AMD Athlon 27493 - Manual (Page 18)

6 Interface Signals Chapter 2
AMD Athlon™ XP Processor Model 10 Data Sheet 26237C—May 2003
Preliminary Information
2.3 Push-Pull (PP) Drivers
The AMD Athlon XP processor model 10 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 78 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
23 and the AMD Athlon™ and AMD Duron™ System Bus
Specification, order# 21902.