From: [email protected]
Date: Fri Feb 09 2001 - 10:18:44 PST
This question is related to the load conditions used to
TIME-TO-VM correction factor for the Mobile Pentium III
the 82443BX chipset.
I understand that the load conditions mentioned in the
determine the TIME-TO VM correction should be the same
mentioned in the datasheets for a particular component.
The GTL model for the 82443BX has the following load
TIME_TO_VM: 1.22 0.31 # C=0 pF, R=25 Ohms, V=1.5 V,
This is the same load conditions as mentioned in the
The GTL model for Mobile P III with 50 ohm on-die
MODEL) has the following load conditions in the model
TIME_TO_VM: 0.36 0.29 # C=0 pF,R=1e+007 Ohms,V=0V
As per the datsheets in Mobile PentiumŪ III Processor
in BGA2 and
Micro-PGA2 Packages at 400 MHz, 450 MHz, and 500 MHz
Table 15. GTL+ Signal Groups AC Specifications
RTT = 56W internally terminated to VCCT; VREF =2/3VCCT;
load = 0 pF;
AS per the 82443BX Host Bridge/Controller - Timing
Mobile delays are specified into a 56 ohm resistor
which is tied to VTT=1.5V
Why has the Time to Vm calculated with R=10 Megaohms
tied to V=0V in the model?
Why has such a high value of resistor being used?
Shall i calculate the Time to Vm specified in the
that is with R=56ohms tied to V=1.5V, C=0pF, and
Looking forward to your replies and suggestions.
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