Encore SIM EDITOR SOFTWARE User's Guide Page 410

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17-26
VCD+ (vpd) File Generation
+vpdignore to ignore $vcdplus calls in code
The +vpdignore command instructs the simulator to ignore any
$vcdplusxx calls and license checking. By default, the simulator
checks out a VCD+ PLI license if there is a $vcdplusxx in the Verilog
source. In some cases, this statement is never executed and VCD+
PLI license checkout should be suppressed. The +vpdignore
command performs the license suppression.
Syntax:
+vpdignore
+vpddrivers to store driver information
By default, VCD+ records value changes only for the resolved value
for each net. To also report value changes for all its drivers when there
are more than one driver, use the +vdpdrivers option when simulating.
The driver values, for example, enable the Logic Browser to identify
which drivers produce an undesired X on the resolved net.
This option affects performance and memory usage for larger designs
or longer runs.
Syntax:
+vpddrivers
+vpdports to store port information
By default, VCD+ does not store the port type for each signal, and
the Hierarchy Browser views all signals as internal and not connected
to a port.
The +vpdports option causes VCD+ to store port information, which
is then used by the Hierarchy Browser to show whether a signal is a
port and if so its direction. This option to some extent affects
simulation initialization time and memory usage for larger designs.
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