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Altera_Forum
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12 years ago

Configuring 2 Cyclone III's from one EPCS16 Using 2.5V

Hello, My FPGA configuration signals an error by pulling the nStatus line down at the end of configuration and starting over (and over and over). 1. I am attempting to configure two EP3C4...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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Yes I will give the JTAG a go, but I cannot isolate the nStatus's and Config_Done's.

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That should not matter for this test.

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If one of the devices feel that it has not been configurated I will not get Config_Done going high. The Quartus programming tool will report this as an error. I do not know what nStatus will do? I will try this.

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If the first device is configured from EPCS, and the EPCS is setup to ignore CONF_DONE assertion, then it should configure the first device, and be done. CONF_DONE will not assert, but the first FPGA will be configured, and just "stalled" waiting for CONF_DONE to be released.

If you then program the second device via JTAG - while bypassing the first device - then the second device should configure and release CONF_DONE, and both devices will enter user mode.

Cheers,

Dave