Answers Database
C_IP2, V2.1i COREGEN: Virtex Variable Parallel Multiplier module latency does not match the 4K (XC4000) version of the core
Record #7393
Product Family: Software
Product Line: LogiCore
Product Part: Coregen IP Modules
Problem Title:
C_IP2, V2.1i COREGEN: Virtex Variable Parallel Multiplier module latency does not match the
4K (XC4000) version of the core
Problem Description:
Urgency: standard
General Description:
The Virtex Variable Parallel Multiplier shipped in the C_IP2 release
has one clock latency less than the 4K version, even it is generated
with both the Pipelined and Registered Output options enabled.
This is because the inputs of the 4K multipliers in the CORE Generator
(the Parallel Area OptimizedMultipliers) are registered by default, and
there is no option for registering the inputs in the Virtex version of the
module.
Solution 1:
If you are trying to convert a 4K CORE Generator multiplier to a CORE
Generator Variable Parallel Multiplier for Virtex and need to maintain
the same latency, you must explicitly register the inputs of the Variable
Parallel Multiplier in your design.
End of Record #7393 - Last Modified: 08/27/99 19:48 |
