opening a data file using an ocean script

[mialee]

ocean script

hi!
I'm doing an ocean script of a two stage opamp with dimensions as variables,and an octave script to obtein those dimensions (using a "design flow").The octave script prints its outputs(dimensions of each transistor and value of the miller capacitor) in an output file (octave_out),these values are going to be used in the ocean script (for simulations in order to verify if i aproach the specs).

My question is,what do i need to write in the ocean script to open the octave_out and read it?

I tried using load("octave_out.ocn") but i had an error,besides i dont know what i have to do to relate the values of octave_out (values:w1,w2,w3....w8,Cc) with the Ws of the transistors of the netlist,I mean,i know that i want it to replace those values in the places where i put w1,w2....w8,Cc (variables) in the netlist but i dont know if the ocean script is going to take it in that way,maybe i need something that link these variables with those values.

I hope you guys can help me :S

 

[JoannesPaulus]

ocean script reference

you can use the "infile" and "fscanf" commands as follows:

Your octave_out file contains"
"w1" 1u
"w2" 2u
...

Your ocean script:
fid = infile("octave_out");
fscanf( fid "%s %d" a b );
desVar(a b);
close(fid);

 

[mialee]

ocean script example

thanks for replying,sorry but i dont know what you mean with a and b,

 

[JoannesPaulus]

ocean scripting opening

a and b are just two variables used to read the input data file.

 

[mialee]

ocean script

sorry again,i realized that,i tried what you recommended and it didn't work,could you tell me please how fscanf works? I have an ocean manual (ocean reference) but it's not clear,it shows an example for a file with just a line,i don't know if fscanf reads line by line,the whole file,or...i don't get it.
i try to read each line of octave_out and replace each value of w1...w8 and Cc and Rc for the variables in the netlist using a for

fid=infile("octave_out")
analysis('ac ?start "1m" ?stop "5G")
temp(27)
for(i 1 10
fscanf(fid "%s %f" a b)
desVar("a" b)
)
close(fid)
run()
PM = phaseMargin(VF("/net7"))
GBW = gainBwProd(VF("/net7"))
dc_gain=value(dB20(VF("/net7")) 0)

Maybe the for is not necessary,It's really important for me to know how to do this.I hope you can help me (or somebody else).

 

[JoannesPaulus]

variables in ocean script

It works for me...

... I just realized that in the octave_data file you should have:

w1 1e-6
w2 2e-6
...

and not as I said in my previous post:
"w1" 1u
"w2" 2u
...

Moreover, you need to set the path to your netlist using the command:
design( <YOUR NETLIST PATH> )

So, here is the script.

----------------------------------------------
simulator( 'spectre )
design( "~/TEST/netlist")

analysis('ac ?start "1m" ?stop "5G")

fid=infile("octave_out")
for(i 1 10
fscanf(fid "%s %f" a b)
desVar(a b)
)
close(fid)

resultDir("~/TEST/")
run()

selectResults( 'ac)
PM = phaseMargin(VF("/net7"))
GBW = gainBwProd(VF("/net7"))
dc_gain=value(dB20(VF("/net7")) 0)

----------------------------------------------

I haven't tried the bottom 3 lines but you need to select what results you want to read!

I hope this helps!

 

[mialee]

specifying path for ocean scripts

hey! thanks a lot!

it really works,i don't know why it didn't before :s (maybe i was too tired)
It was just a little part of an ocean script that I'm doing.I hope you don't mind that I keep doing this kind of questions.

Thanks again

 

[mialee]

script ocean

Hi again! i'm doing some scripts in ocean and octave,

the data (dimensions of transistors) is calculated,then is written in an output file (octave_output) and read for my ocean script,i want to do all this automatically,i mean, when octave_output is written in some way my ocean script (which has the analysis and the outputs that i want it to print in an ocean output file) has to "know" that the data is ready to be read and run the simulations.

I hope someone can help me with this.

 

[Goldeneagle]

fscanf next line ocean

Key in both the script commands in a simple file .. say something like this ...

<Script one> <arguements for script1>
<Script Two> <arguements for script2>

save the file and source it !!! if you want u can key in some print statements(use print or echo) in ur scripts which flags the error whenever the file is not created...