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Using $sformat in Verilog AMS

Devin Atkin

I feel I may be losing my mind, and I can't find any reference to what I'm doing wrong. I've tried a few different approaches and referred to the language reference. I'm trying to load a series of files one after another to provide test values for an image sensor design. I need to assemble the name of each frame so that I can load it with file operations. I was able to load a single frame and simulate no problems. However, when I start having to assemble the file names I run into issues and I feel like there has to be a simple solution to the problem. 

`include "constants.vams"
`include "disciplines.vams"

module Video (light[0:4095]);
    parameter integer width = 64;
    parameter integer height = 64;
    parameter real MAX_VALUE = 1e-9;

    //The number of frames available
    parameter integer frame_max = 279;

    //Folder and filename structure of the frames of the video
    parameter string folder_name = "video_csv";
    parameter string file_name_base = "video_framenumber";

    output [0:4095]light;

    string file_name;

    // Current Frame being output
    integer frame_counter = 0;

    electrical [0:4095] light;

    analog
    begin

        @(initial_step)
        begin
                   
            $sformat(file_name, "%s.csv",folder_name);
        end

    end
endmodule
When I run the testbench I end up getting the following error.
Recompiling... reason: file './video_images.vams' is newer than expected.
expected: Tue May 23 16:12:52 2023
actual: Tue May 23 16:39:34 2023
2023/05/23 16:39:57 System is not a supported distribution
2023/05/23 16:39:57 An error occurred. We don't recognize OS
2023/05/23 16:39:57 WARNING This OS does not appear to be a Cadence supported Linux configuration.
2023/05/23 16:39:57 For more info, please run CheckSysConf in <cdsRoot/tools.lnx86/bin/checkSysConf <productId>
file: ./video_images.vams
sprintf(file_name, "%s.csv",folder_name);
|
xmvlog: *E,BADSTMT (./video_images.vams,42|52): statement not allowed inside analog block [6.1(AMSLRM)].
module worklib.Video:vams
errors: 1, warnings: 0
xrun: *E,VLGERR: An error occurred during parsing. Review the log file for errors with the code *E and fix those identified problems to proceed. Exiting with code (status 1).
TOOL: xrun(64) 21.03-s002: Exiting on May 23, 2023 at 16:39:59 MDT (total: 00:00:03)
Any help or even a direction to go with debugging this would be greatly appreciated. 
Parents

  • The error message you show doesn't correspond to the code you have posted. It's complaining about a line with sprintf (your code doesn't have sprintf anywhere), and also without the dollar. The code compiles without any problem if you use $sformat. 

    However, there's a further issue that the simulator won't find the $sformat system task. It seems that this has not yet been implemented in the analog context - there's a change request, CCR 1540139, asking for this. You might want to contact customer support (submit a case after logging in) and request that a duplicate is filed on your behalf.

    As a workaround, you could set the file name in the digital context:

    `include "constants.vams"
`include "disciplines.vams"

module Video (light[0:4095]);
    parameter integer width = 64;
    parameter integer height = 64;
    parameter real MAX_VALUE = 1e-9;

    //The number of frames available
    parameter integer frame_max = 279;

    //Folder and filename structure of the frames of the video
    parameter string folder_name = "video_csv";
    parameter string file_name_base = "video_framenumber";

    output [0:4095]light;

    string file_name;

    // Current Frame being output
    integer frame_counter = 0;

    electrical [0:4095] light;

    initial begin
            $sformat(file_name, "%s.csv",folder_name);
    end

    analog
    begin

        @(initial_step)
        begin
	    $strobe("File is ",file_name);
                   
//            $sformat(file_name, "%s.csv",folder_name);
        end

    end
endmodule

    Andrew

Reply

  • The error message you show doesn't correspond to the code you have posted. It's complaining about a line with sprintf (your code doesn't have sprintf anywhere), and also without the dollar. The code compiles without any problem if you use $sformat. 

    However, there's a further issue that the simulator won't find the $sformat system task. It seems that this has not yet been implemented in the analog context - there's a change request, CCR 1540139, asking for this. You might want to contact customer support (submit a case after logging in) and request that a duplicate is filed on your behalf.

    As a workaround, you could set the file name in the digital context:

    `include "constants.vams"
`include "disciplines.vams"

module Video (light[0:4095]);
    parameter integer width = 64;
    parameter integer height = 64;
    parameter real MAX_VALUE = 1e-9;

    //The number of frames available
    parameter integer frame_max = 279;

    //Folder and filename structure of the frames of the video
    parameter string folder_name = "video_csv";
    parameter string file_name_base = "video_framenumber";

    output [0:4095]light;

    string file_name;

    // Current Frame being output
    integer frame_counter = 0;

    electrical [0:4095] light;

    initial begin
            $sformat(file_name, "%s.csv",folder_name);
    end

    analog
    begin

        @(initial_step)
        begin
	    $strobe("File is ",file_name);
                   
//            $sformat(file_name, "%s.csv",folder_name);
        end

    end
endmodule

    Andrew

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