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AR# 8153

2.1i COREGEN, C_IP3: Synchronous INIT control does not work when "Restrict Count" option is selected for Virtex Binary Counter


Keywords: virtex, coregen, counter, restrict, count

Urgency: hot

General Description:
There is a bug in the Virtex Binary Counter in which the logic associated with SINIT
(Synchronous Initialize) is not generated when you generate the counter with a "Count To" value specified.
(Before you can specify the "Count To" value, you must first activate the "Restrict Count"
option in the Binary Counter GUI.)

As a result of this bug, the Counter does not get initialized with the user-specified initial value
when SINIT is asserted. The bug is actually in the implementation netlist, so the symptoms
can be observed during both post-NGDBUILD and timing simulation.


As a workaround, regenerate the core with a LOAD input and use it to load the desired
initial value from the L input instead.
AR# 8153
Date 08/01/2001
Status Archive
Type General Article