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dc_shell-t -f ./scripts/seg_drive.tcl > 1
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set active_design seg_drive //×¢Ò⣺ÏàµÈÓÚÒ»¸öºê¶¨Ò壬ÓÃactive_design´úÌæseg_drive read_verilog {encode_seg.v number_mod.v scan.v seg_drive.v} //read_fileÒ²¿ÉÒÔ£¬Ëü¿ÉÒÔ¶Á¶àÖÖ¸ñʽÎļþ£¬°üÀ¨.db
#analyze -format verilog {encode_seg.v number_mod.v scan.v seg_drive.v}
#elaborate $active_design //×¢ÒâÕâÀïÊÇ$active_design
current_design $active_design //½«¶¥²ãÉèÖóɵ±Ç°Éè¼Æ link
//read_verilogÃüÁîÓë ºóÃæµÄanalyze¡¢elaborate¹¦ÄÜÏàͬ£¬¿ÉÒÔÑ¡ÔñÆäÖÐÒ»¸ö£»²Î¿´ ¡¶ASIC×ÛºÏÓëDCʹÓá·£º
set_svf ./mapped/svf/$active_design.svf //û²é
###############################################1 # Define the Design Environment
#1
###############################################1
13Modeling the System InterfaceÉèÖÃϵͳ½Ó¿Ú2
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set_operating_conditions slow //É趨һ¸ö¿âµÄ»·¾³£¬¿âÄÚ°üº¬Ê¹ÓÃζȡ¢µçѹ¡¢µçÂ·ÌØÕ÷Ïß
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2£©set_wire_load_model ¨Cname model_name ¨Clib_name library ¨Cmax ¨Cmin//É趨Ï߸ºÔØÄ£ÐÍ
set_wire_load_model -name tsmc090_wl40 -library slow //±íʾʹÓÿâslowÀïµÄ
tsmc090_wl40ÏßÄ£ÐÍ
Èç¹ûûÓÐ wire_load_model£¬¿ÉÒÔ½« auto_wire_load_selection ²ÎÊýÉèÖÃΪ true,Ôò DC ×Ô¶¯¸ù¾Ý×ÛºÏÖ®ºóµÄÃæ»ýÀ´Ñ¡ÔñÒ»¸öͳ¼ÆµÄÏ߸ºÔØÄ£ÐÍÓÃÓÚ¹À¼ÆÁ¬ÏßÑÓ³Ù¡£ set auto_wire_load_selection true
set_wire_load_mode enclosed //¿çÄ£¿éÏ߸ºÔØÄ£Ê½Ñ¡Ôñ
3£©Modeling the System InterfaceÉèÖÃϵͳ½Ó¿Ú
Êä³ö¶Ë£ºÉèÖÃset_load
ÓÉÓÚÍⲿµç·µÄ¸ºÔؽ«»áÓ°Ïìµ½½Óµ½¶Ë¿ÚÉϵ¥Ôªµç·µÄÑÓ³Ù£¨ÕâÀïÉèÖõÄÊǵçÈÝÖµ£©£¬Òò´Ë£¬ ÐèÒª¶Ô¶Ë¿ÚµÄ´ø¸ºÔØÄÜÁ¦×öÏÞÖÆ¡£ÎªÁ˱ȽϾ«È·µØ¼ÆËãÊä³öµç·µÄÑÓ³Ù£¬ DCÐèÒªÖªµÀÊä³öµç·Çý¶¯µÄËùÓиºÔØ¡£²Î¿´p144
²Î¿´@@Design Compiler User Guide 2010.03 p44
È磺set_load [load_of ssc_core_slow/buf1a2/A] [all_outputs]
set_load [expr 4*[load_of DICE_DELAY_DFF_RN_slow/DICE_DELAY_DFF_RN/D]] [all_outputs]
ÊäÈë¶Ë£ºÉèÖÃset_driving_cell
set_driving_cell -lib_cell DICE_DELAY_DFF_RN -pin Q ¨Clibrary DICE_DELAY_DFF_RN_slow [all_inputs]
set_drive 0 [list clk_62_5M rst_n] //²Î¼ûDesign Compiler User Guide 2010.03.pdf 144Ò³
ΪÁ˸ü¼Ó¾«È·µÄ¹À¼ÆÊäÈëµç·µÄÑÓ³Ù£¬ DCÐèÒªÖªµÀÐźŵ½´ïÊäÈë¶Ë
¿ÚµÄ¹ý¶Éʱ¼ä£¨transition time£© ¡£set_drive ʹÓÃÒ»¸öÈ·¶¨µÄÖµÀ´¹À¼ÆÊäÈë¶ËµÄÊäÈëµç×裬
´Ó¶øµÃµ½ÊäÈë¶Ë¿ÚµÄÑÓ³Ù£»¶ø set_driving_cell ÊǼٶ¨Ò»¸öʵ¼ÊµÄÇý¶¯µ¥ÔªÀ´¹À¼ÆÊäÈëµÄ transtion time£ºTime = arrive_time + drive*net_load +connect_delay dc_shell> current_design top_level_design dc_shell> set_drive 1.5 {I1 I2}
dc_shell> current_design sub_design2 //×¢ÒâÇл»µ±Ç°Éè¼Æ dc_shell> set_driving_cell -lib_cell IV {I3}
dc_shell> set_driving_cell -lib_cell AN2 -pin Z -from_pin B {I4}
################################### # Design constraint
#
###################################