Student @ University of Science and Technology of China
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Computer Organization and Design course of 2019
License: MIT License
Student @ University of Science and Technology of China
这个always块里对变量vc的处理似乎有问题:
`
always @(posedge clk) begin
if (rst) begin
hc <= 0;
vc <= 0;
end else if (ce) begin
if (hc >= HD + HF + HS + HB - 1)
hc <= 0;
else begin
hc <= hc + 1;
if (vc >= VD + VF + VS + VB - 1)
vc <= 0;
else
vc <= vc + 1;
end
end
end`
从这个代码我理解出的意思,是每次clk上升沿触发时,若满足条件使hc加1,则vc未到最大值时也会加1。但vc应该在hs低电平信号后才加1,也就是至少hc达到HD+HF+HS(即扫描完一行同步)后才会加1。
我的想法是这样的:
`
always @(posedge clk,posedge rst) begin
if (rst) begin
hc <= 0;
end else if (ce) begin
if (hc >= HD + HF + HS + HB - 1)
hc <= 0;
else begin
hc <= hc + 1;
end
end
end
always @(posedge hs,posedge rst) begin
if (rst) begin
vc <= 0;
end else if (ce) begin
if (vc >= VD + VF + VS + VB - 1)
vc <= 0;
else begin
vc <= vc + 1;
end
end
end
`
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