I have a PCB with two XC2S100 FPGAs dasy-chained and a setup to configure these devices a couple of different ways. I have been successful at configuring the chain using JTAG and have used this method to finish the development of my firmware. I am now trying to use a single XC17S200A OTP to configure the chain on power-up, but it doesn’t seem like the design is being loaded onto the FPGAs.
I have attached a schematic of the connections relevant to configuration and here are some details about the design:
* I am using Xilinx WebPACK 10.1 to generate a programming file for each Spartan II device
* Configuration Options: Default (pull ups on configuration pins)
* Startup Options: Default (Enable Internal Done Pipe – Not selected, FPGA Start-Up Clock – CCLK, DriveDone pin High – Not selected)
* I am using the PROM File Formatter from IMPACT to generate a single .mcs file from two .bit files (following the procedure to add devices):
Calculating PROM checksum with fill value ff
Format Mcs86 (32-bit)
Size 205K
PROM start 0000:0000
PROM end 0003:33ff
PROM checksum 00f26762
Addr1 Addr2 Date File(s)
0000:0000 0002:faf7 Sep 26 13:36:34 2011 C:/Documents and Settings/K_Enriquez/XILINX Projects/PLC_REM_IO_1TEST/rem104ch.bit
Sep 27 14:24:28 2011 C:/Documents and Settings/K_Enriquez/XILINX Projects/PLC_REM_IO_2/rem104ch.bit
* I am using an ADVIN PILOT programmer. After selecting the correct PROM from the device list, I load the .mcs file and select a HEX format. I also select the option to program the RESET polarity to active low.
* The device checksum after verification matches the PROM file checksum reported in the .prm file
This is the first time I try to configure a daisy-chain from a PROM, so I am not sure if I am missing a setting when I generate the .mcs file or if I need to use a different format. In a previous post somebody mentioned that changing the format from HEX to Binary solved the problem. Is this right?
If the setup I have is correct, my next step is to put a scope on the configuration pins to see if this is a hardware or signal integrity problem. What is the best place to start when doing this?
Thanks in advance.
