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Post-Layout Simulation
DSPF File Structure
DSPF File Structure
Input for: .DSPF_INCLUDE command.
The DSPF file contains parasitic information extracted from layout.
Format
The file begins with a header including release number and tool used for extraction. It also
includes the hierarchical divider and the delimiter used in subnode names.
*|DSPF 1.0
*|DIVIDER /
*|DELIMITER :
The following section, net parasitics, contains the net names and their total net capacitance:
*|NET N1 5.324e-12
The following section contains port names, instances and nodes:
*|P (N1 X 0.0) --> A port in the net for external connection
*|I (M2:g M2 G I 0.0) --> Instance pin in the net for internal connection
*|S (N1:1) --> A subnode in the net
The native SPICE parasitic network follows (instance section), including the transistors:
Cin/01 N1 Vss 1.3pF
Rin/01 N1 N1:1 5
Rin/12 N1:10 M1:g 0.1k
M1 M1:d M1:g M1:s M1:b nmos w=2e-6 l=1e-6 ad=1.04e-12 as=6.2e-13
Note
Make sure all parasitics in the DSPF file are placed before the Instance Section. Differences
in DSPF files come from the different extraction tools.
Parameters
None.
Related Topics
Parasitic Network Types
Eldo Post-Layout Commands
Eldo Post-Layout Options
DSPF Backannotation Examples
SPEF File Structure
Eldo® User's Manual, 15.3 393