参数的提取
命令是runQRC
,
也可以导出def，然后run 单独的qrc 来做
谢谢，直接在encounter里的timing菜单下的RC extraction里提取spef文件是不是不太精确?一般是用QRC参数对吧?
小编，帮我看下这个问题：
版图生成后用PT做STA，用于PT的tcl如下：
set search_path "."
set link_path "*fs90a_c_generic_core_ss2p25v125c.db fs90a_c_generic_core_tt2p5v25c.db coef_mem_ss.db coef_ram_wc.db data_ram_wc.db"
read_verilog /...eua2308_dap_ram_soc_12_01_30.v
current_design eua2308_dap_ram
link_design eua2308_dap_ram
set_min_library fs90a_c_generic_core_ss2p25v125c.db -min_version fs90a_c_generic_core_ff2p75vm40c.db
set_min_library data_ram_wc.db -min_version data_ram_bc.db
set_min_library coef_ram_wc.db -min_version coef_ram_bc.db
set_min_library coef_mem_ss.db -min_version coef_mem_ff.db
set_driving_cell -lib -cell DFFN -pin Q -no_design_rule [all_inputs] -library fs90a_c_generic_core_tt2p5v25c
set_wire_load_model -name enG50K -lib fs90a_c_generic_core_tt2p5v25c
set_wire_load_mode enclosed
set_operation_conditions -analysis_type on_chip_variation -min BBCOM -min fs90a_c_generic_core_ff2p75vm40c.db -max WWCOM -fs90a_c_generic_core_ss2p25v125c.db
create_clock_period 38 -waveform{0 19} PLL_CLK
set_load 5e-1[all_outputs]
set_drive 0 {PLL_CLK}
set_dont_touch_network {PLL_CLK}
set_propagated_clock [get_ports PLL_CLK]
set_clock_uncertainty -setup 0.3 [get_clocks PLL_CLK]
set_clock_uncertainty -hold 0.2 [get_clocks PLL_CLK]
set_input_delay 2 [remove_from_collection [all_inputs] [get_ports PLL_CLK]] -clock PLL_CLK
set_output_delay 1 [all_outputs] -clock PLL_CLK
然后执行read_parasticts /...eua2308_dap_ram12_01_30.spef语句结果出现以下
warning:unconnected hierarchy pin'eua2308_dap_u/eua2308_dap_control_u/no_cycle'is missing in the RC annotation for net
'eua2308_dap_u/eua2308_dap_control_u/no.cycle'
warning:unconnected hierarchy pin'eua2308_dap_u/eua2308_dap_control_u/sck_pos_edge'is missing in the RC annotation for net
'eua2308_dap_u/eua2308_dap_control_u/sck_pos_edge'
net typetotallumpedRC piRC networknot annotated
internal nets2193300216290
-driverless nets000231
-loadless nets00073
boundary/port nets180001800
-driverless nets0000
-loadless nets0000
221130021809304
再运行report_timing -delay min
report_timing -delay max
后出现warning
warning:some timing arcs have been disaabled for breaking timing loops or because of constant propagation
下面的相类似的warning很多，我只列了一个
warning:failed to compute c_effective for the timing arc(data_ram_wc/data_ram)data_ram_u/ck-->DO2(max_falling retain_rising)because the library data indicates a non_positive drive resistance
这些warning一定要排除吗?是什么原因引起的?怎么解决?麻烦帮我分析下。非常感谢
我直接在encounter中输入命令：runQRC 结果出现以下信息：
writing DEF file '.qx.def'
unitpermicron=1000,dbgmicrunperPBU=0.001000
unitperDBU=1.0000
DEF file'.qx.def' is written
'qrc'failed to finish successfully'
error:qrc failed
不知道怎么回事。
qrc参数提取是不是还要有qrc技术文件呀?看了下socuserguide,还是没弄懂怎么在encounter里提取qrc参数
最近正在学习怎么用qrc，标记下继续观望
当然需要有QRC techfile。
QRC的tch文件可以产生的吧?用什么来产生啊?
这个techfile可以用techGen产生，但是时间要很长
正在学，标记一下！
正在学习，mark一下