Added a patch file to correct the deep nwell and nwell overlap
errors in the original SkyWater layout for the GPIOv2 cell in
the sky130_fd_io library.
diff --git a/VERSION b/VERSION
index 5c037ec..d1deb38 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.293
+1.0.294
diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index 3a49b01..9373208 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -524,6 +524,7 @@
# These definitions depend on the setting of EF_STYLE
ifeq (${EF_STYLE}, 1)
IO_VERILOG = verilog/sky130_fd_io
+ IO_GDS = gds/sky130_fd_io
HD_VERILOG = verilog/sky130_fd_sc_hd
HDLL_VERILOG = verilog/sky130_fd_sc_hdll
HVL_VERILOG = verilog/sky130_fd_sc_hvl
@@ -542,6 +543,7 @@
SPIEXT = spi
else
IO_VERILOG = sky130_fd_io/verilog
+ IO_GDS = sky130_fd_io/gds
HD_VERILOG = sky130_fd_sc_hd/verilog
HDLL_VERILOG = sky130_fd_sc_hdll/verilog
HVL_VERILOG = sky130_fd_sc_hvl/verilog
@@ -1181,6 +1183,11 @@
compile-only rename=sky130_ef_io \
-lef %l/lef/sky130_fd_io__top_xres4v2.lef \
-library general sky130_fd_io 2>&1 | tee -a ${SKY130$*}_make.log
+ # Copy the GDS file for the GPIOv2 cell, then run the script that fixes it.
+ cp ${SKYWATER_LIBS_PATH}/sky130_fd_io/latest/cells/top_gpiov2/sky130_fd_io__top_gpiov2.gds \
+ ${STAGING_PATH}/${SKY130$*}/libs.ref/${IO_GDS}
+ ./custom/scripts/fix_gpiov2_gds.py \
+ ${STAGING_PATH}/${SKY130$*}/libs.ref/${IO_GDS}/sky130_fd_io__top_gpiov2.gds
# Install SkyWater I/O pad library
${STAGE} -source ${SKYWATER_LIBS_PATH} -target ${STAGING_PATH}/${SKY130$*} \
-cdl %l/latest/cells/*/*.cdl ignore=topography compile-only \
@@ -1196,6 +1203,8 @@
-gds %l/latest/cells/*/*.gds compile-only \
sort=../common/sort_pdkfiles.py \
options=custom/scripts/sky130_fd_io_import.tcl \
+ no-copy=sky130_fd_io__top_gpiov2.gds \
+ include=sky130_fd_io__top_gpiov2.gds \
-verilog %l/latest/cells/*/*.*.v \
-verilog %l/latest/cells/*/*.v exclude=*.*.v,sky130_ef_io.v \
compile-only filter=custom/scripts/inc_verilog.py \
diff --git a/sky130/custom/scripts/fix_gpiov2_gds.py b/sky130/custom/scripts/fix_gpiov2_gds.py
new file mode 100755
index 0000000..3c8c788
--- /dev/null
+++ b/sky130/custom/scripts/fix_gpiov2_gds.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+#
+# fix_gpiov2_gds.py ---
+#
+# Special-purpose script that does the work of what ought to be a simple
+# binary diff and patch. Except that no such thing exists as a standard
+# offering on most Linux systems, so instead of adding another OS
+# package requirement, I'm just writing a binary search-and-replace in
+# python.
+#
+# The purpose of the patch is to correct the coordinates of the deep nwell
+# and nwell layers in the cell amux_switch_1v2b, as the SkyWater cell
+# contains DRC errors.
+#
+# Specifically, DNWELL coordinate (34.450, 0.035) is moved to (34.905, 0.035)
+# and NWELL coordinate (35.055, -0.365) is moved to (35.390, -0.365)
+
+import sys
+
+if len(sys.argv) != 2:
+ print('Usage: fix_gpiov2_gds.py <filename>')
+ sys.exit(1)
+else:
+ file_name = sys.argv[1]
+
+orig_data_1 = b'\x00\x00\x86\x92\x00\x00\x00\x23\x00\x00\x86\x92'
+replace_data_1 = b'\x00\x00\x88\x59\x00\x00\x00\x23\x00\x00\x88\x59'
+
+orig_data_2 = b'\x00\x00\x88\xef\xff\xff\xff\x8d\x00\x00\x47\xef\xff\xff\xff\x8d'
+replace_data_2 = b'\x00\x00\x8a\x3e\x00\x00\x00\x91\x00\x00\x47\xef\x00\x00\x00\x91'
+
+orig_data_3 = b'\x00\x00\x88\xef\xff\xff\xfe\x93\x00\x00\x88\xef\xff\xff\xff\x8d'
+replace_data_3 = b'\x00\x00\x8a\x3e\xff\xff\xfe\x93\x00\x00\x8a\x3e\x00\x00\x00\x91'
+
+# This is not efficient, but only needs to be done once.
+
+with open(file_name, 'rb') as ifile:
+ data = ifile.read()
+ data = data.replace(orig_data_1, replace_data_1)
+ data = data.replace(orig_data_2, replace_data_2)
+ data = data.replace(orig_data_3, replace_data_3)
+
+# Write back into the same file
+with open(file_name, 'wb') as ofile:
+ ofile.write(data)
+
+print("Done!")
diff --git a/sky130/custom/sky130_fd_io/README b/sky130/custom/sky130_fd_io/README
index 52b7385..03c4bdd 100644
--- a/sky130/custom/sky130_fd_io/README
+++ b/sky130/custom/sky130_fd_io/README
@@ -16,5 +16,7 @@
either high- or low-voltage clamps, connecting to one of the six
power domains vddio, vdda, vccd, vssio, vssa, or vssd.
+(4) Fix a DRC error in the SkyWater GPIO pad layout
+
"sky130_ef_io" is open source copyright 2020 efabless, Inc.
Released under Apache 2.0 license
