Answers Database
QuickSim II: Output of XBLOX BUS_IFxx component is X
Record #2069
Product Family: Software
Product Line: Mentor
Product Part: quicksim II
Problem Title:
QuickSim II: Output of XBLOX BUS_IFxx component is X
Problem Description:
Urgency: Standard
General description:
In a functional simulation in QuicksimII of a design that contains XBLOX
components, the outputs of BUS_IF (bus interface) symbols, such as
BUS_IF16, are X (unknown) even thoough the input is a valid logic value.
Solution 1:
This is caused when the bounded side of the BUS_IFxx component is driven by
an XBLOX INPUTS symbol with a BOUNDS=0:0 attribute applied to it.
To fix this remove the BOUNDS and ENCODING attributes from the INPUTS
instance. If the INPUTS symbol is connected to a single NET, then
XBLXGS/XBLOX will infer a single bit width, and thus the BOUNDS attribute is
not necessary.
End of Record #2069 - Last Modified: 05/24/99 10:47 |
