Visible to Intel only — GUID: pyp1489538066476
Ixiasoft
Visible to Intel only — GUID: pyp1489538066476
Ixiasoft
1.15.3. FAST_INPUT_REGISTER
Implements an input register in a cell that has a fast, direct connection from an I/O pin. If such a fast, direct connection from the I/O pin is not available on the I/O cell hardware, this option instructs the Fitter to lock the input register in the LAB adjacent to the I/O cell feeding it. Turning on the Fast Input Register option can help maximize I/O timing performance, for example, by permitting fast setup times. Turning this option off for a particular signal prevents the Fitter from implementing the signal automatically in an I/O cell or locking down the input register in the LAB adjacent to the I/O cell. This option is ignored if it is applied to anything other than a register or an input or bidirectional pin that feeds a register.
Type
Boolean
Device Support
- Arria 10
- Arria GX
- Arria II GX
- Arria II GZ
- Arria V
- Arria V GZ
- Cyclone
- Cyclone 10 LP
- Cyclone II
- Cyclone III
- Cyclone III LS
- Cyclone IV E
- Cyclone IV GX
- Cyclone V
- A
- E
- HardCopy II
- HardCopy III
- HardCopy IV
- MAX 10
- MAX II
- MAX V
- MAX7000A
- MAX7000AE
- MAX7000B
- MAX7000S
- Mercury
- Stratix
- Stratix GX
- Stratix II
- Stratix II GX
- Stratix III
- Stratix IV
- Stratix V
Notes
This assignment supports Fitter wildcards.
Syntax
set_instance_assignment -name FAST_INPUT_REGISTER -to <to> -entity <entity name> <value>