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Added libppa.pl to characterize liberty files
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David Harris
parent
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246
bin/libppa.pl
Executable file
246
bin/libppa.pl
Executable file
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#!/bin/perl -W
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###########################################
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## libppa.pl
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##
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## Written: David_Harris@hmc.edu
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## Created: 28 January 2023
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##
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## Purpose: Extract PPA information from Liberty files
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## presently characterizes Skywater 90 and TSMC28hpc+
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##
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## The user will need to change $libpath to point to the desired library in your local installation
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## and for TSMC change the $cellname to the actual name of the inverter.
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##
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## A component of the CORE-V-WALLY configurable RISC-V project.
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##
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## Copyright (C) 2021-23 Harvey Mudd College & Oklahoma State University
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##
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## SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
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##
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## Licensed under the Solderpad Hardware License v 2.1 (the “License”); you may not use this file
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## except in compliance with the License, or, at your option, the Apache License version 2.0. You
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## may obtain a copy of the License at
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##
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## https:##solderpad.org/licenses/SHL-2.1/
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##
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## Unless required by applicable law or agreed to in writing, any work distributed under the
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## License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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## either express or implied. See the License for the specific language governing permissions
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## and limitations under the License.
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################################################################################################
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use strict;
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use warnings;
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# global variables for simplicity
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my @index1; my @index2;
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my @values;
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my @cr; my @cf; my @rt; my @ft;
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# cell and corners to analyze
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my $libpath; my $libbase; my $cellname; my @corners;
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# Sky90
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$libpath ="/opt/riscv/cad/lib/sky90/sky90_sc/V1.7.4/lib";
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$libbase = "scc9gena_";
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$cellname = "scc9gena_inv_1";
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@corners = ("tt_1.2v_25C", "tt_1.08v_25C", "tt_1.32v_25C", "tt_1.2v_-40C", "tt_1.2v_85C", "tt_1.2v_125C", "ss_1.2v_25C", "ss_1.08v_-40C", "ss_1.08v_25C", "ss_1.08v_125C", "ff_1.2v_25C", "ff_1.32v_-40C", "ff_1.32v_25C", "ff_1.32v_125C");
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printf("Library $libbase Cell $cellname\n");
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foreach my $corner (@corners) {
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&analyzeCell($corner);
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}
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# TSMC
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$libpath = "/proj/models/tsmc28/libraries/28nmtsmc/tcbn28hpcplusbwp30p140_190a/TSMCHOME/digital/Front_End/timing_power_noise/NLDM/tcbn28hpcplusbwp30p140_180a";
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$libbase = "tcbn28hpcplusbwp30p140";
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$cellname = "INVD1..."; // replace this with the full name of the library cell
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@corners = ("tt0p9v25c", "tt0p8v25c", "tt1v25c", "tt0p9v85c", "ssg0p9vm40c", "ssg0p9v125c", "ssg0p81vm40c", "ssg0p81v125c", "ffg0p88vm40c", "ffg0p88v125c", "ffg0p99vm40c", "ffg0p99v125c");
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printf("\nLibrary $libbase Cell $cellname\n");
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foreach my $corner (@corners) {
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&analyzeCell($corner);
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}
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#############
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# subroutines
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#############
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sub analyzeCell {
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my $corner = shift;
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my $fname = $libpath."/".$libbase.$corner.".lib";
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open (FILE, $fname) || die("Can't read $fname");
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my $incell = 0;
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my $inleakage = 0;
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my $inpin = 0;
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my $incellrise = 0;
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my $incellfall = 0;
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my $inrisetrans = 0;
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my $infalltrans = 0;
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my $inindex = 0;
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my $invalues = 0;
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my $searchstring = "cell (".$cellname.")";
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my $area; my $leakage; my $cap;
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while (<FILE>) {
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if (index($_, $searchstring) != -1) { $incell = 1;}
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elsif ($incell) {
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if (/cell \(/) {
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$incell = 0;
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close(FILE);
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last;
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}
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if (/area\s*:\s*(.*);/) { $area = $1; }
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if (/cell_leakage_power\s*:\s*(.*);/) { $leakage = $1; $inleakage = 2; }
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if ($inleakage == 0 && /leakage_power/) { $inleakage = 1; }
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if ($inleakage == 1 && /value\s*:\s*(.*);/) {
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$leakage = $1;
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$inleakage = 2;
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}
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if ($inpin == 0 && /pin/) { $inpin = 1; }
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if ($inpin == 1 && /\s+capacitance\s*:\s*(.*);/) {
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$cap = $1;
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$inpin = 2;
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}
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if ($inindex == 0 && /index_1/) { $inindex = 1; }
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if ($inindex == 1) {
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if (/index_1\s*\(\"(.*)\"\);/) { @index1 = split(/, /, $1); }
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if (/index_2\s*\(\"(.*)\"\);/) { @index2 = split(/, /, $1); $inindex = 2; }
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}
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if ($incellrise == 0 && /cell_rise/) { $incellrise = 1; $invalues = 0;}
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if ($incellfall == 0 && /cell_fall/) { $incellfall = 1; $invalues = 0; }
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if ($inrisetrans == 0 && /rise_trans/) { $inrisetrans = 1; $invalues = 0; }
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if ($infalltrans == 0 && /fall_trans/) { $infalltrans = 1; $invalues = 0; }
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if ($incellrise == 1 || $incellfall == 1 || $inrisetrans == 1 || $infalltrans == 1) {
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if (/values/) { $invalues = 1; @values = (); }
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elsif ($invalues == 1) {
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if (/\);/) {
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$invalues = 2;
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if ($incellrise == 1) { @cr = &parseVals(); $incellrise = 2; }
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if ($incellfall == 1) { @cf = &parseVals(); $incellfall = 2; }
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if ($inrisetrans == 1) { @rt = &parseVals(); $inrisetrans = 2; }
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if ($infalltrans == 1) { @ft = &parseVals(); $infalltrans = 2; }
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}
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elsif (/\"(.*)\"/) { push(@values, $1); }
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}
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}
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# print $_;
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}
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}
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my $delay = &computeDelay($cap);
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my $cornerr = sprintf("%20s", $corner);
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my $delayr = sprintf("%2.1f", $delay*1000);
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my $leakager = sprintf("%3.1f", $leakage);
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print("$cornerr: Delay $delayr Leakage: $leakager capacitance: $cap\n");
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#print("$cellname $corner: Area $area Leakage: $leakage capacitance: $cap delay $delay\n");
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#print(" index1: @index1\n");
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#print(" index2: @index2\n");
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#print("Cell Rise\n"); printMatrix(\@cr);
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#print("Cell Fall\n"); printMatrix(\@cf);
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#print("Rise Trans\n"); printMatrix(\@rt);
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#print("Fall Trans\n"); printMatrix(\@ft);
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}
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sub computeDelay {
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# relies on cr, cf, rt, ft, index1, index2
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# index1 for rows of matrix (different trans times, units of ns)
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# index2 for cols of matrix (different load capacitances, units of pF)
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# first, given true load, create a rise/fall delay and transition
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# as a function of trans time, interpolated
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my $cap = shift;
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my $fo4cap = 4*$cap;
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my @cri = &interp2(\@cr, $fo4cap);
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my @cfi = &interp2(\@cf, $fo4cap);
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my @rti = &interp2(\@rt, $fo4cap);
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my @fti = &interp2(\@ft, $fo4cap);
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# initially guess second smallest transition time
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my $tt = $index1[1];
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# assume falling input with this transition, compute rise delay & trans
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my $cr0 = &interp1(\@cri, \@index1, $tt);
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my $rt0 = &interp1(\@rti, \@index1, $tt);
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# now assuming rising input with rt0, compute fall delay & trans
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my $cf1 = &interp1(\@cfi, \@index1, $rt0);
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my $ft1 = &interp1(\@fti, \@index1, $rt0);
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# now assuming falling input with ft1, compute rise delay & trans
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my $cr2 = &interp1(\@cri, \@index1, $ft1);
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my $rt2 = &interp1(\@rti, \@index1, $ft1);
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# now assuming rising input with rt2, compute fall delay & trans
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my $cf3 = &interp1(\@cfi, \@index1, $rt2);
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my $ft3 = &interp1(\@fti, \@index1, $rt2);
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# delay is average of rising and falling
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my $delay = ($cr2 + $cf3)/2;
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return $delay;
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# print("tt $tt cr0 $cr0 rt0 $rt0\n");
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# print("cf1 $cf1 ft1 $ft1 cr2 $cr2 rt2 $rt2 cf3 $cf3 ft3 $ft3 delay $delay\n");
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}
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sub interp2 {
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my $matref = shift;
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my @matrix = @$matref;
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my $fo4cap = shift;
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my @interp = ();
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my $i;
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# interpolate row by row
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for ($i=0; $i <= $#index1; $i++) {
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my @row = @{$matrix[$i]};
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#print ("Extracted row $i = @row\n");
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$interp[$i] = &interp1(\@row, \@index2, $fo4cap);
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}
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return @interp;
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}
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sub interp1 {
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my $vecref = shift;
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my @vec = @$vecref;
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my $indexref = shift;
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my @index = @$indexref;
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my $x = shift;
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# find entry i containing the first index greater than x
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my $i = 0;
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while ($index[$i] < $x) {$i++}
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my $start = $index[$i-1];
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my $end = $index[$i];
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my $fract = ($x-$start)/($end-$start);
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my $interp = $vec[$i-1] + ($vec[$i] - $vec[$i-1])*$fract;
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# print ("Interpolating $x as $interp from i $i start $start end $end based on index @index and vec @vec\n");
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return $interp;
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}
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sub parseVals {
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# relies on global variables @values, @index1, @index2
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my @vals;
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my $i; my $j;
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for ($i=0; $i <= $#index1; $i++) {
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my @row = split(/, /,$values[$i]);
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for ($j = 0; $j <= $#index2; $j++) {
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$vals[$i][$j] = $row[$j];
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}
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}
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return @vals;
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}
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sub printMatrix {
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my $mat = shift;
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my @matrix = @$mat;
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my $i; my $j;
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for ($i=0; $i <= $#index1; $i++) {
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for ($j = 0; $j <= $#index2; $j++) {
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print($matrix[$i][$j]." ");
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}
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print("\n");
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}
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}
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