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Hi, I was wondering how I could change metal layers for PDNs (by default, vertical PDN is on metal l...
# sky130
a
Hi, I was wondering how I could change metal layers for PDNs (by default, vertical PDN is on metal layer 4 and horizontal is on metal layer 5).
v
Are you using OpenLane?
Copy code
set ::env(FP_PDN_LOWER_LAYER) {met4}
set ::env(FP_PDN_RAILS_LAYER) {met1}
set ::env(FP_PDN_UPPER_LAYER) {met5}
Add this in your 
config.tcl
and update based on your need
a
Thank you, @Vijayan Krishnan. However, I wanted to decrease the number of layers to 3. I implemented these configurations: 
set ::env(GLB_RT_MAXLAYER) "3"
set ::env(GLB_RT_CLOCK_MAXLAYER) "3"
set ::env(FP_IO_HMETAL) "2"
set ::env(FP_IO_VMETAL) "1"
(I used numbers because if I use met1, or met2,... it gives me an error.) But still, I can not change the FDN layers with your configuration setups.
v
explore 
runs/<name>/config.tcl
for more such default configuration
@Ashkan https://github.com/The-OpenROAD-Project/OpenLane/blob/master/scripts/openroad/pdn_cfg.tcl customize this file and point to 
set ::env(PDN_CFG) $(DESIGN_DIR)/pdn_cfg.tcl
to use effective way
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