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Altera_Forum's avatar
Altera_Forum
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17 years ago

problems with pin assignments

Using the assigments file, I'm working in a simple design which contains NIOS+SRAM+Flash+UART.

I've assigned to TX a signal called HC_UART_TXD, When I run the project I can see message "Hello World" in hyperterminal.

The problem is when I try to configure RX with a signal called HC_UART_RXD, because the FPGA port of this signal is share with another signal called ~ALTERA_nCEO~. And I don't know how I can remove this error.

Error: Can't place pins assigned to pin location Pin_E18 (IOPAD_X53_Y21_N14)

Info: Pin HC_UART_RXD is assigned to pin location Pin_E18 (IOPAD_X53_Y21_N14)

Info: Pin ~ALTERA_nCEO~ is assigned to pin location Pin_E18 (IOPAD_X53_Y21_N14)

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    17 years ago

    Go to Device and Pin Options and set nCEO to be used as regular IO after config.

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

    Have you also set those pins to used as regular IO after config? Most of them come under Other Active Parallel pins

  • Altera_Forum's avatar
    Altera_Forum
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    17 years ago

    I've done this,

    nCEO --> from programming pin --> to regular I/O

    other active parallel pins --> from programming pin --> to regular I/O

    data[7..2] --> from input tristated --> to regular I/O

    Compilation was successful