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Altera_Forum
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14 years ago

Cyclone III stuck at POR?

Hi, I have problems to get a custom board work, the FPGA seems to be stuck in POR. It's a PCIe card with a EP3C10F256C7N. I attached an excerpt of the schematic to this post. I have 10 pro...
Altera_Forum's avatar
Altera_Forum
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14 years ago

The POR circuit keeps the device in the reset state until the power supply voltage levels have stabilized after device power-up. After device power-up, the device does not release nSTATUS until the required voltages listed in Table 9-4 on page 9-8 are above the POR trip point of the device.

For the Cyclone III, voltage that must be powered-up are VCCINT, VCCA, VCCIO (for the banks in which the configuration and JTAG pins reside)

In my application I have the following voltages:

VCCINT 1.2 (actual is 1.209)

VCCA 2.5 (actual is 2.508)

VCCIO 3.3 (actual is 3.255)

So, I believe I have the voltages required.