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fixed-point in simvision

wangyunxin

Delta_ V1 delta_ V2 delta_ V3 are all 20 bit signals, but in my Verilog code, they are processed as signed fixed-point numbers, with 1 sign bit, 4 integer bits, and 15 decimal bits. So he is actually a real number between -10 and+10, but simvision's radius can only be set to binary decimal, as shown in the above figure. I can only see its decimal value now. How can I set the form of its fixed-point number to facilitate my debugging? My simvision version is also in the picture

  • Yes this can be done in SimVision by creating an "expression" from the original signal. You can either do it manually, or load the attached Tcl widget in order to get a helper GUI.

    Also please note in regard to your follow-up posts - this forum is NOT intended for official customer support processes and there is no gaurantee that you will get an answer here. If you need timely help you should login to https://support.cadence.com/ and use the search facility in the first instance - the majority of support questions are answered that way. If you still can't find what you need, please use the support page to file a support request.

    https://community.cadence.com/cfs-file/__key/communityserver-discussions-components-files/30/fixed_5F00_point.tcl

  • in reply to StephenH

    Hi  ,after I click the website https://support.cadence.com/.It prompts me that I need to fill in the host id.And after I filled in the host id.it prompts me that University users cannot self-register. Please contact your University Program Representative or Customer Support for registration assistance. Can university users use this website?

  • in reply to StephenH

    Hi StephenH, I'm having some problems using the script you gave me. For example, I now want to convert the variable fix_target_vload4_signed into a fixed-point decimal. It is a 20-bit number. If it is an unsigned decimal number, its value is 39320, and its decimal places are from 14 bits to 0 bits, totaling 15 bits. So in fact its value is 39320/2^15 which is approximately equal to 1.2

    When I use the script you gave me, I set the MSB to 19, the LSB to 0, and the Fraction Bits to 14. The result he returned is indeed 3.9e-10, which is obviously very different from 1.2. What is the correct way to use it?
    Many thanks

  • in reply to wangyunxin

    Please can you email me from your university email address so that I can put you in touch with the local university programme coordinator (and get you signed up for the support site). My email is my forum name @cadence.com.

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