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Question & Answer
Classification:
Date: Oct 29, 1999
Using larger EEPROMs in an XS40 Board
Q:
I use the XS40-010XL V1.2 Board. The XC4010XL FPGA requires a bitstream that is too large to store in an Atmel 17C256 EEPROM. I'd like to build an adaptor that allows me to use the AT17C512 EEPROM, which has a PLCC20 socket, in the DIP8 socket of the board. Moreover my adapter would allow to have a fully compatible programming of the EEPROM (in particular for the configuration of the /RESET-OE pin). Does the XSLOAD software let me generate a bitstream whose length is more than 256 Kbits?
A:
XSLOAD will probably work as long as the ATC512 uses the same programming format as the AT17C256. I've checked the source code and it allows programming files up to 128 KBytes in length, so a 512 Kbit = 64 KBytes file will be OK. If you do encounter problems, we make the source code for the XSTOOLs library available on our web site at http://www.xess.com/xstools-source-3_0.zip .