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