RE: [IBIS-Users] Regarding the Understanding of Vinl+/- & Vinh+/- sub-params

Hi Vipul,
I will try to explain with an example

Say, I/O supply (DVDD) is 3.3V
Rising   Vth+     Vinl+ = 1.2  Vinh+ = 2.0
Falling  Vth-     Vinl- = 0.8  Vinh+ = 1.6

Now - simulator will have three level =   0(low)  0.5(ambiguous) 1(high)

While rising 0 - > 3.3v
              0           - 1.2(vinl+)   =>  0
              1.2(Vinl+)  - 2.0 (Vinh+)  =>  0.5 (ambiguous)
              2.0(Vinh+)  and above      =>  1 

While falling  3.3V -> 0
               3.3V            - 1.6V (Vinh+)  => 1
               1.6V(Vinh+)     -  0.8V (Vinl-) => 0.5 (ambiguous)
               0.8V          and below         => 0   


This promises that say a signal has switched low-to-high ie.., crossed
(2.0), it will remain in high state even if signal oscillate or find a
kink( 0 - 2.0V - 1.65V - 3.3V), but not below 1.6V. 

For more information please refer to, 
http://www.vhdl.org/pub/ibis/birds/bird39.txt
 

Thanks,
Muniswar 


-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Vipul Pursottam PATEL
Sent: Thursday, September 04, 2008 1:52 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] Regarding the Understanding of Vinl+/- & Vinh+/-
sub-params

Hello Experts,
	
	I have a query regarding the explaination given for "Vinh+/-" &
"Vinl+/-" sub-params of [Model Spec] Keyword given in IBIS
specifications. According to IBIS specifications, "Vinh+/-" & "Vinl+/-"
can be used to Model the Rising Edge Switching region and Falling Edge
Switching regions respectively for recievers with hysteresis. These
sub-params specifies the regions where the thresholds for low-to-high &
high-to-low transitions should appear.
	
	I am not able to understand how the Simulation tools (should)
interpret/use this information while simulating for a rising or falling
input (to a reciever with hyst.), for a particular Voltage & process.
Which keyword specifies the high-to-low and low-to-high transition
thresholds in case of reciever with Hysteresis? Also, how the transition
at the recievers output look like, should it be a abrupt level switching
on threshold crossing or something else?

Regards,
Vipul


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