Hi, What does this warning mean,

[WARNING]: All internal macros will not be connected to power.

I can visually see that no power pins of the macro have been imported during the PDN. I also checked and the pins are defined in the LEF file Is there some flag I have to set manually ? @Matt Venn

Can you show met5 and via4?

I just checked the final GDS and it has connections to power and ground..

Np

Would be good if you can create an issue to see if the warning can be removed

From

tcl_commands/floorplan.tcl

if { $::env(FP_PDN_ENABLE_MACROS_GRID) == 1 } {
                        # if macros connections to power are explicitly set
                        # default behavoir macro pins will be connected to the first power domain
                        if { [info exists ::env(FP_PDN_MACRO_HOOKS)] } {
                                set ::env(FP_PDN_ENABLE_MACROS_GRID) 0
                                foreach {instance_name hooks} $macro_hooks {
                                        set power [lindex $hooks 0]
                                        set ground [lindex $hooks 1]
                                        if { $power == $::env(VDD_NET) && $ground == $::env(GND_NET) } {
                                                set ::env(FP_PDN_ENABLE_MACROS_GRID) 1
                                                puts_info "Connecting $instance_name to $power and $ground nets."
                                                lappend ::env(FP_PDN_MACROS) $instance_name
                                        }
                                }
                        }
                } else {
                        puts_warn "All internal macros will not be connected to power."
                }

                gen_pdn

                set ::env(FP_PDN_ENABLE_RAILS) 0
                set ::env(FP_PDN_ENABLE_MACROS_GRID) 0

The error message

All internal macros will not be connected to power.

occurs when

FP_PDN_ENABLE_MACROS_GRID

is

0

. So the first time through, if

FP_PDN_ENABLE_MACROS_GRID

is

1

,

FP_PDN_MACROS

will be set. But after

gen_pdn

,

FP_PDN_ENABLE_MACROS_GRID

is set to

0

, so subsequent runs may not pick up changes to the

FP_PDN_MACROS

. You could try running in a new

runs

directory or deleting the

runs/tag/config.tcl

file.

I'll take a look.

Caravel user area PDN has two Digital and two analog voltage networks, each fed from either left or right side of Caravel harness. Most of design macros are connected with only one network, a choice made by using VDD_NETS and GND_NETS in macro-related config.tcl. Obviously, macros are not connected with rest of power networks, thus have exactly three sets of warnings.

So the warnings are erroneous and should probably be removed in the case when there are no macros connected to the other supplies

@Matt Venn Are you seeing 3 sets of warnings?

Yes

@Matt Venn in my opinion, these warning are affirmation of correct PDN connectivity. The misleading nature of these warnings can be cured by listing the resulting macro-Powernet mapping. I will submit a patch to openlane.

Thank you!

Maybe a message like

[WARNING]: No internal macros will not be connected to power vccd2/vssd2.

would be more informative.

Will be ( avoid double negative)

Or "[WARNING]: Macros a, b, c will not be connected to power vccd2/vssd2.