UDTP(user defined test point)
指示DFTC在设计中用户指定的位置插入控制点和观察点
1.为什么要使用UDTP？
修复无法控制的clock和/或asynch pins；
增加设计的测试覆盖率；
减少pattern数量
2.UDTP的类型
①Force
force_0、force_1、force_01、force_z0、force_z1、force_z01
②Control
control_0、control_1、control_01、control_z0、control_z1、 control_z01
③Observe
observe
3.使用set_test_point_element
set_test_point_element [pin list] -type <test_point_type>
pin list指定了插入UDTP的位置，type只可指定一种类型的type
4.示例——定义control and clock signals
control signals
需要先定义过testmode或scanenable
set_test_point_element pin_list -type control_01 -control_signal port_name l pin_name
clock signals
需要先定义过scanclock
set_test_point_element pin_list -type control_01 -clock_signal port_name | pin_name
#Read in the design and synthesize it acs_read hdl -hdl_source ./rt1/verilog A_DESGN llink compile -scan #Define the clocks and asynchs in the design set_dft_signal -type scanclock -view exist -timing {45 55] -port CLK1 set_dft_signal -type scanclock -view exist -timing { 45 55] -port CLK2 set_dft_signal -type Reset -view exist -active 0 -port RST_N set_dft_signal -type TestMode -active 1 -port TM set_scan_configuration -chain_count 10 . . . #UDTP specification. Specify observe and control TPs #Turn power saving ON for observe test points set_test_point_element -type observe -power_saving enable -clock_signal CLK1 {alpha_1/Q beta_5/out gamma_3/Q} #use an existing clock as clock signal and existing port as control signal for control TP set_test_point_element -type control_1 {u3/omega_2/q alpha_7/Q} -clock_siqnal CLK2 -control_siqnal TM #Run pre-DRC create_test_protocol -capture_procedure multi_clock dft_drc -verbose #Preview the scan chains preview_dft -show all -test_points all #scan insertion insert_dft #Run post-DRC dft_drc -verbose report_scan_ path -view exist #write out the netlist change_names -rules verilog -hier write -hier -f ddc -out A_DESIGN_udtp_scan.ddc write -hier -f verilog -out TEST_udtp_scan.v