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Altera_Forum
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16 years ago

Stratix II Configuration Problem

Hi, We are having some issues configuring a stratix II FPGA. From quartus we can successfully program the flash from Quartus but the FPGA does not always configure correctly when power is applied....
Altera_Forum's avatar
Altera_Forum
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16 years ago

Apologies, file now attached.

As for the clarifications:

1. Yes the FPGA always configures when conf done is probed. (without this it will not configure properly)

2. We havn´t analysed the signal integrity in any great detail, we have only verified that clock and data are as expected, but will look into this in the morning.

3. We are using fast active serial, I dont think we can try slow as the MSEL pins are hardwired apart from one.

4. Yes n_config is pulled high, it seems to be behaving as expected. I initially thought that the other FPGA may have been pulling it low briefly after configuration but this appears not to be the case.

5. At the moment we don´t have any concerns about the grounding, as we followed the recomendations of the datasheet. What type of problems are yout thinking of?

The differences between the boards are the following:

The working board does not have the cyclone III FPGA, but in theory this should not affect operation, as the resistors are configured only to configure the FPGA from the flash. Other than that there are not any other differences that I can think off that could affect configuration, but I´ll post back if I think of anything.

Many thanks for the help