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小弟在用encounter布局布线后,用它产生的网表做PT时序分析,但结果有很多时序违例. 确实hold的违例..有人提醒说是我的复位信号reset的问题,要在布局之前就对reset复位信号前加buf.............①不知道是不是这个原因才导致hold违例这么多... .②还想请教一下.在reset信号前如何加buf呢??用命令还是图形界面呢??
请各位指教一下..多谢了Report : constraint
-all_violators
-path slack_only
Design : sigma
Version: C-2009.06-SP3
Date : Mon Jan 14 14:53:28 2013
****************************************
min_delay/hold ('clk' group)
Endpoint Slack
-----------------------------------------------------------------
u1/b0_reg/RN -2.45 (VIOLATED)
u1/b4_reg/RN -2.45 (VIOLATED)
u1/b1_reg/RN -2.45 (VIOLATED)
u1/b2_reg/RN -2.45 (VIOLATED)
u1/b3_reg/RN -2.45 (VIOLATED)
u2/b0_reg/RN -2.40 (VIOLATED)
u2/b1_reg/RN -2.40 (VIOLATED)
u2/b2_reg/RN -2.40 (VIOLATED)
u2/b3_reg/RN -2.40 (VIOLATED)
u2/b4_reg/RN -2.40 (VIOLATED)
u3/b2_reg/RN -2.38 (VIOLATED)
u3/b3_reg/RN -2.38 (VIOLATED)
u3/b4_reg/RN -2.38 (VIOLATED)
u3/b1_reg/RN -2.38 (VIOLATED)
u3/b0_reg/RN -2.38 (VIOLATED)
S1_reg[6]/RN -1.99 (VIOLATED)
A4_reg/D -1.99 (VIOLATED)
S1_reg[7]/RN -1.98 (VIOLATED)
A2_reg/D -1.98 (VIOLATED)
S2_reg[11]/RN -1.98 (VIOLATED)
S2_reg[12]/RN -1.98 (VIOLATED)
S2_reg[13]/RN -1.98 (VIOLATED)
S1_reg[11]/RN -1.98 (VIOLATED)
S1_reg[12]/RN -1.97 (VIOLATED)
S1_reg[13]/RN -1.97 (VIOLATED)
S3_reg[12]/RN -1.97 (VIOLATED
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Warning: Transition times on not annotated delay arcs havebeen set to zero. Cannot perform max_transition checking. (PTE-057)
max_capacitance
Required Actual
Pin Capacitance Capacitance Slack
-----------------------------------------------------------------
U100/Y 0.16 0.16 -0.01 (VIOLATED)
U112/Y 0.16 0.16 -0.01 (VIOLATED)
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发表于 2013-1-15 19:56:21
发表于 2013-1-15 23:00:41
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