我正在尝试在Vivado上编写几个正方形，然后将代码发送到与VGA电缆相连的Basys 3板上以显示正方形。我没有遇到合规/位流错误。谁能弄清楚我的代码有什么问题？
模块vga640x480（ 输入导线i_clk，//基本时钟 输入线i_pix_stb，//像素时钟选通脉冲 输入线i_rst，//重置：重新启动帧 输出线o_hs，//水平同步 输出线o_vs，//垂直同步 输出线o_blanking，//在消隐期间为高 输出线o_active，//在激活像素绘制期间为高 输出线o_screenend，//在屏幕末尾高电平一刻 输出线o_animate，//在活动图形结束时为一勾高 输出线[9：0] o_x，//当前像素x位置 输出线[8：0] o_y //当前像素y的位置 ）;
localparam HS_STA = 16; // horizontal sync start
localparam HS_END = 16 + 96; // horizontal sync end
localparam HA_STA = 16 + 96 + 48; // horizontal active pixel start
localparam VS_STA = 480 + 10; // vertical sync start
localparam VS_END = 480 + 10 + 2; // vertical sync end
localparam VA_END = 480; // vertical active pixel end
localparam LINE = 800; // complete line (pixels)
localparam SCREEN = 525; // complete screen (lines)
reg [9:0] h_count; // line position
reg [9:0] v_count; // screen position
// generate sync signals (active low for 640x480)
assign o_hs = ~((h_count >= HS_STA) & (h_count < HS_END));
assign o_vs = ~((v_count >= VS_STA) & (v_count < VS_END));
// keep x and y bound within the active pixels
assign o_x = (h_count < HA_STA) ? 0 : (h_count - HA_STA);
assign o_y = (v_count >= VA_END) ? (VA_END - 1) : (v_count);
// blanking: high within the blanking period
assign o_blanking = ((h_count < HA_STA) | (v_count > VA_END - 1));
// active: high during active pixel drawing
assign o_active = ~((h_count < HA_STA) | (v_count > VA_END - 1));
// screenend: high for one tick at the end of the screen
assign o_screenend = ((v_count == SCREEN - 1) & (h_count == LINE));
// animate: high for one tick at the end of the final active pixel line
assign o_animate = ((v_count == VA_END - 1) & (h_count == LINE));
always @ (posedge i_clk)
begin
if (i_rst) // reset to start of frame
begin
h_count <= 0;
v_count <= 0;
end
if (i_pix_stb) // once per pixel
begin
if (h_count == LINE) // end of line
begin
h_count <= 0;
v_count <= v_count + 1;
end
else
h_count <= h_count + 1;
if (v_count == SCREEN) // end of screen
v_count <= 0;
end
end
endmodule
模块顶部（ 输入线CLK，//板时钟：Arty / Basys3 / Nexys上的100 MHz 输入线RST_BTN，//重置按钮 输出线VGA_HS_O，//水平同步输出 输出线VGA_VS_O，//垂直同步输出 输出线[3：0] VGA_R，// 4位VGA红色输出 输出线[3：0] VGA_G，// 4位VGA绿色输出 输出线[3：0] VGA_B // 4位VGA蓝色输出 ）;
线rst = RST_BTN; // Basys3（BTNC）上的复位高电平有效
wire [9:0] x; // current pixel x position: 10-bit value: 0-1023
wire [8:0] y; // current pixel y position: 9-bit value: 0-511
wire animate; // high when we're ready to animate at end of drawing
// generate a 25 MHz pixel strobe
reg [15:0] cnt = 0;
reg pix_stb = 0;
always @(posedge CLK)
{pix_stb, cnt} <= cnt + 16'h4000; // divide by 4: (2^16)/4 = 0x4000
vga640x480 display (
.i_clk(CLK),
.i_pix_stb(pix_stb),
.i_rst(rst),
.o_hs(VGA_HS_O),
.o_vs(VGA_VS_O),
.o_x(x),
.o_y(y),
.o_animate(animate)
);
wire sq_a, sq_b, sq_c;
wire [11:0] sq_a_x1, sq_a_x2, sq_a_y1, sq_a_y2; // 12-bit values: 0-4095
wire [11:0] sq_b_x1, sq_b_x2, sq_b_y1, sq_b_y2;
wire [11:0] sq_c_x1, sq_c_x2, sq_c_y1, sq_c_y2;
square #(.IX(160), .IY(120), .H_SIZE(60)) sq_a_anim (
.i_clk(CLK),
.i_ani_stb(pix_stb),
.i_rst(rst),
.i_animate(animate),
.o_x1(sq_a_x1),
.o_x2(sq_a_x2),
.o_y1(sq_a_y1),
.o_y2(sq_a_y2)
);
square #(.IX(320), .IY(240), .IY_DIR(0)) sq_b_anim (
.i_clk(CLK),
.i_ani_stb(pix_stb),
.i_rst(rst),
.i_animate(animate),
.o_x1(sq_b_x1),
.o_x2(sq_b_x2),
.o_y1(sq_b_y1),
.o_y2(sq_b_y2)
);
square #(.IX(480), .IY(360), .H_SIZE(100)) sq_c_anim (
.i_clk(CLK),
.i_ani_stb(pix_stb),
.i_rst(rst),
.i_animate(animate),
.o_x1(sq_c_x1),
.o_x2(sq_c_x2),
.o_y1(sq_c_y1),
.o_y2(sq_c_y2)
);
assign sq_a = ((x > sq_a_x1) & (y > sq_a_y1) &
(x < sq_a_x2) & (y < sq_a_y2)) ? 1 : 0;
assign sq_b = ((x > sq_b_x1) & (y > sq_b_y1) &
(x < sq_b_x2) & (y < sq_b_y2)) ? 1 : 0;
assign sq_c = ((x > sq_c_x1) & (y > sq_c_y1) &
(x < sq_c_x2) & (y < sq_c_y2)) ? 1 : 0;
assign VGA_R[3] = sq_a; // square a is red
assign VGA_G[3] = sq_b; // square b is green
assign VGA_B[3] = sq_c; // square c is blue
endmodule