scan compress 实践

1.read_gate_and_protocol

read_ddc mapped/ORCA.ddc ;# note this was created during the unmapped flow
current_design ORCA
link

#source -echo -verbose scripts/settings_protocol.tcl
#specify test components in preparation for create_test_protocol

set test_default_delay 0
set test_default_bidir_delay 0
set test_default_strobe 40

set_dft_signal -view existing_dft -type ScanClock -timing {45 55} -port {pclk sdr_clk sys_clk}
set_dft_signal -view existing_dft -port prst_n -type Reset -active_state 0
set_dft_signal -view spec -port scan_en -type ScanEnable -active_state 1
set_dft_signal -view existing_dft -type Constant -active_state 1 -port test_mode


create_test_protocol

dft_drc 

2.preview_dft

source -echo -ver scripts/settings_insert_dft.tcl 
remove_test_protocol
create_test_protocol
dft_drc
preview_dft -show scan_summary

# This script insert the scan chains

# Scan synthesis and autofix settings
set_dft_insertion_configuration -synthesis none -preserve_design_name true
set_autofix_configuration -type bidirectional -method input

# allow clock domains to be mixed together on same chain

set_scan_configuration -chain_count 5 -add_lockup true -clock_mixing mix_clocks

# Specify all scan ports

for {set i 0} {$i < 5 } {incr i} {
    set hookup_cell pad_iopad_$i
    set_dft_signal -view spec -port pad[$i] -type ScanDataIn -hookup_pin $hookup_cell/CIN
    set hookup_cell sdram_A_iopad_$i
    set_dft_signal -view spec -port sd_A[$i] -type ScanDataOut -hookup_pin $hookup_cell/I
    set_scan_path chain$i -view spec -scan_data_in pad[$i] -scan_data_out sd_A[$i] 
}

#
### Enable Adaptive scan HERE
#
set_dft_configuration -scan_compression enable

#
### Specify compression ratio HERE
#
set_scan_compression_configuration -minimum_compression 5 

#
### Add TM_COMP port HERE
#
create_port -direction in TM_COMP
set_dft_signal -view spec -type TestMode -port TM_COMP

3.insert_dft

set compile_instance_name_prefix DFTC_
insert_dft
current_test_mode Internal_scan
dft_drc
current_test_mode ScanCompression_mode
dft_drc 

4.handoff

change_names -rule verilog -hierarchy
report_dft > reports/dft
report_scan_configuration > reports/scan_config
report_dft_signal -view existing_dft > reports/dft_signals
report_scan_path -view existing_dft -chain all > reports/scan_chains
report_scan_path -view existing_dft -cell all > reports/scan_cells

# hand off
set test_stil_netlist_format verilog
write -hierarchy -format verilog -output tmax/ORCA_COMP_scan.v
write -hierarchy -format ddc     -output mapped_scan/ORCA_COMP.ddc

# Write Internal_scan protocol:
write_test_protocol -out ./tmax/scan.spf 
  -test_mode Internal_scan

# Write ScanCompression_mode protocol:
write_test_protocol -out ./tmax/scancompress.spf 
  -test_mode ScanCompression_mode