Number of bonded IOBs: 144 out of 142 101%
There are still quite a few I/O pins left on my dev board.
I'm puzzled that it seems I can use any I/O pins but less than all of them at the same time.
Is this the case or am I missing something fundamental?
Thanks in advance,
K.
Command Line : map -p XC2S300E-pq208-6 -cm area -k 4 -c 100 -tx off Target Device : x2s300e Target Package : pq208 Target Speed : -6 Mapper Version : spartan2e -- $Revision: 1.58 $ Mapped Date : Fri Oct 31 01:02:35 2003
There are four dedicated clock pins.
Regrads, Andras Tantos
I think you will find that you have over committed the pinout of the device. For some reason this isn't always classified as a fatal error :-)
Simon
device.
Checked out the chip and there are only 146 I/O pins.
Although my user config file only said that only 123 were used, the design still had more I/O blocks than the device could bond to pins.
So even though the design could theoretically fit, if the UCF was considered, the place-and router would reject the design.
D'oh!
So I removed a load of I/O that was just redundant test signals and the software has compiled and fitted the design.
I assume its still correct.. but there have often been FPGA's which are pin bound.. that is there are more I/O's internally than there are pins.. that's why the same device fits into a TQ144 and a TQ208 with no free pins.
Simon
Have something to add? Share your thoughts — no account required.
Ask the community — no account required