LVS/CVC issues with caravel modules

[d-m-bailey]

This issue is an on going list of the device level LVS and CVC issues with caravel modules. origin/develop commit 384a7d517a82c49a0c4411c8132ce3f97eebfad5 magic 8.3.133 The indentation of the list is intended to show the hierachy. Unless otherwise indicated, CVC was run on the netlist extracted from GDS.

Cell	LVS	CVC
caravel
+ chip_io
+ gpio_control_block	OK? (vssd matched to vssd1)	OK
+ mgmt_core	OK	OK
| + DFFRAM	OK	OK
| - digital_pll	OK	OK
+ mgmt_protect	-	OK
| + mgmt_protect_hv	NG (verilog missing decap)	-
| + mprj2_logic_high	OK	-
| - mprj_logic_high	OK	-
+ simple_por	NG (verilog and gds contain different cells)
+ sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped	NG (library spice incorrect)	OK
+ storage	NG (bus index mapping incorrect)	NG (Hi-Z inputs)
| - sram_1rw1r_32_256_8_sky130	-	-
+ user_id_programming	OK	OK
+ user_project_wrapper	OK	OK
| - user_proj_example	OK	-

[ax3ghazy]

@d-m-bailey: Thanks!

I have renamed the old device names to the new sky130 equivalents in the SRAM spice netlist we got from OpenRAM. Please check if this helps: https://github.com/efabless/sky130_sram_macros/blob/sky130_name_mapping/sram_1rw1r_32_256_8_sky130/sram_1rw1r_32_256_8_sky130.lvs.converted.sp

[d-m-bailey]

For running device level LVS and CVC on other projects on the MPW (assuming user_project_wrapper is the only difference).

1. cd project
2. Uncompress gds/user_project_wrapper.gds
3. Recursively check for referenced modules in verilog/gl/user_project_wrapper.v awk '/ \(/ {print $1}' verilog/gl/user_project_wrapper.v | sort -u | grep -v sky130_fd_sc_hd__
4. For each submodule detected in 2, add an entry in openlane/user_project_wrapper/config.tcl

   set ::env(LVS_EXTRA_GATE_LEVEL_VERILOG) "
   $script_dir/../../verilog/gl/submodule1.v
   $script_dir/../../verilog/gl/submodule2.v
   ..."

5. From docker, in project/openlane extract device level spice from layout.

   flow.tcl -design user_project_wrapper -tag lvs -lvs -net ../verilog/gl/user_project_wrapper.v -gds ../gds/user_project_wrapper.gds

6. Create spi2cdl script

   
   cat > spi2cdl <<'!'
   # /bin/bash

mkdir -p $1/runs/lvs/results/cvc

awk ' /^X. .pr[^ ]fet.=/ { print "M" $0; next;
} /^X.*prdiode/ { print "D" $0; next;
} /^X.pr__cap_mimm3. / { print "C" $0; next;
} /^X.prres_xhigh_po / { $4 = ""; print "R" $0; next;
} /^X.*prresgeneric.d/ { $6 = sprintf("$SUB=%s %s", $4, $6); $4 = ""; print "R" $0; next;
} { print $0; } ' $1/runs/lvs/results/magic/$1.gds.spice > $1/runs/lvs/results/cvc/$1.cdl !