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Drop REMOVE_ABC_BUFFERS from designs that no longer need it #4575

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Drop REMOVE_ABC_BUFFERS from designs that no longer need it #4575

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ee1e5e5
Drop REMOVE_ABC_BUFFERS from designs that no longer need it
oharboe Sep 29, 2026
e0a84b2
variables: clarify why REMOVE_ABC_BUFFERS is still set
oharboe Sep 29, 2026
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2 changes: 1 addition & 1 deletion docs/user/FlowVariables.md
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Expand Up @@ -246,7 +246,7 @@ configuration file.
| <a name="PWR_NETS_VOLTAGES"></a>PWR_NETS_VOLTAGES| Used for IR Drop calculation.| |
| <a name="RCX_RULES"></a>RCX_RULES| RC Extraction rules file path.| |
| <a name="RECOVER_POWER"></a>RECOVER_POWER| Specifies how many percent of paths with positive slacks can be slowed for power savings [0-100].| 0|
| <a name="REMOVE_ABC_BUFFERS"></a>REMOVE_ABC_BUFFERS (deprecated)| Remove abc buffers from the netlist. If timing repair in floorplanning is taking too long, use a SETUP/HOLD_SLACK_MARGIN to terminate timing repair early instead of using REMOVE_ABC_BUFFERS or set SKIP_LAST_GASP=1.| 0|
| <a name="REMOVE_ABC_BUFFERS"></a>REMOVE_ABC_BUFFERS (deprecated)| Remove abc buffers from the netlist. If timing repair in floorplanning is taking too long, use a SETUP/HOLD_SLACK_MARGIN to terminate timing repair early instead of using REMOVE_ABC_BUFFERS or set SKIP_LAST_GASP=1. Some designs still need it to reach their QoR targets.| 0|
| <a name="REMOVE_CELLS_FOR_LEC"></a>REMOVE_CELLS_FOR_LEC| String patterns directly passed to write_verilog -remove_cells <> for lec checks.| |
| <a name="REPAIR_PDN_VIA_LAYER"></a>REPAIR_PDN_VIA_LAYER| Remove power grid vias which generate DRC violations after detailed routing.| |
| <a name="REPORT_CLOCK_SKEW"></a>REPORT_CLOCK_SKEW| Report clock skew as part of reporting metrics, starting at CTS, before which there is no clock skew. This metric can be quite time-consuming, so it can be useful to disable.| 1|
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2 changes: 0 additions & 2 deletions flow/designs/sky130hd/aes/config.mk
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Expand Up @@ -16,8 +16,6 @@ export TNS_END_PERCENT = 100

export FASTROUTE_TCL = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/fastroute.tcl

export REMOVE_ABC_BUFFERS = 1

export CTS_CLUSTER_SIZE = 20
export CTS_CLUSTER_DIAMETER = 50

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3 changes: 0 additions & 3 deletions flow/designs/sky130hd/jpeg/config.mk
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Expand Up @@ -11,6 +11,3 @@ export PLACE_DENSITY_LB_ADDON = 0.15
export TNS_END_PERCENT = 100

export FASTROUTE_TCL = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/fastroute.tcl

export REMOVE_ABC_BUFFERS = 1

2 changes: 0 additions & 2 deletions flow/designs/sky130hs/aes/config.mk
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Expand Up @@ -12,8 +12,6 @@ export CORE_MARGIN = 2
export PLACE_DENSITY_LB_ADDON = 0.25
export TNS_END_PERCENT = 100

export REMOVE_ABC_BUFFERS = 1

export CTS_CLUSTER_SIZE = 10
export CTS_CLUSTER_DIAMETER = 50

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2 changes: 1 addition & 1 deletion flow/scripts/variables.json
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1 change: 1 addition & 0 deletions flow/scripts/variables.yaml
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Expand Up @@ -512,6 +512,7 @@ REMOVE_ABC_BUFFERS:
Remove abc buffers from the netlist. If timing repair in floorplanning is
taking too long, use a SETUP/HOLD_SLACK_MARGIN to terminate timing repair early
instead of using REMOVE_ABC_BUFFERS or set SKIP_LAST_GASP=1.
Some designs still need it to reach their QoR targets.
stages:
- floorplan
deprecated: 1
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