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Altera_Forum's avatar
Altera_Forum
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14 years ago

JTAG Bahvior is Different from EPCS4

Hi all, I have a DE1 board. I design a circuit, very simple circuit with one 8-bit counter. It has a PLL in it too. The PLL generates 50 MHz input clock and bring it down to 10 MHz.

When I program DE1-Cyclone II with JTAG, it works fine. When I load the design into EPCS4, and recycle power, the circuit stops working? Any idea. I run sims, it works fine too.

The PLL has a reset, but it does not matter in this case as I suspect the PLL is not working at all when power up from EPCS4.

Thanks.

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    Hi,

    1) Do you have a explicit reset in your counter ?

    2) Do you check you output configuration for epcs ? I mean there may be a problem with your epcs : program file or design. I suspect program file (.pof).

    3) Else...
  • Altera_Forum's avatar
    Altera_Forum
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    14 years ago

    You are right. The pof file is corrupted. I am using Quartus II 9.1 SP2. It has a bug in generating pof file. Thanks. I have had this problem before, but almost forget about it now.