  bit_rdy_in <= 1'b0;
+
+    #75 rst_n_in <= 1'b0;
+    #25 $stop;
+end
+
+endmodule
diff --git a/simulation/test_ws281x_ctrl.sv b/simulation/test_ws281x_ctrl.sv
@@ -16,6 +16,7 @@ logic bit_done_in;
 
 logic        wr_done_in;
 logic [31:0] rd_data_in;
+logic [ 7:0] tim_sum_in;
 
 logic bit_rdy_out;
 logic bit_data_out;
@@ -31,6 +32,7 @@ ws281x_ctrl test_ws281x_ctrl(
 
     .wr_done_in(wr_done_in),
     .rd_data_in(rd_data_in),
+    .tim_sum_in(tim_sum_in),
 
     .bit_rdy_out(bit_rdy_out),
     .bit_data_out(bit_data_out),
@@ -46,7 +48,8 @@ initial begin
     bit_done_in <= 1'b0;
 
     wr_done_in <= 1'b0;
-    rd_data_in <= 32'haaaa_aaaa;
+    rd_data_in <= 32'haaaa_cccc;
+    tim_sum_in <= 8'h04;
 
     #2 rst_n_in <= 1'b1;
 end
@@ -59,7 +62,14 @@ always begin
     #11 wr_done_in <= 1'b1;
     #5  wr_done_in <= 1'b0;
 
-    for (integer i=0; i<1536; i++) begin
+    for (integer i=0; i<119; i++) begin
+        #50 bit_done_in <= 1'b1;
+        #5  bit_done_in <= 1'b0;
+    end
+
+    #500 rd_data_in <= 32'h00aa_dddd;
+
+    for (integer i=0; i<119; i++) begin
         #50 bit_done_in <= 1'b1;
         #5  bit_done_in <= 1'b0;
     end

diff --git a/ws281x_cube_controller.qsf b/ws281x_cube_controller.qsf
@@ -19,7 +19,7 @@
 #
 # Quartus Prime
 # Version 20.1.0 Build 711 06/05/2020 SJ Lite Edition
-# Date created = 10:37:22  July 09, 2020
+# Date created = 16:06:46  July 10, 2020
 #
 # -------------------------------------------------------------------------- #
 #
@@ -54,6 +54,7 @@ set_global_assignment -name SYSTEMVERILOG_FILE rtl/layer_ctrl.sv
 set_global_assignment -name SYSTEMVERILOG_FILE rtl/layer_conf.sv
 set_global_assignment -name SYSTEMVERILOG_FILE rtl/layer_code.sv
 set_global_assignment -name SYSTEMVERILOG_FILE rtl/ws281x_ctrl.sv
+set_global_assignment -name SYSTEMVERILOG_FILE rtl/ws281x_conf.sv
 set_global_assignment -name SYSTEMVERILOG_FILE rtl/ws281x_code.sv
 set_global_assignment -name SYSTEMVERILOG_FILE rtl/segment_led.sv
 set_global_assignment -name SYSTEMVERILOG_FILE rtl/pulse_counter.sv
@@ -233,6 +234,18 @@ set_global_assignment -name POWER_USE_DEVICE_CHARACTERISTICS MAXIMUM
 # end EDA_TEST_BENCH_SETTINGS(test_ws281x_ctrl)
 # ---------------------------------------------
 
+# start EDA_TEST_BENCH_SETTINGS(test_ws281x_conf)
+# -----------------------------------------------
+
+	# EDA Netlist Writer Assignments
+	# ==============================
+	set_global_assignment -name EDA_DESIGN_INSTANCE_NAME NA -section_id test_ws281x_conf
+	set_global_assignment -name EDA_TEST_BENCH_MODULE_NAME test_ws281x_conf -section_id test_ws281x_conf
+	set_global_assignment -name EDA_TEST_BENCH_FILE simulation/test_ws281x_conf.sv -section_id test_ws281x_conf
+
+# end EDA_TEST_BENCH_SETTINGS(test_ws281x_conf)
+# ---------------------------------------------
+
 # start EDA_TEST_BENCH_SETTINGS(test_ws281x_code)
 # -----------------------------------------------
 
@@ -261,6 +274,7 @@ set_global_assignment -name POWER_USE_DEVICE_CHARACTERISTICS MAXIMUM
 	set_global_assignment -name EDA_TEST_BENCH_NAME test_layer_conf -section_id eda_simulation
 	set_global_assignment -name EDA_TEST_BENCH_NAME test_layer_code -section_id eda_simulation
 	set_global_assignment -name EDA_TEST_BENCH_NAME test_ws281x_ctrl -section_id eda_simulation
+	set_global_assignment -name EDA_TEST_BENCH_NAME test_ws281x_conf -section_id eda_simulation
 	set_global_assignment -name EDA_TEST_BENCH_NAME test_ws281x_code -section_id eda_simulation
 
 # end EDA_TOOL_SETTINGS(eda_simulation)