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Altera_Forum's avatar
Altera_Forum
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16 years ago

Problem with feedback connection

Hi everyone,

I have make a simply firmware in dsp builder but have some problem in feedback connection. If i run a simulation in simulink I haven't any kind of problem, these arise after the download in FPGA.

I have another answer: The divider block have a particular latency???

The operations frequency of first part of firmware is 300MHz, this is a problem with the bus width of someone data??? I attach the file model of simulink that i have created for test purpose, please control it and give me any kind of information about my error.

Thanks for your attention and sorry for my english.

Bye bye :cool:

6 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    In my ipinion,your clock divider needs dealing.Dew to a time question.

  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    Hi, thanks for this hint but the problem isn't the clock divider but the arithmetic operand divider, and a feedback on the subtractor.

    Bye byw
  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    Hi everyone, maybe I'm not clear about the trouble founded in the test model create by me via DSP BUILDER.

    I have two questions:

    1) If the firmware work @300MHz the latency of block divider is less than the clock period??

    2) There are some possible truble about a feedback connection in the subtractor node???

    I make this two answer because i haven't considerate the divider latency in test project and i think that there is no problem in feedback connection but when i "program" FPGA i found out of the subtractoru 1 e -1 instead of 0.

    Again thanks for attention and sorry for my english.

    Bye Bye at all
  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

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    come from china ?

    --- Quote End ---

    what???? But why you have maked this answer?????????:confused:
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    --- Quote Start ---

    what???? But why you have maked this answer?????????:confused:

    --- Quote End ---

    i am sorry i just guess