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Altera_Forum's avatar
Altera_Forum
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9 years ago

all bins on tristate

Hello,

Im working on a project with MAXV

i got the pcb and soldered the cpld and it accept programming

but all the pins give different voltages 0.9 1.7 2 v

the Quartus 2 give successful build for they synthesis and the fitter

but the bins should output ground not floated with random voltage

is there any option

or something i miss

thankyou

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    9 years ago

    i tested the io banks , 1 bank works well when assign it to vcc or to gnd

    the other io bank when assigned to vcc works

    but when assigned gnd it floats
  • Altera_Forum's avatar
    Altera_Forum
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    9 years ago

    What is the package you are using? You mention it was hand soldered. Is this on a known-working PCB design, or is it a new one?

    The behavior you indicate would seem to be related to assembly and/or design, and not necessarily an FPGA programming issue per se.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    9 years ago

    its my pcb design

    after testing it should be a unconnected bank ground pins so when the input circuitry connect it to ground its float

    but i test all ground pins and all of them are connected well , dont know why, but i will do more testing

    im using 5m240zt100c5