在 $readmemh 命令中,如何指定从起始地址读取到结束地址。

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英文:

In $readmemh command, how to specify to read from a starting address to ending address

问题

我有一个 360x640 的矩阵,即 230,400 个像素值。使用 $readmemh,我想读取矩阵的特定部分并将其存储在矩阵 Y_luma 中(仅读取正方形框内的 8x8 矩阵值,即从 154 到 148 并存储在 Y_luma 矩阵的第一行,从 152 到 153 存储在 Y_luma 矩阵的第二行,以此类推,直到从 155 到 152 存储在 Y_luma 的第八行)。

我尝试的代码是:

module matrix_copy;

    reg [7:0] Y_luma [0:7][0:7];

    $readmemh("Luma_space.txt", Y_luma,

接下来的步骤不清楚。如何指定起始地址,即 [8][8],以及结束地址,即 [8][15]Y_luma 的第一行,以及如何将下一个数组从 [9][8][9][15] 存储在 Y_luma 的第二行,以此类推?

帮助将不胜感激!

英文:

I have a 360x640 matrix i.e. 230,400 pixel values. Using $readmemh, I want to read only a specific part of matrix and store it in matrix Y_luma (read only the 8x8 matrix values inside the square box i.e. from 154 to 148 and store it in first row of matrix Y_luma, from 152 to 153 store in 2nd row of matrix Y_luma and so on until 155 to 152 in 8th row of Y_luma).

在 $readmemh 命令中,如何指定从起始地址读取到结束地址。

The code I tried is:

module matrix_copy;

	reg [7:0] Y_luma [0:7][0:7];
	
	$readmemh("Luma_space.txt", Y_luma,

Not able to proceed afterwards. How to specify the start address i.e. [8][8] and stop address i.e. [8][15] in first row of matrix Y_luma and also, how to store the next array from [9][8] to [9][15] in 2nd row of matrix Y_luma and so on?

Help is appreciated!

答案1

得分: 1

以下是翻译好的部分:

一种方法是声明另一个内存变量,其大小与输入文件的大小完全匹配,并将整个文件读入该内存(地址范围为0至230,399)。然后,您可以使用 for 循环有选择地加载您的 Y_luma 变量。

reg [7:0] mem [360*640];
initial $readmemh("Luma_space.txt", mem);

这可以避免有关内存大小不正确的错误或警告消息。

还可以参考 IEEE Std 1800-2017,第21.4.3节“多维未打包数组的文件格式考虑”。但这可能要求您的输入文件采用非常特定的格式,可能包含地址条目(@0)。

$readmemh 函数确实具有可选的 start_addrfinish_addr 参数,但要使它们与您的配置一起正常工作可能有点棘手。

这是一个可选参数的示例

英文:

One approach is to declare another memory variable which exactly matches the size of the input file and read the entire file into that memory (addresses 0 to 230,399). Then you can use for loops to selectively load your Y_luma variable.

reg [7:0] mem [360*640];
initial $readmemh("Luma_space.txt", mem);

This avoids any error or warning messages about incorrect memory size.

Also refer to IEEE Std 1800-2017, section 21.4.3 File format considerations for multidimensional unpacked arrays. However, it might require that your input file be in a very specific format, perhaps with address entries (@0).

$readmemh does have optional start_addr and finish_addr arguments, but it might be tricky getting them to work with your configuration.

Here is one example of the optional arguments.

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  • 本文由 发表于 2023年5月11日 19:04:39
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