Answers Database
FPGA COMPILER: PULLUPs/PULLDOWNs must be instantiated when using Synopsys.
Record #564
Product Family: Software
Product Line: Synopsys
Product Part: FPGA Compiler
Product Version: 3.3a
Problem Title:
FPGA COMPILER: PULLUPs/PULLDOWNs must be instantiated when using Synopsys.
Problem Description:
Can PULLUPs and PULLDOWNs be inferred or do they have to be instantiated ?
Solution 1:
PULLUP and PULLDOWN components may be inferred on pad connections of input and
output cells. These I/O cells have attributes that allow you to infer PULLUP or PULLDOWN
resistors using the set_pad_type command in Synopsys tools.
For example, to attach a PULLUP resistor to an input port named INPUT1, type:
set_pad_type -pullup INPUT1
Internal PULLUPs must be INSTANTIATED, they cannot be inferred.
End of Record #564 - Last Modified: 12/29/95 11:55 |
