open-source-silicon.dev

<@U018LA3KZCJ> I am not clear on reason for reading SDC in Spef generation in openroad/or_rcx.tcl  scripts
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if {[catch {read_lef $::env(MERGED_LEF_UNPADDED)} errmsg]} {
    puts stderr $errmsg
    exit 1
}

if {[catch {read_def -order_wires $::env(CURRENT_DEF)} errmsg]} {
    puts stderr $errmsg
    exit 1
}

*read_sdc $::env(CURRENT_SDC)*
*set_propagated_clock [all_clocks]*

set rcx_flags ""
if { !$::env(RCX_MERGE_VIA_WIRE_RES) } {
    set rcx_flags "-no_merge_via_res"
}
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My understanding spef generation should be independent of SDC constraints ..
I don't see any difference between spef generated with SDC vs without SDC