xilinx_7series: add grade platform property.
authorwhitequark <cz@m-labs.hk>
Thu, 10 Oct 2019 16:25:10 +0000 (16:25 +0000)
committerwhitequark <cz@m-labs.hk>
Thu, 10 Oct 2019 16:33:00 +0000 (16:33 +0000)
commitf4eb1d44669c6d8917dbd4c254b444d64b48296e
tree61659c74505e0cd0d389e4ea6b956ae156cdc20c
parenta03a99f490fd05ebdeed3bedc605426c6ef85805
xilinx_7series: add grade platform property.

For some devices grade has to be omitted, so it is optional.
nmigen/vendor/xilinx_7series.py