Intel Pentium 4 Processor in the 478-PinPackage at 1.40 GHz, 1.50 GHz, 1.60 GHz, 1.70 GHz, 1.80 GHz, 1.90 GHz, and 2GHz

System Bus Signal Quality Specifications
40 Datasheet
Figure 18. High-to-Low System Bus Receiver Ringback Tolerance
Figure 19. Low-to-High System Bus Receiver Ringback Tolerance for PWRGOOD and TAP
Buffers
V
CC
Noise Margin
V
SS
GTLREF
+100 mV
-100 mV
0.5 * Vcc
Vt+ (min)
Vt+ (max)
Vt- (max)
Vcc
Allowable Ringback
Vss
ThresholdRegiontoswitch
receivertoalogic1.