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6 Interface Signals Chapter 2
AMD Sempron™ Processor Model 10 with 256K L2 Cache Data Sheet 31994A —1 August 2004
2.3 Push-Pull (PP) Drivers
The AMD Sempron 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 75 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 6, “333 FSB
AMD Sempron™ Processor Model 10 with 256K L2 Cache
Specifications” on page 21, Chapter 7, “Electrical Data” on
page 25, and the AMD Athlon™ and AMD Duron™ System Bus
Specification, order# 21902.