AMD AX2000DMT3C User Guide - Page 18

Push-Pull (PP) Drivers, 2.4 AMD Athlon™ System Bus Signals, Interface Signals,

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Preliminary Information AMD Athlon™ XP Processor Model 6 Data Sheet 24309E-March 2002 2.3 Push-Pull (PP) Drivers The AMD Athlon XP processor model 6 supports Push-Pull (PP) drivers. The system logic configures the processor with the configuration parameter called SysPushPull (1=PP). The impedance of the PP drivers is set to match the impedance of the motherboard by two external resistors connected to the ZN and ZP pins. See "ZN and ZP Pins" on page 74 for more information. 2.4 AMD Athlon™ System Bus Signals The AMD Athlon system bus is a clock-forwarded, point-topoint interface with the following three point-to-point channels: ■ A 13-bit unidirectional output address/command channel ■ A 13-bit unidirectional input address/command channel ■ A 72-bit bidirectional data channel For more information, see Chapter 7, "Electrical Data" on page 25 and the AMD Athlon™ and AMD Duron™ System Bus Specification, order# 21902. 6 Interface Signals Chapter 2

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6
Interface Signals
Chapter 2
AMD Athlon™ XP Processor Model 6 Data Sheet
24309E—March 2002
Preliminary Information
2.3
Push-Pull (PP) Drivers
The AMD Athlon XP processor model 6 supports Push-Pull (PP)
drivers. The system logic configures the processor with the
configuration parameter called SysPushPull (1=PP). The
impedance of the PP drivers is set to match the impedance of
the motherboard by two external resistors connected to the ZN
and ZP pins.
See “ZN and ZP Pins” on page 74 for more information.
2.4
AMD Athlon™ System Bus Signals
The AMD Athlon system bus is a clock-forwarded, point-to-
point interface with the following three point-to-point channels:
■
A 13-bit unidirectional output address/command channel
■
A 13-bit unidirectional input address/command channel
■
A 72-bit bidirectional data channel
For more information, see Chapter 7, “Electrical Data” on page
25 and the
AMD Athlon™ and AMD Duron™ System Bus
Specification
, order# 21902.