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Cadence RTL Compiler: read_tcf vs read_vcd

Cadence RC 9.1

I do a gate-level simulation for a design and I capture both VCD file and TCF file for it. here is simple script for IUS:

>> probe -create -vcd testbench.dut -all -depth all

>> dumptcf -scope testbench:dut -overwrite -output tcf/01.tcf

>> run 1000ns

>> dumptcf -end

now I load the design in RC environment and I read switching activities using both of the commands

read_tcf works well, but read_vcd fails to perform assertions correctly.

Why?

>> read_tcf ../NC/tcf/01.tcf

-------------------------------------------------------
Asserted Primary inputs in design              : 74 (100.00%)
Total connected primary inputs in design       : 74 (100.00%)
-------------------------------------------------------
Asserted sequential outputs          : 500 (100.00%)
Total connected sequential outputs   : 500 (100.00%)
-------------------------------------------------------
Total nets in design                 : 49760 (100.00%)
Nets asserted                        : 49640 (99.76%)
Clock nets                           : 0 (0.00)
Constant nets                        : 74 (0.15)
Nets with no assertions              : 120 (0.24%)
-------------------------------------------------------

read_vcd -vcd_module dut -module top -static -start_time 0 -end_time 1000000 ../NC/ncsim.vcd

---------------------------------------------------------------
Asserted primary inputs in design         : 74 (100.00%)
Total connected primary inputs in design : 74 (100.00%)
---------------------------------------------------------------
Asserted sequential outputs               : 39 (7.80%)
Total connected sequential outputs        : 500 (100.00%)
------------------------------------------------------------------------------------
Total nets in design                      : 49760 (100.00%)
Nets asserted                             : 497 (1.00%)
Constant nets                             : 74 (0.15)
Nets with no assertions                   : 49263 (99.00%)
------------------------------------------------------------------------------------

grasshopper over 13 years ago

Hi Mamsadegh,
a number of issues in VCD reader have been addressed since 9.1. I suggest you download 11.1-USR1 or later from http://downloads.cadence.com which in all likelihood address your issues
regards,
gh-
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