User Manual

Table Of Contents
System Bus Signal Quality Specifications
Mobile Intel
Pentium
4 Processor-M Datasheet 53
Table 29. Ringback Specifications for PWRGOOD Input and TAP Signal Groups
NOTES:
1. All signal integrity specifications are measured at the processor silicon.
2. Unless otherwise noted, all specifications in this table apply to all Mobile Intel Pentium 4 Processor-M
frequencies.
3. Please see Section 3.3 for maximum allowable overshoot.
4. Please see Section 2.11 for the DC specifications.
Signal Group Transition
Maximum Ringback
(with Input Diodes Present)
Unit Figure
Notes
TAP and PWRGOOD 0 1 Vt+(max) TO Vt-(max) V 28 1,2,3,4
TAP and PWRGOOD 1 0 Vt-(min) TO Vt+(min) V 29 1,2,3,4
Figure 26. Low-to-High System Bus Receiver Ringback Tolerance
GTLREF
V
CC
Noise
Margin
+10% GTLREF
-10% GTLREF
V
SS
Figure 27. High-to-Low System Bus Receiver Ringback Tolerance
V
CC
N
oise
Margin
V
SS
GTLREF
+10% GTLREF
-10% GTLREF