Hi Guys,

A resistor in schematic view has 10 segments in series. In the extracted view, it becomes 10 resistor instances in series. I expect that each one has one segment. Unfortunately, each one has 10 segments now. So the resistance becomes 10 times of that in the schematic view.

The tool is Assura sub-version 4.1_USR3, IC 6.1.5.500.14.

One part of the spectre netlist of that extracted view is shown below.

Code:

    u_rdiv\|R3_9__rcx (agnd_h \4\:\#7cu_rdiv\|avC34 \#7cu_rdiv\|avC33) \
	  rpposab_3t_ckt_pcell_0 m=1 segL=7.864e-06 segW=1e-06 mismod=1 \
	  flag_cc=0
	  ...
	  subckt rpposab_3t_ckt_pcell_0 B MINUS PLUS
parameters segL=8u segW=1.5u mismod=1 flag_cc=1
    R9 (n9 MINUS B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
    R8 (n8 n9 B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
    R7 (n7 n8 B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
    R6 (n6 n7 B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
    R5 (n5 n6 B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
    R4 (n4 n5 B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
    R3 (n3 n4 B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
    R2 (n2 n3 B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
    R1 (n1 n2 B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
    R0 (PLUS n1 B) rpposab_3t_ckt l=segL w=segW mismod=mismod \
	  flag_cc=flag_cc
ends rpposab_3t_ckt_pcell_0
// End of subcircuit definition. 

Any comments are appreciated.

Best Regards,
Yawei

Hi B O E,

That is PDK of SMIC 40 low leakage process. The PDK code is SPDK40LL_1125_1TM(2TM)_OA_CDS. PDK revision is V1.4. Released on 2012-10-11.

You are right. Assura is not listed as a design platform in its release note.  :(

I should go to ask SMIC.

Best Regards,
Yawei

Hi B O E,

What's your tool? I have a solution now.

Force segments=1 with the following command in extract.rul.

segments=calculateParameter(length-length+1)
attachParameter( segments, "segments", deviceLayer)

Best Regards,
Yawei

Hi B O E,

Yes, I patched the extract.rul file with those two lines.

My extraction tool is cadence Extraction QRC - 64-bit Parasitic Extractor - Version 12.1.0-s488. But I think that rule is valid for Assura 4.1, too.

Best Regards,
Yawei