On Feb 7, 8:29 am, taco <
[email protected]> wrote:
> We are want to use a spartan 3E in the very small chip scale package because
> of space constraints. However the 4 MBit serial prom for this device is
> almost the same size as the whole fpga. Does anybody know of an alternative
> which is much smaller?
> Taco Walstra
> University of Amsterdam
1) Don't know how much this helps, but if you're using the
3S500E and don't fill the part up too much, your bitstream
can fit into a 2 Mbit prom if you compress it. Banking on
that however can lead to problems if your design expands and
the compressed bitstream grows over the 2 Mbit boundary.
2) Do you have some other storage available that could be
shared to with the bitstream data? A microcontroller
with attached flash? A 120 Gbyte hard drive attached
via the host system interface? Or does your
FPGA need to
come up running without any support from software?
3) Any chance of using a Lattice XP2 in the 132-ball csBGA
instead (no external prom required)?