Design Center


- 14


 

WHEN . MESSAGE.

. SETUP_HOLD, WIDTH, FREQ, GENERAL CONSTRAINT . , . WHEN, , < > . GENERAL WHEN . . MESSAGE.

ERRORLIMIT, . DIGERRDEFAULT (. .OPTIONS), 20. , , . , , PSpice .out.

DIGERRLIMIT (. .OPTIONS), . DIGERRLIMIT .

CONSTRAINT 74LS160A, :

 

ULS160ACON CONSTRAINT (10) DRR DGND

+ CLK ENP ENT CLBAR LOADBAR A B C D EN

+ IO_LS

+ FREQ:

+ NODE = CLK

+ MAXFREQ = 25MEG

+ WIDTH:

+ NODE = CLK

+ MIN_LO = 25NS

+ MIN_HI = 25NS

+ WIDTH:

+ NODE = CLRBAR

+ MIN_LO = 20NS

+ SETUP_HOLD:

+ DATA(1) = LOADBAR

+ CLOCK LH = CLK

+ SETUPTIME = 20NS

+ HOLDTIME = 3NS

+ WHEN = { CLRBAR!='0 }

+ SETUP_HOLD:

+ DATA(2) = ENP ENT

+ CLOCK LH = CLK

+ SETUPTIME = 20NS

+ HOLDTIME = 3NS

+ WHEN = { CLRBAR!= '0 & (LOADBAR!= '0 ^ CHANGED (LOADBAR,0))

+ & CHANGED(EN,20NS) }

+ SETUP_HOLD:

+ DATA(4) = A B C D

+ CLOCK LH = CLK

+ SETUPTIME = 20NS

+ HOLDTIME = 3NS

+ WHEN = { CLRBAR!= '0 & (LOADBAR!='1 ^ CHANGED(LOADBAR,0)) }

+ SETUP_HOLD:

+ DATA(1) = CLRBAR

+ CLOCK LH = CLK

+ RELEASETIME_LH = 25NS

 

 




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