From 20683e70e41f574b52b90334401ed499c40b11db Mon Sep 17 00:00:00 2001
From: "Emil J. Tywoniak" <emil@tywoniak.eu>
Date: Thu, 17 Oct 2024 16:50:59 +0200
Subject: [PATCH] synth: clockgate command demo for sky130hd

Signed-off-by: Emil J. Tywoniak <emil@tywoniak.eu>
---
 flow/platforms/sky130hd/config.mk | 3 +++
 flow/scripts/synth.tcl            | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/flow/platforms/sky130hd/config.mk b/flow/platforms/sky130hd/config.mk
index 165cf2f3dc..ac2b5b0721 100644
--- a/flow/platforms/sky130hd/config.mk
+++ b/flow/platforms/sky130hd/config.mk
@@ -77,6 +77,9 @@ export ADDER_MAP_FILE ?= $(PLATFORM_DIR)/cells_adders_hd.v
 # Define ABC driver and load
 export ABC_DRIVER_CELL = sky130_fd_sc_hd__buf_1
 export ABC_LOAD_IN_FF = 5
+
+export CLOCKGATE_CMD = clockgate -pos sky130_fd_sc_hd__dlclkp_4 GATE:CLK:GCLK -min_net_size 8
+
 #--------------------------------------------------------
 # Floorplan
 # -------------------------------------------------------
diff --git a/flow/scripts/synth.tcl b/flow/scripts/synth.tcl
index ec1c3445c8..46857b3bd2 100644
--- a/flow/scripts/synth.tcl
+++ b/flow/scripts/synth.tcl
@@ -40,6 +40,8 @@ foreach cell $::env(DONT_USE_CELLS) {
   lappend dfflibmap_args -dont_use $cell
 }
 
+yosys $::env(CLOCKGATE_CMD)
+
 # Technology mapping of flip-flops
 # dfflibmap only supports one liberty file
 if {[env_var_exists_and_non_empty DFF_LIB_FILE]} {