数字后端教程之Innovus report_property和get_property使用方法及应用案例

数字IC后端实现Innovus中使用report_property可以报告出各种各样object的属性，主要有cell，net，PG Net，Pin，时钟clock，时序库lib属性，Design属性，timing path，timin arc等属性。
在数字IC后端实现中我们写自动化脚本经常会使用这个命令来获取相关object的各种属性。因此很有必要向大家分享下report_property，get_property以及它们在实际项目中的应用。

数字IC后端笔试面试必备 | 低功耗设计实现十大灵魂拷问
数字后端innovus report_property属性
数字后端零基础入门系列 | Innovus零基础LAB学习Day10

report_property和get_property不同之处是它可以获取object对象的所有属性。

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数字IC后端实现之Innovus Place跑完density爆涨案例分析

1）报告具体instance的所有属性property
report_property [get_cells u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/U43987]

2）报告具体net的所有attribute
report_property [get_nets u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/FE_OFN148398_n86644 ]

通过report_property我们可以快速知道对应object对象的所有属性，这样我们可以通过get_property来获取object相关属性具体的值。

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比如我们可以通过下面的命令来快速获取某条net的driver pin。

innovus 183> get_property [get_nets u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/FE_OFN148398_n86644 ] driver_pins
u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/FE_OFC58904_n86644/ZN
innovus 184> get_object_name [get_property [get_nets u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/FE_OFN148398_n86644 ] driver_pins]
u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/FE_OFC58904_n86644/ZN

PS: 如果获取到的对象是指针，我们还可以通过get_object_name来获取指针对应的object名字。

3）获取pg net所有属性
report_property [get_pg_nets -of_objects u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/U43987]

report_property使用方法

4）报告lib cell相关属性
report_property [get_lib_cells -of_objects u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/U43987]

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比如获取具体instance对应lib cell的pin数量和lib中std_cell_main_rail_name属性。
innovus 207> get_property [get_lib_cells -of_objects CTS_ccl_inv_02172 ] pin_count 2
innovus 211> get_lib_cells -of_objects u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/U43987
tcbn28hpcplusbwp40p140ssg0p81v125c_ccs/AN2D2BWP40P1400xd9e9

innovus 212> get_property [get_lib_cells -of_objects u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/U43987] std_cell_main_rail_name
NA

5）报告具体instance所有timing arc
innovus 216> get_lib_arcs -of_objects [get_lib_cells tcbn28hpcplusbwp40p140ssg0p81v125c_ccs/AN2D2BWP40P140] 0xd9f4
report_property [ get_lib_arcs -of_objects [get_lib_cells tcbn28hpcplusbwp40p140ssg0p81v125c_ccs/AN2D2BWP40P140]]

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innovus 223> get_property [get_lib_arcs -of_objects [get_lib_cells
tcbn28hpcplusbwp40p140ssg0p81v125c_ccs/AN2D2BWP40P140]] from_lib_pin
tcbn28hpcplusbwp40p140ssg0p81v125c_ccs/AN2D2BWP40P140/A1

tcbn28hpcplusbwp40p140ssg0p81v125c_ccs/AN2D2BWP40P140/A2
0xda10

innovus 224> get_property [get_lib_arcs -of_objects [get_lib_cells tcbn28hpcplusbwp40p140ssg0p81v125c_ccs/AN2D2BWP40P140]] to_lib_pin
tcbn28hpcplusbwp40p140ssg0p81v125c_ccs/AN2D2BWP40P140/Z tcbn28hpcplusbwp40p140ssg0p81v125c_ccs/AN2D2BWP40P140/Z0xda15

6）报告timing path相关cell，pin属性

innovus 226> **set path [report_timing -to u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/g_cpu_0__u_cpuslv_u_dw_dw_data_buff_reg_0__10_/D -collection ]

0xda17**
innovus 227> foreach_in_collection path1 $path {set points [get_property $path1 timing_points]}

innovus 228> puts $points

0xda1a

下面通过get_property来获取timing path上各个pin。当然我们还可以改装成获取timing path上的所有instance和对应的cell name。

咱们社区低功耗四核A7Top对common clock path做clock shielding就是先抓出这条clock path上的所有pin，然后对每一段clock net设置net attribute完成ndr和shielding的处理。

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innovus 230> get_property $points pinpd_a7_0_dwn_clamp_n

u_cortexa7/FE_OFC15517_pd_a7_0_dwn_clamp_n/I u_cortexa7/FE_OFC15517_pd_a7_0_dwn_clamp_n/ZN u_cortexa7/FE_OCPC17521_FE_OFN146884_n/I u_cortexa7/FE_OCPC17521_FE_OFN146884_n/ZN u_cortexa7/FE_OCPC17522_FE_OFN146884_n/I u_cortexa7/FE_OCPC17522_FE_OFN146884_n/ZN u_cortexa7/FE_OCPC17523_FE_OFN146884_n/I u_cortexa7/FE_OCPC17523_FE_OFN146884_n/ZN u_cortexa7/FE_OCPC17529_FE_OFN114_FE_DBTN0_pd_a7_0_dwn_clamp_n/I u_cortexa7/FE_OCPC17529_FE_OFN114_FE_DBTN0_pd_a7_0_dwn_clamp_n/ZN u_cortexa7/FE_OCPC17530_FE_OFN114_FE_DBTN0_pd_a7_0_dwn_clamp_n/I u_cortexa7/FE_OCPC17530_FE_OFN114_FE_DBTN0_pd_a7_0_dwn_clamp_n/ZN u_cortexa7/FE_OCPC17531_FE_OFN114_FE_DBTN0_pd_a7_0_dwn_clamp_n/I u_cortexa7/FE_OCPC17531_FE_OFN114_FE_DBTN0_pd_a7_0_dwn_clamp_n/ZN u_cortexa7/FE_OCPC17532_FE_OFN114_FE_DBTN0_pd_a7_0_dwn_clamp_n/I u_cortexa7/FE_OCPC17532_FE_OFN114_FE_DBTN0_pd_a7_0_dwn_clamp_n/ZN u_cortexa7/FE_OFC39_pd_a7_0_dwn_clamp_n/I u_cortexa7/FE_OFC39_pd_a7_0_dwn_clamp_n/ZN u_cortexa7/FE_OFC13540_FE_OCPN156551/I u_cortexa7/FE_OFC13540_FE_OCPN156551/Z u_cortexa7/FE_OCPC17888_FE_OFN158805_n/I u_cortexa7/FE_OCPC17888_FE_OFN158805_n/ZN u_cortexa7/FE_OCPC18349_FE_OFN161153_n/I u_cortexa7/FE_OCPC18349_FE_OFN161153_n/ZN u_cortexa7/FE_OCPC18350_FE_OFN161153_n/I u_cortexa7/FE_OCPC18350_FE_OFN161153_n/Z u_cortexa7/snps_CPU0__CPU02MP_LOW_snps_biu_dw_data_o_10__UPF_ISO/ISO u_cortexa7/snps_CPU0__CPU02MP_LOW_snps_biu_dw_data_o_10__UPF_ISO/Z u_cortexa7/FE_OCPC97807_biu_cpu0_dw_data_10/I u_cortexa7/FE_OCPC97807_biu_cpu0_dw_data_10/Z u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/g_cpu_0__u_cpuslv_u_dw_dw_data_buff_reg_0__10_/D

foreach_in_collection path1 $path {set attributes [report_property $path1 ]}

下面我们在innovus中报告前面那条timing path的setup时序，看看setup是否和通过get_property获取到的值一致。结果表明完全一样。

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report_timing -to u_cortexa7/u_cortexa7l2/u_cortexa7l2noram/u_ca7scu/g_cpu_0__u_cpuslv_u_dw_dw_data_buff_reg_0__10_/D

典型案例1：
抓取特定timing path的逻辑深度。这个可以用来快速判断逻辑关键路径和物理关键路径是否一致！

proc report_logic_depth {timing_path} {   set total_logic_depth [get_property $timing_path num_cell_arcs]   set bufinv 0   foreach_in_collection tp [get_property [get_property $timing_path timing_points] pin] {       if { [get_property $tp object_type]=="pin" && [sizeof_collection [filter_collection [get_cells -of_object $tp] "is_buffer==true||is_inverter==true"]]} { incr bufinv }}   return [list  $total_logic_depth [expr $bufinv/2]]}

像咱们社区cortexa7core后端训练营项目中这条timing path，我们使用上述脚本快速获取data path的逻辑深度和buffer，inverter数量。通过输出结果我们就可以知道当前这条timing path是有大问题的！

Output:Total logic depth of path: 21
Count of buf/inv in path: 9

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典型案例2：

这个案例使用get_property，get_arcs等命令来获取某个view下某条net的delay情况。而且我们还可以稍作改进修改成抓取design中net delay大于特定数值的net list。

proc get_arc_delay {netName viewName} {set net [ get_nets -hier $netName]foreach_in_collection net_coll $net {set netObj [get_object_name $net_coll]puts ""puts "########################################"puts "Delay parameters for net $netObj "set drv [ get_object_name [ get_property [get_nets $netObj ] driver_pins ] ]set drv1 [ get_property [get_nets $netObj ] driver_pins ]set load [ get_property [get_nets $netObj ] load_pins ]set load_col [ sizeof_collection $load ]set drv_col [ sizeof_collection $drv1 ]
if { $load_col >= 1 && $drv_col >=1 } {foreach_in_collection lPin $load {set name [ get_object_name $lPin ]set netArcCollection [get_arcs -from $drv -to $name]
foreach_in_collection arc $netArcCollection  {set del_max_rise [get_property $arc delay_max_rise -view $viewName]set del_max_fall [get_property $arc delay_max_fall -view $viewName]set del_min_rise [get_property $arc delay_min_rise -view $viewName]set del_min_fall [get_property $arc delay_min_fall -view $viewName]
puts "########################################"puts "Arc from $drv to $name:Delay_max_rise: $del_max_rise Delay_max_fall: $del_max_fall Delay_min_rise: $del_min_rise Delay_min_fall: $del_min_fall"    }   }  }}}