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Add CTS_DISTANCE_BETWEEN_BUFFERS option (#1018)

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+ Add CTS_DISTANCE_BETWEEN_BUFFERS, which is passed on to TritonCTS
This commit is contained in:
Anton Blanchard
2022-03-22 21:38:48 +11:00
committed by GitHub
parent de4af65009
commit 08e650bfc0
3 changed files with 7 additions and 1 deletions
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1
configuration/README.md
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@@ -163,6 +163,7 @@ These variables worked initially, but they were too sky130 specific and will be
| `CTS_REPORT_TIMING` | Specifies whether or not to run STA after clock tree synthesis using OpenROAD's estimate_parasitics -placement and generates reports under `logs/cts`. 1 = Enabled, 0 = Disabled. <br> (Default: `1`) |
| `CTS_CLK_MAX_WIRE_LENGTH` | Specifies the maximum wire length on the clock net. Value in microns. <br> (Default: `0`) |
| `CTS_DISABLE_POST_PROCESSING` | Specifies whether or not to disable post cts processing for outlier sinks. <br> (Default: `0`) |
| `CTS_DISTANCE_BETWEEN_BUFFERS` | Specifies the distance (in microns) between buffers when creating the clock tree (Default: `0`) |
| `LIB_CTS` | The liberty file used for CTS. By default, this is the `LIB_SYNTH_COMPLETE` minus the cells with drc errors as specified by the drc exclude list. <br> (Default: `$::env(cts_tmpfiles)/cts.lib`) |
### Routing

3
configuration/cts.tcl
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@@ -20,4 +20,5 @@ set ::env(CTS_SINK_CLUSTERING_SIZE) 25
set ::env(CTS_SINK_CLUSTERING_MAX_DIAMETER) 50
set ::env(CTS_REPORT_TIMING) 1
set ::env(CTS_CLK_MAX_WIRE_LENGTH) 0
set ::env(CTS_DISABLE_POST_PROCESSING) 0
set ::env(CTS_DISABLE_POST_PROCESSING) 0
set ::env(CTS_DISTANCE_BETWEEN_BUFFERS) 0

4
scripts/openroad/cts.tcl
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@@ -62,6 +62,10 @@ lappend arg_list -sink_clustering_size $::env(CTS_SINK_CLUSTERING_SIZE)
lappend arg_list -sink_clustering_max_diameter $::env(CTS_SINK_CLUSTERING_MAX_DIAMETER)
lappend arg_list -sink_clustering_enable
if { $::env(CTS_DISTANCE_BETWEEN_BUFFERS) != 0 } {
lappend arg_list -distance_between_buffers $::env(CTS_DISTANCE_BETWEEN_BUFFERS)
}
if { $::env(CTS_DISABLE_POST_PROCESSING) } {
lappend arg_list -post_cts_disable
}