****************************************************************** MPW-TWO Project Owners If you have a project on MPW-TWO and you used OpenLane to harden your digital block(s), you should rerun timing checks to identify if you have any timing violations with respect to the issues identified on MPW-ONE. Below are the instructions to rerun timing: 1. Update Caravel — cd to the 

caravel

 do a 

git pull

2. Update OpenLane — run 

make openlane

 from the project root 3. Update the PDK — run 

make pdk

 from the project root 4. Create an SDC file if you do not already have one at openlane/<macro-name>/base.sdc. You can use the following file - just define CLOCK_PORT and CLOCK_PERIOD at the top of the file.

set ::env(CLOCK_PERIOD) <clock-period>
set ::env(CLOCK_PORT) <clock-port-name>
set ::env(IO_PCT) 0.2
set ::env(SYNTH_DRIVING_CELL) "sky130_fd_sc_hd__inv_1"
set ::env(SYNTH_DRIVING_CELL_PIN) "Y"
set ::env(SYNTH_CAP_LOAD) "33.5"
set ::env(SYNTH_MAX_FANOUT) "4"

create_clock [get_ports $::env(CLOCK_PORT)]  -name $::env(CLOCK_PORT)  -period $::env(CLOCK_PERIOD)
set_propagated_clock [get_clocks $::env(CLOCK_PORT)]

set input_delay_value [expr $::env(CLOCK_PERIOD) * $::env(IO_PCT)]
set output_delay_value [expr $::env(CLOCK_PERIOD) * $::env(IO_PCT)]
puts "\[INFO\]: Setting output delay to: $output_delay_value"
puts "\[INFO\]: Setting input delay to: $input_delay_value"

set_max_fanout $::env(SYNTH_MAX_FANOUT) [current_design]

set clk_indx [lsearch [all_inputs] [get_port $::env(CLOCK_PORT)]]
set all_inputs_wo_clk [lreplace [all_inputs] $clk_indx $clk_indx]
set all_inputs_wo_clk_rst $all_inputs_wo_clk


set_input_delay $input_delay_value  -clock [get_clocks $::env(CLOCK_PORT)] $all_inputs_wo_clk_rst
set_output_delay $output_delay_value  -clock [get_clocks $::env(CLOCK_PORT)] [all_outputs]

# TODO set this as parameter
set_driving_cell -lib_cell $::env(SYNTH_DRIVING_CELL) -pin $::env(SYNTH_DRIVING_CELL_PIN) [all_inputs]
set cap_load [expr $::env(SYNTH_CAP_LOAD) / 1000.0]
puts "\[INFO\]: Setting load to: $cap_load"
set_load  $cap_load [all_outputs]

Finally, run timing with the following commands from the project root…

export OPENLANE_ROOT=<openlane-root>
export CARAVEL_ROOT=$(pwd)/caravel
make rcx-<macro-name>

******************************************************************

Thanks @User. Could you also tell us the commits/tags etc you are expecting us to have after updating Caravel? For example you don't give a branch or tag, so if I do a git pull on my mpw2 caravel I won't get anything because my remote is my own repo.

i believe you are correct on the above. tag is mpw-3a