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Howto include a text-file (eg. S-parameters or LRCG file) in a library and track its location automatically for netlisting ?

I am currently developping symbols for use in EMC simulations. For example models of cables and bulk-current injection coils.

The cables are unshielded twisted pairs described by frequency-dependent RLCG parameters in a text file.

For the BCI coils, I need to use a 1-port described by S-parameters. See attachment for snapshot of the schematic of the coil model.

I want to release those cells as symbols and schematics in a library. However the mtline or the nport component require the absolute path of the file to be specified. I would like to store the text files inside the directory structure of the library, and make sure that whenever the library is moved as a whole the netlisting will still be such that the correct files are loaded by nport or mtline.

I would like to minimize the customisation effort and if possible not do custom netlisting. I was wondering if I could use a custom AEL function to automatically fill in the library path in the CDF field when netlisting ?

Parents

Andrew Beckett over 15 years ago

I've been meaning to reply to this for a while, just didn't have the chance to get my code adapted and tested.

Anyway, here's some SKILL to solve this. See the comments at the top which explain what you need to do to get an nport which allows you to refer to a s-parameter file contained within a lib/cell/view.

/* abNportFromViewProc.il

Author     A.D.Beckett
Group      Custom IC (UK), Cadence Design Systems Ltd.
Language   SKILL
Date       Oct 08, 2009 
Modified   
By         

A customized netlist procedure to specify the s-parameter file from
a lib/cell/view combination. Typically the referenced view will be
a "text" view.

To set up, copy nport from analogLib into your own library, then
edit the Base CDF:

Add these parameters:

sparamLib  - string - parseAsCEL=no, parseAsNumber=no
sparamCell - string - parseAsCEL=no, parseAsNumber=no
sparamView - string - parseAsCEL=no, parseAsNumber=no

Remove the file parameter

In the spectre simInfo, remove file from otherParameters, and add
sparamLib sparamCell sparamView. Change the netlist procedure to
abNportFromViewProc

***************************************************

SCCS Info: @(#) abNportFromViewProc.il 10/08/09.16:28:54 1.1

*/

defun(abNportFromViewProc (inst)
    let((formatter netlister numPins sparamLib sparamCell sparamView 
	ddId)
	;------------------------------------------------------------
	; get hold of the formatter and netlister objects
	;------------------------------------------------------------
	formatter=nlGetFormatter(inst)
	netlister=nlGetNetlister(formatter)
	nlPrintInstComments(formatter inst)
	nlPrintInstName(formatter inst)
	;------------------------------------------------------------
	; Get information about the nport
	;------------------------------------------------------------
	numPins=atoi(nlGetParamStringValue(inst "p"))
	sparamLib=nlGetParamStringValue(inst "sparamLib")
	sparamCell=nlGetParamStringValue(inst "sparamCell")
	sparamView=nlGetParamStringValue(inst "sparamView")
	;------------------------------------------------------------
	; Netlist the variable number of pins
	;------------------------------------------------------------
	nlPrintString(netlister " (")
	for(pin 1 numPins
	    nlPrintString(netlister 
		strcat(
		    nlGetTerminalSignalName(inst sprintf(nil "p%d" pin))
		    " "
		    nlGetTerminalSignalName(inst sprintf(nil "m%d" pin))
		    " "
		)
	    )
	)
	nlPrintString(netlister ")")
	nlPrintModelName(formatter inst)
	;------------------------------------------------------------
	; Output the path to the s-parameter file in the 
	; s-parameter view
	;------------------------------------------------------------
	nlPrintInstParameters(formatter inst)
	ddId=ddGetObj(
	    sparamLib
	    sparamCell
	    sparamView
	    "*"
	    )
	when(ddId
	    nlPrintString(netlister " file=\"")
	    nlPrintString(netlister ddId~>readPath)
	    nlPrintString(netlister "\"")
	)
    ))

Regards,

Andrew.

Reply

Andrew Beckett over 15 years ago

I've been meaning to reply to this for a while, just didn't have the chance to get my code adapted and tested.

/* abNportFromViewProc.il

Author     A.D.Beckett
Group      Custom IC (UK), Cadence Design Systems Ltd.
Language   SKILL
Date       Oct 08, 2009 
Modified   
By         

A customized netlist procedure to specify the s-parameter file from
a lib/cell/view combination. Typically the referenced view will be
a "text" view.

To set up, copy nport from analogLib into your own library, then
edit the Base CDF:

Add these parameters:

sparamLib  - string - parseAsCEL=no, parseAsNumber=no
sparamCell - string - parseAsCEL=no, parseAsNumber=no
sparamView - string - parseAsCEL=no, parseAsNumber=no

Remove the file parameter

In the spectre simInfo, remove file from otherParameters, and add
sparamLib sparamCell sparamView. Change the netlist procedure to
abNportFromViewProc

***************************************************

SCCS Info: @(#) abNportFromViewProc.il 10/08/09.16:28:54 1.1

*/

defun(abNportFromViewProc (inst)
    let((formatter netlister numPins sparamLib sparamCell sparamView 
	ddId)
	;------------------------------------------------------------
	; get hold of the formatter and netlister objects
	;------------------------------------------------------------
	formatter=nlGetFormatter(inst)
	netlister=nlGetNetlister(formatter)
	nlPrintInstComments(formatter inst)
	nlPrintInstName(formatter inst)
	;------------------------------------------------------------
	; Get information about the nport
	;------------------------------------------------------------
	numPins=atoi(nlGetParamStringValue(inst "p"))
	sparamLib=nlGetParamStringValue(inst "sparamLib")
	sparamCell=nlGetParamStringValue(inst "sparamCell")
	sparamView=nlGetParamStringValue(inst "sparamView")
	;------------------------------------------------------------
	; Netlist the variable number of pins
	;------------------------------------------------------------
	nlPrintString(netlister " (")
	for(pin 1 numPins
	    nlPrintString(netlister 
		strcat(
		    nlGetTerminalSignalName(inst sprintf(nil "p%d" pin))
		    " "
		    nlGetTerminalSignalName(inst sprintf(nil "m%d" pin))
		    " "
		)
	    )
	)
	nlPrintString(netlister ")")
	nlPrintModelName(formatter inst)
	;------------------------------------------------------------
	; Output the path to the s-parameter file in the 
	; s-parameter view
	;------------------------------------------------------------
	nlPrintInstParameters(formatter inst)
	ddId=ddGetObj(
	    sparamLib
	    sparamCell
	    sparamView
	    "*"
	    )
	when(ddId
	    nlPrintString(netlister " file=\"")
	    nlPrintString(netlister ddId~>readPath)
	    nlPrintString(netlister "\"")
	)
    ))

Regards,

Andrew.

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