英文:
Inside an always@(posedge clk) block, having a nested for loop, how do we output for each and every values of i and j?
问题
To achieve the desired output, you can add a condition to check for specific values of i and j before displaying the result. Here's the modified code:
integer i, j;
reg [15:0] Y_Planar_Prediction_reg; // Register to store Y_Planar_Prediction
always @(posedge clk) begin
for (j = 0; j < 16; j = j + 1) begin
for (i = 0; i < 16; i = i + 1) begin
Y_pred_h = (16 - 1 - i) * Y_ref_buffer_left[j] + (i + 1) * Y_ref_buffer_top_right;
Y_pred_v = (16 - 1 - j) * Y_ref_buffer_top[i] + (j + 1) * Y_ref_buffer_left_bottom;
Y_Planar_Prediction = (Y_pred_h + Y_pred_v + 16) >> (4 + 1);
// Check for specific i and j values
if (i == 0 && j == 0) begin
Y_Planar_Prediction_reg <= Y_Planar_Prediction;
$display("@%dns Y_Planar_Prediction for i=0, j=0: %d", $time, Y_Planar_Prediction_reg);
end
else if (i == 1 && j == 0) begin
Y_Planar_Prediction_reg <= Y_Planar_Prediction;
$display("@%dns Y_Planar_Prediction for i=1, j=0: %d", $time, Y_Planar_Prediction_reg);
end
else if (i == 2 && j == 0) begin
Y_Planar_Prediction_reg <= Y_Planar_Prediction;
$display("@%dns Y_Planar_Prediction for i=2, j=0: %d", $time, Y_Planar_Prediction_reg);
end
// Add more conditions for other values of i and j as needed
end
end
end
This modified code checks for specific values of i and j and displays the Y_Planar_Prediction result with the corresponding time and values of i and j. You can extend this pattern for other values of i and j as required.
英文:
Code
integer i,j;
//Luma
always @(posedge clk)
begin
for (j=0; j<16; j=j+1)
begin
for (i=0; i<16; i=i+1)
begin
Y_pred_h = (16-1-i) * Y_ref_buffer_left[j] + (i+1) * Y_ref_buffer_top_right;
Y_pred_v = (16-1-j) * Y_ref_buffer_top[i] + (j+1) * Y_ref_buffer_left_bottom;
Y_Planar_Prediction = (Y_pred_h + Y_pred_v + 16 ) >> (4+1);
end
end
end
Here Y_Planar_Prediction is my module output, and I need to display its result on screen for each and every value of i and j in every posedge of clk (i.e for i=0,j=0 at time=15; i=1,j=0 at time=25; i=2,j=0 at time=35;.....; i=5,j=10 at time=something; ..........; i=15,j=15 at time=something)
But, when I simulate observing the output for only i=15,j=15 (i.e 158) in every posedge of clk.
Attached screenshot for reference:
How can i modify the code to get:
@15ns Y_Planar_Prediction for i=0,j=0;
@25ns Y_Planar_Prediction for i=1,j=0;
@35ns Y_Planar_Prediction for i=2,j=0;
and so on...
答案1
得分: 1
Verilog中的for循环只是一种编写简洁代码的便捷方式。i和j变量只是循环索引，其值在一个模拟时间步骤内更改。模拟的行为符合预期。这不是for循环的正确用法。
看起来你确实希望i和j推断计数器的逻辑，而不是使用for循环。在这种情况下，你需要添加新的always块。例如：
reg [3:0] icnt;
always @(posedge clk) begin
if (icnt_en) icnt <= icnt + 1;
end
这样，icnt将在每个时钟周期上具有新的值。
英文:
for loops in Verilog are merely a convenient way to write concise code. The i and j variables are just loop indexes whose values change in a single simulation time step. The simulation is behaving as expected. This is not a proper use of for loops.
It seems like you really want i and j to infer logic of counters instead of using for loops. In that case you would need to add new always blocks. For example:
reg [3:0] icnt;
always @(posedge clk) begin
if (icnt_en) icnt <= icnt + 1;
end
In this way, icnt will have a new value on each clock cycle.
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