# fsdb2vcd conversion for bit signals -> vector

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#### pgbackup

##### Newbie level 6
I am using fsdb2vcd version:
fsdb2vcd - fsdb to vcd converter, Release 2011.04 (Linux x86_64/64bit) 03/31/2011
Copyright (C) 1996 - 2011 by SpringSoft, Inc.

My problem is as follows. I have a FSDB trace that contains signal names like this \foo[0], \foo[1], \foo[2] … In nWave, they show up as \foo[2:0] which is great. Now, I want to convert this FSDB trace to a VCD (or EVCD if possible) trace. However, rather than having \foo[0], \foo[1], \foo[2], I want the VCD trace to have foo[2:0]. That is, I want to combine the scalar bits to a vector. I tried using the –consolidate_bus option as follows:

fsdb2vcd test.fsdb –o test.vcd –consolidate_bus

However, in the generated test.vcd, I got the following:

$var tri 1 O4 foo [0]$end
$var tri 1 P4 foo [1]$end
$var tri 1 Q4 foo [2]$end

So the –consolidate_bus option doesn’t seem to be working. I thought maybe the \ (escape sequence was a problem). So I tried FSDB -> VCD (to get above, without escape sequence) -> FSDB (using vcd2fsdb) -> VCD (fsdb2vcd –consolidate_bus). But that also doesn’t seem to work.

Can you please tell me how the –consolidate_bus option works? Is it possible to convert scalar bit signals to vectors?

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