Digital vector file

By "Digital Vector File" I assume you mean a file used for digital stimulus with Spectre? If so, the best place is to read the documentation. 

By "Digital Vector File" I assume you mean a file used for digital stimulus with Spectre? If so, the best place is to read the documentation. 

thank you for the response , well i am talking about the .vec file . if there are less number of input then it is easier to write the tabular vector data. However i have 1024 inputs in my schematics (i.e 1024 rows) which i want to turn on 1 by 1 .

Does i need to write  1000000 upto 1024

                                   01000000 upto 1024

for Vname I1 I2 I3 I4.....................................................I1024

is there anyway or i have to write it manually all?

sorry for my english.  i am talking about this file(  https://www.bioee.ee.columbia.edu/courses/cad/html/vec.html)

well i am talking about .vec file in ultrasim.

it is easier to write the tabular vector data for lesser number of input . However if  my schematic has 1024 input then does i manually need to write

1 vname I1 I2 I3...........upto  I1024

2  tabular format

   10000000000...upto 1024

   010000000....... upto 1024 bit and so on

   001000000......

is there any other way . but ir is difficult to write for large number of input

A couple of ways - you could use a digital stimulus block in this case (written in Verilog) and then do a mixed-signal simulation. That digital stimulus block would then just be a 1024 bit shift register, and that would be very easy to code - simpler than a flat file.

Or you could do a digital simulation of such a shift register (using xrun in XCELIUM) and save a VCD file, and then use a VCD input instead for your spectre simulation.

Having to hand-produce a vector file which only has a single bit enabled is going to be cumbersome of course. That said, writing a simple python or perl script to generate it wouldn't exactly be difficult either.

Andrew

THANK YOU, is there no  way in the vector file to compress that long bit pattern ?

You could do it in hexadecimalso so that will make the bit patterns 4 times shorter at least.

Andrew 

 yea it has save my time. thank you @Andrew Beckett                                                                              

In my schematic i have given input via vector file, However i have given some  some dc input directly in the schematics. when i am checking its transient node voltage for that given dc input , it is showing "?" . do i have to give all  the inputs  through vector file only if i am using ultrasim or some other problem is there?

I'm not sure what you mean by 'showing "?"', but you can't set an input both with a DC source and a vector file as these would be conflicting.

Andrew

I should clarify - you don't have to specify all inputs through the vector file, but for any input specified in the vector file you cannot also drive it by a voltage source on the schematic.

Andrew