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我在使用Tmax 产生pattern run_drc时产生一个错误如下：
Chain path6 successfully traced with 144 scan_cells. Error: U_CORE/U_UART0/sbuf_rec_reg_0_ (14487) in chain path7 previously used in chain trace. (S5-1) Error: Design rules checking failed: cannot exit DRC command mode. (M100) Information: script 'script/tmax.tcl' stopped at line 31 due to error. (CMD-081) （详细如附件tmax.log） 然后我去查了我在做dft是的drc check （如下）
并没有S5的violation，scan也插入正常,还有我这个寄存器是在我的的可关断模块中 DRC Report Total violations: 27 ----------------------------------------------------------------- 4 MODELING VIOLATIONS 4 Cell has unknown model violations (TEST-451) 11 CLOCK VIOLATIONS 11 Clock as data different from capture clock for stable cell violations (C26) 8 SCAN CHAIN VIOLATIONS 8 Nonscan cell disturb violations (S19) 4 OTHER VIOLATIONS 4 Cell is constant 0 violations (TEST-504) Warning: Violations occurred during test design rule checking. (TEST-124) ----------------------------------------------------------------- Sequential Cell Report 111 out of 1271 sequential cells have violations(详细如附件post_drc.rpt) 然后我又去查了dft后产生的网表，发现tmax产生错误的寄存器sub_rec_0_的reset被接到了1 （TIMHIM），于是我手动把sub_rec_0_/reset端接到reset port ，然后在dft中做drc check时就会报错，也不会产生scan chain 错误如下，产生错误的是isolation cell，我用autofix也不能把这个violation消除 Begin Scan chain violations... Error: Chain path7 blocked at DFF gate U_CORE/test_so_UPF_ISO after tracing 0 cells. (S1-1) | 
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发表于 2012-7-17 15:44:05
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