+ add `caravel_core` (2b8e7b7) STA signoff

signoff/caravel_core/caravel_core.sdc

@@ -0,0 +1,69 @@
+### Caravel Core Signoff SDC
+### Rev 1
+### Date: 12/2/2023
+
+
+## MASTER CLOCKS
+set clk_period 25
+create_clock -name clk -period $clk_period [get_ports {clock_core}] 
+puts "\[INFO\]: Systemn clock period: $clk_period"
+
+create_clock -name hk_serial_clk -period 100 [get_pins {housekeeping/serial_clock}]
+create_clock -name hk_serial_load -period 1000 [get_pins {housekeeping/serial_load}]
+set_clock_uncertainty 0.1000 [get_clocks {clk hk_serial_clk hk_serial_load}]
+set_propagated_clock [get_clocks {clk hk_serial_clk hk_serial_load}]
+
+# ## INPUT/OUTPUT DELAYS
+set input_delay_value 4
+set output_delay_value 4
+puts "\[INFO\]: Setting output delay to: $output_delay_value"
+puts "\[INFO\]: Setting input delay to: $input_delay_value"
+set_input_delay $input_delay_value -clock [get_clocks {clk}] [all_inputs]
+set_input_delay 0 [get_ports {clock_core}]
+set_output_delay $output_delay_value -clock [get_clocks {clk}] [all_outputs]
+
+# deassert hkspi_disable
+set_case_analysis 0 [get_pins {housekeeping/_6817_/Q}]
+create_clock -name hkspi_clk -period 100 [get_ports {mprj_io_in[4]}] 
+set_input_delay 0 [get_ports {mprj_io_in[4]}]
+set_clock_uncertainty 0.1000 [get_clocks {hkspi_clk}]
+set_propagated_clock [get_clocks {hkspi_clk}]
+set_clock_groups \
+   -name clock_group \
+   -logically_exclusive \
+   -group [get_clocks {clk}]\
+   -group [get_clocks {hk_serial_clk}]\
+   -group [get_clocks {hk_serial_load}]\
+   -group [get_clocks {hkspi_clk}]
+
+set_max_fanout 18 [current_design]
+# synthesis max fanout is 18 
+
+## FALSE PATHS (ASYNCHRONOUS INPUTS)
+set_false_path -from [get_ports {rstb_h}]
+
+set_false_path -from [get_ports {gpio_in_core}]
+
+# add loads for output ports (pads)
+# pad input pin cap 0.036793 (pin OUT of pad sky130_ef_io__gpiov2_pad_wrapped)
+set out_cap 0.036793
+puts "\[INFO\]: Cap load range: $out_cap"
+set_load $out_cap [all_outputs]
+
+#add input transition for the inputs ports (pads)
+# pad output pin transition range is 0.08:1.5 (pin IN of pad sky130_ef_io__gpiov2_pad_wrapped)
+set min_in_tran 0.08
+set max_in_tran 1.5
+puts "\[INFO\]: Input transition range: $min_in_tran : $max_in_tran"
+set_input_transition -min $min_in_tran [all_inputs] 
+set_input_transition -min 0 [get_ports v*]
+set_input_transition -min 0 [get_ports {clock_core}]
+set_input_transition -max $max_in_tran [all_inputs]
+set_input_transition -max 0 [get_ports v*]
+set_input_transition -max 0 [get_ports {clock_core}]
+
+# check ocv table (not provided) 
+set derate 0.0375
+puts "\[INFO\]: Setting derate factor to: [expr $derate * 100] %"
+set_timing_derate -early [expr 1-$derate]
+set_timing_derate -late [expr 1+$derate]

signoff/caravel_core/signoff.rpt

@@ -0,0 +1,9 @@
+caravel_core-f-nom-sta STA:    Passed
+caravel_core-s-min-sta STA:    Failed (in2reg hold)
+caravel_core-t-nom-sta STA:    Passed (except: max_tran)
+caravel_core-s-nom-sta STA:    Failed (in2reg hold)
+caravel_core-s-max-sta STA:    Failed (in2reg hold)
+caravel_core-t-max-sta STA:    Passed (except: max_tran & max_cap)
+caravel_core-f-min-sta STA:    Passed
+caravel_core-t-min-sta STA:    Passed
+caravel_core-f-max-sta STA:    Passed