analysis

Andrew,

Everything works fine. Thanks.

Another question: 

In ocean, how can i save the all corners simualtion results in a directory and retrieveit later? I tried to plot the from result brower, but it only save the last run.   

y 

Why not just use something like:

sprintf(myResultsDir "/xxx%s_%d%g" corner temp iled)

Regards,

Andrew.

Andrew,

This works, however the file name doesnt match the variables used. 

sprintf(myResultsDir "/xxx%s_%d%g" corner temp iled) 

 I have to use  sprintf(myResultsDir "/xxx%s_%d%g" corner y1 y2) instead. In this case the file name matches the variable.

 Any reason why? 

Andrew,

I want to print my output as follows:

corner temp iled i differential_psrr etc etc
tt_lib    -40   1m 1u 60.34  xx xx  

I tried to use fprintf instead of ocnPrint. Simulation completed without error, however there is no data in the output file. There is no problem using ocnPrint, just need to organise it a bit in excel.

This is what i use:

fprintf(out "corner\ttemp\tiled\ti\tdifferential_psrr\n")

fprintf(out "%s\t%d\t%g\t%g\t%g\%g\n") 

Also, I have quite a bit of expressions, how can i output the data in a more efficient manner?

y 

yeong said:

 I have to use  sprintf(myResultsDir "/xxx%s_%d%g" corner y1 y2) instead. In this case the file name matches the variable.

 Any reason why? 

This is because the SKILL variables in your script are called y1 and y2. I wasn't looking at your previous code when I replied - I assumed you had SKILL variables (not design variables, which correspond to spectre parameters) called iled and temp etc.

Regards,

Andrew.

yeong said:

fprintf(out "%s\t%d\t%g\t%g\t%g\%g\n") 

If this is what you are using, it ought to fail with an error, because there are no arguments corresponding to each % keyword in the formatting string. 

Andrew.

sorry, i forgot to include the arguments in the post.

fprintf(out "%s\t%d\t%g\t%g\t%g\%g\n" corner temp y1 y2 differential_psrr ) 

the arguments as declared in the script previously.

this is the script. simulation runs fine, but no data in test.txt

ocnWaveformTool('wavescan )
simulator( 'spectre )
out=outfile("test.txt" "w")
design(     "/xxx/spectre/schematic/netlist/netlist")
;resultsDir( "/xxx/spectre/schematic" )
analysis('ac ?start "1"  ?stop"1G"  ?dec "50"  )
analysis('dc ?saveOppoint t  )
desVar(       "cap_factor" 1  )
desVar(       "iled" 16m      )
desVar(       "i" 848u  )
option(     'temp  "150.0" 
)
saveOption( 'subcktprobelvl "5" )
temp( 150.0 ) 
myCors=list("ff_lib" "tt_lib" "ss_lib")
foreach(corner myCors
modelFile(
list("/xxx.scs" corner)
)
foreach(y1 '(150)
temp(y1)
foreach(y2 '(1m 10m)
desVar("iled" y2)
foreach(y3 '(1u 5u)
desVar("i" y3)

sprintf(myResultsDir "/xxx%s_%d%g" corner y1 y2) 
run()

differnetial_psrr = dB20((VF("/psrr") - VF("/ref")))
plot( differnetial_psrr ?expr '( "differnetial psrr" ) )
differential_psrr_3dB_BW = cross(dB20(VF("/psrr")) (value(dB20(VF("/psrr"))1) + 3) 1 "either" nil nil)
;plot( differential_psrr_3dB_BW ?expr '( "differential_psrr_3dB BW" ))
differential_psrr_dB_DC = value(dB20((VF("/psrr") -VF("/ref"))) 1)
;plot( differential_psrr_dB_DC ?expr '( "differential_psrr_dB_DC" ))
differential_psrr_dB_max = ymax(dB20((VF("/psrr") -VF("/ref"))))
ctr = VAR("ctr")
iled = VAR("iled")

fprintf(out "corner\ttemp\tiled\ti\tdifferential_psrr\n")
fprintf(out "%s\t%d\t%g\t%g\t%g\%g\n" corner temp iled y3 differential_psrr )

))))

y 

Probably this is because you're not closing the file. In SKILL (as in many other languages), writing ASCII files is buffered (for efficiency reasons) so that it doesn't flush to disk until the buffer is full (or when the file is closed).

So two choices:

1. Call close(out) at the end (in fact you should do this anyway to avoid having lots of open file handles lying around)
2. If you want the output to update more frequently (for example, so that you can see the file contents during a loop where running the simulations takes some time), you can flush the buffers by calling drain(out)

Regards,

Andrew.