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Altera_Forum's avatar
Altera_Forum
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16 years ago

EPCS read problem

Hello All,

I have a problem with a access to the EPCS .

I have a NIOS design with epcs controller. My SW use the altera_avalon_epcs_flash_controller. My HW is a “NiosII Development Board Cyclon (1C20)” and a “NiosII Development Board CyclonII (2C35)”.

My design SW is QuartusII 9.0 and 9.1.

1) I load the design with JTAG to the HW I can read an write from/to the EPCS

2) I program this design to EPCS and load from this I can read and write from/to the EPCS

3) I program this design to parallel FLASH and load from this I can NOT read the EPCS. The access to EPCS is not possible. The return value of alt_epcs_flash_init is -19 the return value is -22 if OK. The EPCS is unrealized.

This problem is with both Quartus versions and both EVA boards.

Why cannot read EPCS if design is load from parallel Flash?

Kind regards

weibu

2 Replies

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

    There was an issue when both CFI and EPCS were present and included in SOPC, but that was a couple of years ago Quartus 6

    There was a "workaround" as we had used both at the same time, fpga image from cfi and EPCS available for access to store another image + SW + user data
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    I have not understood this completely. What I must do with it I can read from the EPCS.

    Thanks

    weibu