diff options
Diffstat (limited to 'docs/constraints.md')
| -rw-r--r-- | docs/constraints.md | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/docs/constraints.md b/docs/constraints.md index 4917b33f..dead8780 100644 --- a/docs/constraints.md +++ b/docs/constraints.md @@ -13,9 +13,9 @@ and the ECP5 architecture supports a subset of LPF constraints (for details see LOCATE COMP "led[0]" SITE "E16"; IOBUF PORT "led[0]" IO_TYPE=LVCMOS25; - IOBUF ... DRIVE=8; + IOBUF ... DRIVE=4|8|12|16; // currently LVCMOS33 and LVCMOS33D only IOBUF ... OPENDRAIN=ON|OFF; - IOBUF ... TERMINATION=50; + IOBUF ... TERMINATION=50|75|150; IOBUF ... DIFFRESISTOR=100; //for differential IO only IOBUF ... CLAMP=ON|OFF; IOBUF ... PULLMODE=UP|DOWN|NONE; |