//对图像矩阵数据的计算共耗时5个周期，
//所以要将控制信号延时5个周期
always@(posedge clk or negedge rst_n) begin
if(!rst_n) begin
matrix_frame_vsync_dly <= 0;
matrix_frame_href_dly <= 0;
matrix_frame_clken_dly <= 0;
end
else begin
matrix_frame_vsync_dly <= { matrix_frame_vsync_dly[3:0] , matrix_frame_vsync };
matrix_frame_href_dly <= { matrix_frame_href_dly[3:0] , matrix_frame_href };
matrix_frame_clken_dly <= { matrix_frame_clken_dly[3:0] , matrix_frame_clken };
end
end
结论：
1：每一次非阻塞赋值（<=）都需要一个时钟上升沿clk才能完成
2：{ matrix_frame_clken_dly[3:0] , matrix_frame_clken };逻辑运算不消耗c时间，当作瞬间完成
3：
matrix_frame_vsync_dly <= { matrix_frame_vsync_dly[3:0] , matrix_frame_vsync };
matrix_frame_vsync_dly <= matrix_frame_vsync_dly【0】
matrix_frame_vsync_dly <= matrix_frame_vsync_dly【1】
matrix_frame_vsync_dly <= matrix_frame_vsync_dly【2】
matrix_frame_vsync_dly <= matrix_frame_vsync_dly【3】
matrix_frame_vsync_dly <= matrix_frame_vsync_dly【4】总共经过5歌clk，延迟打5拍
没有回复内容