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6 Interface Signals Chapter 2
AMD Athlon™ XP Processor Model 8 Data Sheet 25175H—March 2003
Preliminary Information
2.3 Push-Pull (PP) Drivers
The AMD Athlon XP processor model 8 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 80 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 8, “Electrical Data” on page
31 and the AMD Athlon™ System Bus Specification, order#
21902.