diff --git a/docs/user/FlowVariables.md b/docs/user/FlowVariables.md
index 5d84f396df..3d2f7e0252 100644
--- a/docs/user/FlowVariables.md
+++ b/docs/user/FlowVariables.md
@@ -116,7 +116,6 @@ configuration file.
| MACRO_HALO_Y| Set macro halo for y-direction. Only available for ASAP7 PDK.| | |
| MACRO_PLACEMENT| Specifies the path of a file on how to place certain macros manually using read_macro_placement.| | |
| MACRO_PLACEMENT_TCL| Specifies the path of a TCL file on how to place certain macros manually.| | |
-| MACRO_PLACE_CHANNEL| Horizontal/vertical channel width between macros (microns). Used by automatic macro placement. Imagine channel=10 and halo=5. Then macros must be 10 apart but standard cells must be 5 away from a macro.| | |
| MACRO_PLACE_HALO| Horizontal/vertical halo around macros (microns). Used by automatic macro placement.| | |
| MACRO_WRAPPERS| The wrapper file that replaces existing macros with their wrapped version.| | |
| MAKE_TRACKS| Tcl file that defines add routing tracks to a floorplan.| | |
@@ -230,7 +229,6 @@ configuration file.
- [MACRO_HALO_Y](#MACRO_HALO_Y)
- [MACRO_PLACEMENT](#MACRO_PLACEMENT)
- [MACRO_PLACEMENT_TCL](#MACRO_PLACEMENT_TCL)
-- [MACRO_PLACE_CHANNEL](#MACRO_PLACE_CHANNEL)
- [MACRO_PLACE_HALO](#MACRO_PLACE_HALO)
- [MACRO_WRAPPERS](#MACRO_WRAPPERS)
- [MAKE_TRACKS](#MAKE_TRACKS)
diff --git a/flow/designs/asap7/riscv32i/config.mk b/flow/designs/asap7/riscv32i/config.mk
index 902d851f21..9f6644686a 100644
--- a/flow/designs/asap7/riscv32i/config.mk
+++ b/flow/designs/asap7/riscv32i/config.mk
@@ -25,7 +25,6 @@ export CORE_AREA = 5 5 75 85
export PLACE_DENSITY_LB_ADDON = 0.10
export PLACE_PINS_ARGS = -exclude left:* -exclude right:* -exclude top:*
-export MACRO_PLACE_HALO = 1 1
-export MACRO_PLACE_CHANNEL = 6 6
-#
+export MACRO_PLACE_HALO = 2 2
+
export TNS_END_PERCENT = 100
diff --git a/flow/designs/gf12/ariane/config.mk b/flow/designs/gf12/ariane/config.mk
index bc3ef63e47..9480409d03 100644
--- a/flow/designs/gf12/ariane/config.mk
+++ b/flow/designs/gf12/ariane/config.mk
@@ -25,8 +25,6 @@ export PLACE_DENSITY ?= 0.50
export PLACE_PINS_ARGS = -exclude left:0-150 -exclude left:450-600 -exclude right:* -exclude top:* -exclude bottom:*
export MACRO_PLACE_HALO = 7 7
-export MACRO_PLACE_CHANNEL = 14 14
-
export MACRO_WRAPPERS = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/wrappers.tcl
ifeq ($(USE_FILL),1)
diff --git a/flow/designs/gf12/ariane133/config.mk b/flow/designs/gf12/ariane133/config.mk
index fb084b725a..b7f214aaa8 100644
--- a/flow/designs/gf12/ariane133/config.mk
+++ b/flow/designs/gf12/ariane133/config.mk
@@ -4,8 +4,6 @@ export PLATFORM = gf12
export SYNTH_HIERARCHICAL = 1
export MAX_UNGROUP_SIZE ?= 10000
-#
-# RTL_MP Settings
export VERILOG_FILES = $(PLATFORM_DIR)/ariane133/ariane.v
@@ -22,7 +20,6 @@ export CORE_AREA = 5 5 895 745
export PLACE_PINS_ARGS = -exclude left:0-200 -exclude left:500-700 -exclude right:* -exclude top:* -exclude bottom:*
export MACRO_PLACE_HALO = 7 7
-export MACRO_PLACE_CHANNEL = 14 14
export PLACE_DENSITY_LB_ADDON = 0.05
diff --git a/flow/designs/gf12/bp_dual/config.mk b/flow/designs/gf12/bp_dual/config.mk
index 4d6b9b04bf..159f053a88 100644
--- a/flow/designs/gf12/bp_dual/config.mk
+++ b/flow/designs/gf12/bp_dual/config.mk
@@ -65,6 +65,4 @@ export MACRO_WRAPPERS = $(PLATFORM_DIR)/bp/wrappers/wrappers.tcl
export PDN_TCL = $(PLATFORM_DIR)/cfg/pdn_grid_strategy_13m_9T.top.tcl
-# Define macro halo and channel spacings
-export MACRO_PLACE_HALO = 7 7
-export MACRO_PLACE_CHANNEL = 14 14
+export MACRO_PLACE_HALO = 7 7
\ No newline at end of file
diff --git a/flow/designs/gf12/bp_quad/config.mk b/flow/designs/gf12/bp_quad/config.mk
index 9f756213fc..44489ccd10 100644
--- a/flow/designs/gf12/bp_quad/config.mk
+++ b/flow/designs/gf12/bp_quad/config.mk
@@ -47,6 +47,4 @@ export MACRO_WRAPPERS = $(PLATFORM_DIR)/bp/wrappers/wrappers.tcl
export PDN_TCL = $(PLATFORM_DIR)/cfg/pdn_grid_strategy_13m_9T.top.tcl
-# Define macro halo and channel spacings
export MACRO_PLACE_HALO = 5 5
-export MACRO_PLACE_CHANNEL = 10 10
diff --git a/flow/designs/gf12/ca53/config.mk b/flow/designs/gf12/ca53/config.mk
index 01798462da..eb0a474a98 100644
--- a/flow/designs/gf12/ca53/config.mk
+++ b/flow/designs/gf12/ca53/config.mk
@@ -51,7 +51,6 @@ export PLACE_DENSITY_LB_ADDON = 0.05
export PLACE_PINS_ARGS = -exclude left:0-600 -exclude left:1350-1400 -exclude right:* -exclude top:* -exclude bottom:*
export MACRO_PLACE_HALO = 7 7
-export MACRO_PLACE_CHANNEL = 14 14
export MACRO_WRAPPERS = $(dir $(DESIGN_CONFIG))/wrappers.tcl
diff --git a/flow/designs/gf12/swerv_wrapper/config.mk b/flow/designs/gf12/swerv_wrapper/config.mk
index 56b208a44d..f9485963fb 100644
--- a/flow/designs/gf12/swerv_wrapper/config.mk
+++ b/flow/designs/gf12/swerv_wrapper/config.mk
@@ -35,7 +35,6 @@ export PLACE_DENSITY_LB_ADDON = 0.05
export MACRO_WRAPPERS = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/wrappers.tcl
#
export MACRO_PLACE_HALO = 7 7
-export MACRO_PLACE_CHANNEL = 14 14
ifeq ($(USE_FILL),1)
export DESIGN_TYPE = CELL
diff --git a/flow/designs/gf180/uart-blocks/config.mk b/flow/designs/gf180/uart-blocks/config.mk
index 70ba7881f3..7f7a87483b 100644
--- a/flow/designs/gf180/uart-blocks/config.mk
+++ b/flow/designs/gf180/uart-blocks/config.mk
@@ -15,7 +15,6 @@ export CORE_AREA = 10 10 420 420
export PLACE_PINS_ARGS = -exclude bottom:* -exclude top:* -exclude right:*
export MACRO_PLACE_HALO = 20 20
-export MACRO_PLACE_CHANNEL = 20 20
export PDN_TCL = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/BLOCKS_grid_strategy.tcl
export PLACE_DENSITY = 0.60
diff --git a/flow/designs/nangate45/ariane133/config.mk b/flow/designs/nangate45/ariane133/config.mk
index 6790881b88..c34461aa77 100644
--- a/flow/designs/nangate45/ariane133/config.mk
+++ b/flow/designs/nangate45/ariane133/config.mk
@@ -24,6 +24,6 @@ export CORE_AREA = 10 12 1448 1448
export PLACE_PINS_ARGS = -exclude left:0-500 -exclude left:1000-1500: -exclude right:* -exclude top:* -exclude bottom:*
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
+
export TNS_END_PERCENT = 100
export SKIP_GATE_CLONING = 1
diff --git a/flow/designs/nangate45/ariane136/config.mk b/flow/designs/nangate45/ariane136/config.mk
index 2a72f8effb..7f2adefa74 100644
--- a/flow/designs/nangate45/ariane136/config.mk
+++ b/flow/designs/nangate45/ariane136/config.mk
@@ -26,6 +26,6 @@ export CORE_AREA = 10 12 1448 1448
export PLACE_PINS_ARGS = -exclude left:0-500 -exclude left:1000-1500: -exclude right:* -exclude top:* -exclude bottom:*
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
+
export TNS_END_PERCENT = 100
export PLACE_DENSITY = 0.35
diff --git a/flow/designs/nangate45/black_parrot/config.mk b/flow/designs/nangate45/black_parrot/config.mk
index 16e60bd058..52251a4d4d 100644
--- a/flow/designs/nangate45/black_parrot/config.mk
+++ b/flow/designs/nangate45/black_parrot/config.mk
@@ -37,5 +37,5 @@ export PLACE_PINS_ARGS = -exclude left:* -exclude right:* -exclude top:* -exclud
export PLACE_DENSITY_LB_ADDON = 0.05
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
+
export TNS_END_PERCENT = 100
diff --git a/flow/designs/nangate45/bp_be_top/config.mk b/flow/designs/nangate45/bp_be_top/config.mk
index 6d21176d60..7b810d7971 100644
--- a/flow/designs/nangate45/bp_be_top/config.mk
+++ b/flow/designs/nangate45/bp_be_top/config.mk
@@ -27,7 +27,6 @@ export CORE_AREA = 10.07 11.2 790 690
export PLACE_PINS_ARGS = -exclude left:500-800 -exclude right:500-800 -exclude top:*
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
export PLACE_DENSITY_LB_ADDON = 0.10
export TNS_END_PERCENT = 100
diff --git a/flow/designs/nangate45/bp_fe_top/config.mk b/flow/designs/nangate45/bp_fe_top/config.mk
index 8962d30efd..4b058d47b3 100644
--- a/flow/designs/nangate45/bp_fe_top/config.mk
+++ b/flow/designs/nangate45/bp_fe_top/config.mk
@@ -28,7 +28,6 @@ export PLACE_PINS_ARGS = -exclude left:400-700 -exclude right:400-700 -exclude t
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
export PLACE_DENSITY_LB_ADDON = 0.10
export PLACE_DENSITY_MAX_POST_HOLD = 0.12
diff --git a/flow/designs/nangate45/bp_multi_top/config.mk b/flow/designs/nangate45/bp_multi_top/config.mk
index 71ce929ee1..f67558854e 100644
--- a/flow/designs/nangate45/bp_multi_top/config.mk
+++ b/flow/designs/nangate45/bp_multi_top/config.mk
@@ -34,7 +34,6 @@ export CORE_AREA = 10.07 9.8 1090 1090
export PLACE_PINS_ARGS = -exclude left:100-1100 -exclude right:100-1100 -exclude top:*
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
export PLACE_DENSITY_LB_ADDON = 0.05
export SKIP_GATE_CLONING = 1
diff --git a/flow/designs/nangate45/bp_quad/config.mk b/flow/designs/nangate45/bp_quad/config.mk
index 4064f9bb17..fa71842a44 100644
--- a/flow/designs/nangate45/bp_quad/config.mk
+++ b/flow/designs/nangate45/bp_quad/config.mk
@@ -34,5 +34,4 @@ export CORE_AREA = 10 12 3590 3590
export PLACE_PINS_ARGS = -exclude left:* -exclude right:* -exclude top:* -exclude bottom:0-1000 -exclude bottom:2400-3600
-export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
+export MACRO_PLACE_HALO = 10 10
\ No newline at end of file
diff --git a/flow/designs/nangate45/mempool_group/config.mk b/flow/designs/nangate45/mempool_group/config.mk
index 50d4c1ee76..a0ee60b147 100644
--- a/flow/designs/nangate45/mempool_group/config.mk
+++ b/flow/designs/nangate45/mempool_group/config.mk
@@ -24,5 +24,4 @@ export CORE_AREA = 10 12 4390 4390
export PLACE_PINS_ARGS = -exclude left:* -exclude right:* -exclude top:* -exclude bottom:0-1000 -exclude bottom:3400-4400
-export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
+export MACRO_PLACE_HALO = 10 10
\ No newline at end of file
diff --git a/flow/designs/nangate45/swerv_wrapper/config.mk b/flow/designs/nangate45/swerv_wrapper/config.mk
index 22c5c7f834..5ca1e97189 100644
--- a/flow/designs/nangate45/swerv_wrapper/config.mk
+++ b/flow/designs/nangate45/swerv_wrapper/config.mk
@@ -24,7 +24,6 @@ export CORE_AREA = 10.07 11.2 1090 990
export PLACE_PINS_ARGS = -exclude left:* -exclude right:* -exclude top:* -exclude bottom:0-200 -exclude bottom:1000-1100
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
export PLACE_DENSITY_LB_ADDON = 0.10
export TNS_END_PERCENT = 100
diff --git a/flow/designs/sky130hd/chameleon_hier/config.mk b/flow/designs/sky130hd/chameleon_hier/config.mk
index cd63d0fa5b..fa8df5b6c5 100644
--- a/flow/designs/sky130hd/chameleon_hier/config.mk
+++ b/flow/designs/sky130hd/chameleon_hier/config.mk
@@ -41,7 +41,7 @@ export VERILOG_FILES = \
$(VERILOG_FILES_BLACKBOX)
export ENABLE_DPO = 0
-export MACRO_PLACE_CHANNEL = 160 160
+
export MACRO_PLACE_HALO = 160 160
export DIE_AREA = 0.0 0.0 6800 6800
export CORE_AREA = 200 200 6600 6600
diff --git a/flow/designs/sky130hd/microwatt/config.mk b/flow/designs/sky130hd/microwatt/config.mk
index 37d60ed2a1..9af0c549d8 100644
--- a/flow/designs/sky130hd/microwatt/config.mk
+++ b/flow/designs/sky130hd/microwatt/config.mk
@@ -24,7 +24,6 @@ export ADDITIONAL_LIBS = $(wildcard $(microwatt_DIR)/lib/*.lib)
export SYNTH_HIERARCHICAL = 1
export MACRO_PLACE_HALO = 100 100
-export MACRO_PLACE_CHANNEL = 200 200
# CTS tuning
export CTS_BUF_DISTANCE = 600
diff --git a/flow/designs/tsmc65lp/black_parrot/config.mk b/flow/designs/tsmc65lp/black_parrot/config.mk
index 62c0998b62..1e7ce2c7a6 100644
--- a/flow/designs/tsmc65lp/black_parrot/config.mk
+++ b/flow/designs/tsmc65lp/black_parrot/config.mk
@@ -38,6 +38,5 @@ export CORE_AREA = 10 12 1790 1591.2
export PLACE_PINS_ARGS = -exclude left:* -exclude right:* -exclude top:*
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
export PLACE_DENSITY_LB_ADDON = 0.10
diff --git a/flow/designs/tsmc65lp/bp_be_top/config.mk b/flow/designs/tsmc65lp/bp_be_top/config.mk
index 937ffce750..7947dde5d7 100644
--- a/flow/designs/tsmc65lp/bp_be_top/config.mk
+++ b/flow/designs/tsmc65lp/bp_be_top/config.mk
@@ -23,6 +23,5 @@ export CORE_AREA = 10 12 990 890
export PLACE_PINS_ARGS = -exclude left:0-500 -exclude right:0-500 -exclude bottom:*
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
export PLACE_DENSITY_LB_ADDON = 0.05
diff --git a/flow/designs/tsmc65lp/bp_fe_top/config.mk b/flow/designs/tsmc65lp/bp_fe_top/config.mk
index 5b5161a467..f87b9f423a 100644
--- a/flow/designs/tsmc65lp/bp_fe_top/config.mk
+++ b/flow/designs/tsmc65lp/bp_fe_top/config.mk
@@ -26,6 +26,5 @@ export CORE_AREA = 10 12 870 770
export PLACE_PINS_ARGS = -exclude left:* -exclude right:0-400 -exclude bottom:*
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
export PLACE_DENSITY_LB_ADDON = 0.05
diff --git a/flow/designs/tsmc65lp/bp_multi_top/config.mk b/flow/designs/tsmc65lp/bp_multi_top/config.mk
index 9e4d4aebad..8a4a16790a 100644
--- a/flow/designs/tsmc65lp/bp_multi_top/config.mk
+++ b/flow/designs/tsmc65lp/bp_multi_top/config.mk
@@ -42,6 +42,5 @@ export CORE_AREA = 10 12 1790 1590
export PLACE_PINS_ARGS = -exclude left:0-1400 -exclude right:0-1400 -exclude bottom:* -exclude top:0-100 -exclude top:1500-1600
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
export PLACE_DENSITY_LB_ADDON = 0.10
diff --git a/flow/designs/tsmc65lp/coyote/config.mk b/flow/designs/tsmc65lp/coyote/config.mk
index 2d52982f86..ea1c5b8ded 100644
--- a/flow/designs/tsmc65lp/coyote/config.mk
+++ b/flow/designs/tsmc65lp/coyote/config.mk
@@ -35,7 +35,6 @@ export CORE_AREA = 5 5 2245 2245
export PLACE_PINS_ARGS = -exclude left:* -exclude right:0-700 -exclude right:1500-2250 -exclude top:* -exclude bottom:*
export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
export PLACE_DENSITY_LB_ADDON = 0.10
export REMOVE_BUFFER_TREE = 1
diff --git a/flow/designs/tsmc65lp/swerv_wrapper/config.mk b/flow/designs/tsmc65lp/swerv_wrapper/config.mk
index 0b2ea6472b..2accb9f387 100644
--- a/flow/designs/tsmc65lp/swerv_wrapper/config.mk
+++ b/flow/designs/tsmc65lp/swerv_wrapper/config.mk
@@ -29,7 +29,6 @@ export DIE_AREA = 0 0 1610 1360
export CORE_AREA = 5 5 1605 1355
export PLACE_PINS_ARGS = -exclude left:* -exclude right:* -exclude top:* -exclude bottom:0-300 -exclude bottom:1300-1600
-export MACRO_PLACE_HALO = 10 10
-export MACRO_PLACE_CHANNEL = 20 20
+export MACRO_PLACE_HALO = 10 10
export PLACE_DENSITY_LB_ADDON = 0.10
diff --git a/flow/platforms/asap7/config.mk b/flow/platforms/asap7/config.mk
index f9b0ff1c3f..772ed4d79f 100644
--- a/flow/platforms/asap7/config.mk
+++ b/flow/platforms/asap7/config.mk
@@ -115,7 +115,6 @@ export IO_PLACER_H ?= M4
export IO_PLACER_V ?= M5
export MACRO_PLACE_HALO ?= 10 10
-export MACRO_PLACE_CHANNEL ?= 12 12
# the followings create a keep out / halo between
# macro and core rows
diff --git a/flow/platforms/gf180/config.mk b/flow/platforms/gf180/config.mk
index 1d2769dba7..dd21f4b0d9 100644
--- a/flow/platforms/gf180/config.mk
+++ b/flow/platforms/gf180/config.mk
@@ -79,7 +79,6 @@ export TAPCELL_TCL ?= $(PLATFORM_DIR)/openROAD/tapcell
# macro planning
export MACRO_PLACE_HALO ?= 10 10
-export MACRO_PLACE_CHANNEL ?= 20.16 20.16
#---------------------------------------------------------
# Place
diff --git a/flow/platforms/ihp-sg13g2/config.mk b/flow/platforms/ihp-sg13g2/config.mk
index f122dd627d..d8878455ab 100644
--- a/flow/platforms/ihp-sg13g2/config.mk
+++ b/flow/platforms/ihp-sg13g2/config.mk
@@ -79,7 +79,6 @@ export CORE_MARGIN ?= 16.5
export TAPCELL_TCL ?= $(PLATFORM_DIR)/tapcell.tcl
export MACRO_PLACE_HALO ?= 40 40
-export MACRO_PLACE_CHANNEL ?= 80 80
#---------------------------------------------------------
# Place
diff --git a/flow/platforms/nangate45/config.mk b/flow/platforms/nangate45/config.mk
index 9d1babbef5..70461a0b55 100644
--- a/flow/platforms/nangate45/config.mk
+++ b/flow/platforms/nangate45/config.mk
@@ -61,7 +61,6 @@ export TAPCELL_TCL ?= $(PLATFORM_DIR)/tapcell.tcl
export TAP_CELL_NAME = TAPCELL_X1
export MACRO_PLACE_HALO ?= 22.4 15.12
-export MACRO_PLACE_CHANNEL ?= 18.8 19.95
#---------------------------------------------------------
# Place
diff --git a/flow/platforms/sky130hd/config.mk b/flow/platforms/sky130hd/config.mk
index 24eb762fb2..9431290bb3 100644
--- a/flow/platforms/sky130hd/config.mk
+++ b/flow/platforms/sky130hd/config.mk
@@ -97,7 +97,6 @@ export TAP_CELL_NAME = sky130_fd_sc_hd__tapvpwrvgnd_1
export TAPCELL_TCL ?= $(PLATFORM_DIR)/tapcell.tcl
export MACRO_PLACE_HALO ?= 40 40
-export MACRO_PLACE_CHANNEL ?= 80 80
#---------------------------------------------------------
# Place
diff --git a/flow/platforms/sky130hs/config.mk b/flow/platforms/sky130hs/config.mk
index e8d3721421..9d3fa54ef4 100644
--- a/flow/platforms/sky130hs/config.mk
+++ b/flow/platforms/sky130hs/config.mk
@@ -59,7 +59,6 @@ export TAP_CELL_NAME = sky130_fd_sc_hs__tapvpwrvgnd_1
export TAPCELL_TCL ?= $(PLATFORM_DIR)/tapcell.tcl
export MACRO_PLACE_HALO ?= 40 40
-export MACRO_PLACE_CHANNEL ?= 80 80
#---------------------------------------------------------
# Place
diff --git a/flow/scripts/macro_place_util.tcl b/flow/scripts/macro_place_util.tcl
index 54bbff6ade..b347dcd743 100644
--- a/flow/scripts/macro_place_util.tcl
+++ b/flow/scripts/macro_place_util.tcl
@@ -18,12 +18,9 @@ if {[find_macros] != ""} {
}
lassign $::env(MACRO_PLACE_HALO) halo_x halo_y
- lassign $::env(MACRO_PLACE_CHANNEL) channel_x channel_y
set halo_max [expr max($halo_x, $halo_y)]
- set channel_max [expr max($channel_x, $channel_y)]
- set blockage_width [expr max($halo_max, $channel_max/2)]
+ set blockage_width $halo_max
-
if {[env_var_exists_and_non_empty MACRO_BLOCKAGE_HALO]} {
set blockage_width $::env(MACRO_BLOCKAGE_HALO)
}
diff --git a/flow/scripts/variables.yaml b/flow/scripts/variables.yaml
index 275b45c39a..51a93d28c9 100644
--- a/flow/scripts/variables.yaml
+++ b/flow/scripts/variables.yaml
@@ -269,13 +269,6 @@ MACRO_PLACE_HALO:
placement.
stages:
- floorplan
-MACRO_PLACE_CHANNEL:
- description: >
- Horizontal/vertical channel width between macros (microns). Used by
- automatic macro placement. Imagine channel=10 and halo=5. Then macros must
- be 10 apart but standard cells must be 5 away from a macro.
- stages:
- - floorplan
MACRO_BLOCKAGE_HALO:
description: >
Blockage width overridden from default calculation.