Intel Pentium 4 Processor in the 478-pin Package / Intel 850 Chipset Platform Family Design Guide

AGP Interface Routing
R
120 Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide
The MCH G_PAR signal also needs an external pull-up resistor. This signal must have an external
pull-up resistor to ensure that G_PAR remains at a valid logic level during AGP protocol
transactions.
Table 27. AGP Pull-up/Pull-down Resistors
Signals PU/PD Requirement
1x Timing Domain
FRAME# pull-up resistor to VDDQ
TRDY# pull-up resistor to VDDQ
IRDY# pull-up resistor to VDDQ
DEVSEL# pull-up resistor to VDDQ
STOP# pull-up resistor to VDDQ
SERR# pull-up resistor to VDDQ
PERR# pull-up resistor to VDDQ
RBF# pull-up resistor to VDDQ
PIPE# pull-up resistor to VDDQ
REQ# pull-up resistor to VDDQ
GNT# Pull-up resistor to VDDQ
WBF# pull-up resistor to VDDQ
PAR# Pull-up resistor to VDDQ
INTA# pull-up resistor to 3.3 V
INTB# pull-up resistor to 3.3 V
2x/4x Timing Domain
AD_STB[1:0] pull-up resistor to VDDQ
SB_STB pull-up resistor to VDDQ
AD_STB[1:0]# pull-down resistor to GND
SB_STB# pull-down resistor to GND