Re: spartan-3e spi problems

On 29 Jul., 02:52, jon...@xxxxxxxxx wrote:
On Jul 28, 12:31 pm, Antti <Antti.Luk...@xxxxxxxxxxxxxx> wrote:





On 28 Jul., 00:56, jon...@xxxxxxxxx wrote:

Hi,
I am having trouble configuring a xc3s250e from a st m25pe20 spi
flash rom. Originally init would not go low and the chip was
constantly looping through the config. I inserted a 256 0xFF's at the
beginning of the mcs file and now init goes low, but done does not go
high. Is there some number of 0's or 1's that need to be appended to
the image. I am using xilinx ise 9.1. I generated the mcs file using
impact and selected the generic SPI options. I have tried bit-swapping
the file. Init only goes low one way. The last line of my prom image
is:

:1094F00020000000200000002000000020000000EC

I have heard of a postamble that should be 0x7F, this file doesn't
have one though.

Thanks,

Jon Pry

init going low during means ERROR
init not going low, done not asserting means that configuration not
even started

init is low for short time after power-on, if it doesnt go high means
FPGA
is really not in working condition (INIT=1 means its ready for conf)

Antti

Init pulses high. I can see that the fpga has downloaded the
configuration and stops downloading it presumably when the correct
number of bytes have been transferred. I'm pretty sure it is in the
"ERROR" condition. I don't know why though.- Zitierten Text ausblenden -

- Zitierten Text anzeigen -

connect JTAG cable at least temporarly and read back the status
register, it should hold the error bits hopefully

init low error is either CRC or wrong device ID

Antti







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