From 541b744e829e7516fe2984d9472eed88083a07a1 Mon Sep 17 00:00:00 2001
From: Jesse Cirimelli-Low <jcirimel@ucsc.edu>
Date: Thu, 14 May 2026 16:21:29 -0700
Subject: [PATCH] create separate nand cells for user drc sky130 cell

---
 .../sky130/gds_lib/sky130_custom_nand2_dec.gds  | Bin 0 -> 4020 bytes
 .../sky130/gds_lib/sky130_custom_nand3_dec.gds  | Bin 0 -> 6274 bytes
 .../sky130/gds_lib/sky130_custom_nand4_dec.gds  | Bin 0 -> 10704 bytes
 .../sky130/sp_lib/sky130_custom_nand2_dec.sp    |   8 ++++++++
 .../sky130/sp_lib/sky130_custom_nand3_dec.sp    |  11 +++++++++++
 .../sky130/sp_lib/sky130_custom_nand4_dec.sp    |  12 ++++++++++++
 .../tech/tech_configs/tech_custom_cell.py       |   6 +++---
 7 files changed, 34 insertions(+), 3 deletions(-)
 create mode 100644 technology/sky130/gds_lib/sky130_custom_nand2_dec.gds
 create mode 100644 technology/sky130/gds_lib/sky130_custom_nand3_dec.gds
 create mode 100644 technology/sky130/gds_lib/sky130_custom_nand4_dec.gds
 create mode 100644 technology/sky130/sp_lib/sky130_custom_nand2_dec.sp
 create mode 100644 technology/sky130/sp_lib/sky130_custom_nand3_dec.sp
 create mode 100644 technology/sky130/sp_lib/sky130_custom_nand4_dec.sp

diff --git a/technology/sky130/gds_lib/sky130_custom_nand2_dec.gds b/technology/sky130/gds_lib/sky130_custom_nand2_dec.gds
new file mode 100644
index 0000000000000000000000000000000000000000..6d37eb17075cea310e6e7ae88e8f267fbdc8946c
GIT binary patch
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diff --git a/technology/sky130/gds_lib/sky130_custom_nand3_dec.gds b/technology/sky130/gds_lib/sky130_custom_nand3_dec.gds
new file mode 100644
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GIT binary patch
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diff --git a/technology/sky130/gds_lib/sky130_custom_nand4_dec.gds b/technology/sky130/gds_lib/sky130_custom_nand4_dec.gds
new file mode 100644
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diff --git a/technology/sky130/sp_lib/sky130_custom_nand2_dec.sp b/technology/sky130/sp_lib/sky130_custom_nand2_dec.sp
new file mode 100644
index 00000000..77d1cffe
--- /dev/null
+++ b/technology/sky130/sp_lib/sky130_custom_nand2_dec.sp
@@ -0,0 +1,8 @@
+* NGSPICE file created from sky130_fd_bd_sram__openram_sp_custom_nand2_dec.ext - technology: sky130A
+
+.subckt sky130_custom_nand2_dec A B Z VDD GND
+X0 Z A VDD VDD sky130_fd_pr__pfet_01v8 w=1.12 l=0.15
+X1 VDD B Z VDD sky130_fd_pr__pfet_01v8 w=1.12 l=0.15
+X2 a_196_224# B GND GND sky130_fd_pr__nfet_01v8 w=0.74 l=0.15
+X3 Z A a_196_224# GND sky130_fd_pr__nfet_01v8 w=0.74 l=0.15
+.ends
diff --git a/technology/sky130/sp_lib/sky130_custom_nand3_dec.sp b/technology/sky130/sp_lib/sky130_custom_nand3_dec.sp
new file mode 100644
index 00000000..5ab03866
--- /dev/null
+++ b/technology/sky130/sp_lib/sky130_custom_nand3_dec.sp
@@ -0,0 +1,11 @@
+* Top level circuit sky130_fd_bd_sram__openram_sp_custom_nand3_dec
+.subckt sky130_custom_nand3_dec A B C Z VDD GND
+
+X1001 Z A a_n346_328# GND sky130_fd_pr__nfet_01v8 W=0.74u L=0.15u m=1
+X1002 a_n346_256# C GND GND sky130_fd_pr__nfet_01v8 W=0.74u L=0.15u m=1
+X1003 a_n346_328# B a_n346_256# GND sky130_fd_pr__nfet_01v8 W=0.74u L=0.15u m=1
+X1000 Z B VDD VDD sky130_fd_pr__pfet_01v8 W=1.12u L=0.15u m=1
+X1004 Z A VDD VDD sky130_fd_pr__pfet_01v8 W=1.12u L=0.15u m=1
+X1005 Z C VDD VDD sky130_fd_pr__pfet_01v8 W=1.12u L=0.15u m=1
+.ends
+
diff --git a/technology/sky130/sp_lib/sky130_custom_nand4_dec.sp b/technology/sky130/sp_lib/sky130_custom_nand4_dec.sp
new file mode 100644
index 00000000..4fbfb229
--- /dev/null
+++ b/technology/sky130/sp_lib/sky130_custom_nand4_dec.sp
@@ -0,0 +1,12 @@
+* NGSPICE file created from sky130_fd_bd_sram__openram_sp_custom_nand4_dec.ext - technology: sky130A
+
+.subckt sky130_custom_nand4_dec A B C D Z VDD GND
+X0 VDD C Z VDD sky130_fd_pr__pfet_01v8 w=1.12u l=0.15u
+X1 a_n384_98# C a_128_208# GND sky130_fd_pr__nfet_01v8 w=0.74u l=0.15u
+X2 Z D VDD VDD sky130_fd_pr__pfet_01v8 w=1.12u l=0.15u
+X3 Z B VDD VDD sky130_fd_pr__pfet_01v8 w=1.12u l=0.15u
+X4 a_128_136# A Z GND sky130_fd_pr__nfet_01v8 w=0.74u l=0.15u
+X5 VDD A Z VDD sky130_fd_pr__pfet_01v8 w=1.12u l=0.15u
+X6 a_128_208# B a_128_136# GND sky130_fd_pr__nfet_01v8 w=0.74u l=0.15u
+X7 GND D a_n384_98# GND sky130_fd_pr__nfet_01v8 w=0.74u l=0.15u
+.ends
diff --git a/technology/sky130/tech/tech_configs/tech_custom_cell.py b/technology/sky130/tech/tech_configs/tech_custom_cell.py
index 0ce078d5..357f4e7d 100644
--- a/technology/sky130/tech/tech_configs/tech_custom_cell.py
+++ b/technology/sky130/tech/tech_configs/tech_custom_cell.py
@@ -226,9 +226,9 @@ cell_properties.write_driver.port_map = {'din': 'DIN',
 # If it is a list, the first is single port and the second is dual port.
 # If it is string, it is used for both single and dual port.
 cell_properties.names["dff"] = "sky130_fd_bd_sram__openram_dff"
-cell_properties.names["nand2_dec"] = ["sky130_fd_bd_sram__openram_dp_nand2_dec", "sky130_fd_bd_sram__openram_dp_nand2_dec"]
-cell_properties.names["nand3_dec"] = ["sky130_fd_bd_sram__openram_dp_nand3_dec", "sky130_fd_bd_sram__openram_dp_nand3_dec"]
-cell_properties.names["nand4_dec"] = ["sky130_fd_bd_sram__openram_dp_nand4_dec", "sky130_fd_bd_sram__openram_dp_nand4_dec"]
+cell_properties.names["nand2_dec"] = ["sky130_custom_nand2_dec", "sky130_fd_bd_sram__openram_dp_nand2_dec"]
+cell_properties.names["nand3_dec"] = ["sky130_custom_nand3_dec", "sky130_fd_bd_sram__openram_dp_nand3_dec"]
+cell_properties.names["nand4_dec"] = ["sky130_custom_nand4_dec", "sky130_fd_bd_sram__openram_dp_nand4_dec"]
 
 cell_properties.names["bitcell_1port"] = "sky130_custom_cell"
 cell_properties.names["replica_bitcell_1port"] = "sky130_custom_replica"