Answers Database

MAKEBITS, MAKEPROM v5.2: bit file and prom file size may differ from that generated with v5.1/5.0 software.


Record #960

Product Family:  Software

Product Line:  FPGA Core

Problem Title:
MAKEBITS, MAKEPROM v5.2:  bit file and prom file size may differ from
that generated with v5.1/5.0 software.



Problem Description:
The size of the bit files and mcs prom files that are generated with Makebits
 and Makeprom v5.2 may be of slightly larger file size (usually 2 bytes), due
to a change in the default options when moving from v5.1 to v5.2.

The -lc option's default has changed as follows:

Makebits, Makeprom v5.1 --> -lc=aligned_done
Makebits, Makeprom v5.2 --> -lc=aligned_lc

This will alter the length count, and thus the size of the file.  This can
create problems for users who have previously written code to generate
configuration data for peripheral mode configuration, and this code is
expecting the mcs file to be of a particular length.


Solution 1:

To generate a bit file and prom file which match those generated with the
v5.1 software, run BOTH makebits and makeprom with the -lc=aligned_done
option.

Makebits -lc=aligned_done [other options] <design>.lca
Makeprom -lc=aligned_done [other options] <design>.bit



End of Record #960