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traveler
Joined: 03 Jul 2002
Posts: 19
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 24 Jan 2003 4:23 help about STA scripts |
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| I have several clock in my design. They have different frequency. I have to set false path from clock to clock. The netlist pass the STA chencking, However, it failed in dynamic simulation. How could i solve this problem in my STA scripts?
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jkfoo
Joined: 17 May 2001
Posts: 37
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| 24 Jan 2003 14:07 |
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| Only if the clocks are unrelated to each other, then setting false path from clock to clock is ok. If it passes STA, you should not have any errors in dynamic simulation. Unless, the clocks are not exactly unrelated with each other or something wrong with your stimulus.
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jazz_roa
Joined: 21 Jan 2002
Posts: 21
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| 25 Jan 2003 0:50 |
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Ｙｏｕ ｍａｙ ｗａｎｔ ｔｏ ｐｅｒｆｏｒｍ ｔｈｅ ｄｙｎａｍｉｃ ｓｉｍｕｌａｔｉｏｎ ｗｉｔｈ ｔｈｅ ＳＤＦ ｆｉｌｅ。 Ｉｆ ｓｏ， ｙｏｕ ｈａｖｅ ｔｏ ｕｓｅ ｔｈｅ ｆｏｌｌｏｗｉｎｇ ｃｏｍｍａｎｄ ｉｎ ＤＣ ｏｒ ＰＴ ｔｏ ｗｒｉｔｅ ｏｕｔ ｔｈｅ ＳＤＦ ｆｉｌｅ ｗｉｔｈｏｕｔ ｔｉｍｉｎｇ ｃｈｅｃｋ ｂｅｔｗｅｅｎ ｔｈｅｓｅ ｔｗｏ ｃｌｏｃｋ ｄｏｍａｉｎｓ。
ｓｅｔ＿ａｎｏｎｎｏｔａｔｅｄ＿ｃｈｅｃｋ ０ －ｓｅｔｕｐ －ｈｏｌｄ －ｆｒｏｍ Ｘ －ｔｏ Ｙ
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Nobody
Joined: 04 Oct 2001
Posts: 250
Location: Formosa
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| 25 Jan 2003 3:30 |
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| dynamic sim can not handel cross clock domain , You will see some case propagate the unknow(x) signal in flip-flop with feedback mux with wrong behavior . As the pre-post said . comment out those cross domain timing check . I do it by hand to modify sdf file . Another issue is the test pattern could be shift one clock in testing real chip . You should tell the testing engineer to accept part as good die when it happened .
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