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6 Interface Signals Chapter 2

AMD Duron™ Processor Data Sheet 23802E—September 2000

Preliminary Information

2.3 Push-Pull (PP) Drivers

The Socket A AMD Duron™ processor supports Push-Pull (PP)

drivers. The system logic configures the AMD Duron 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, VCC_Z, ZP, and VSS_Z Pins” on page

62 for more information.

2.4 AMD System Bus Signals

The AMD 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

■ 72-bit bidirectional data channel

For more information, see Chapter 6, “Electrical Data” on page

19 and the AMD System Bus Specification, order# 21902.

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AMD Duron Manuel d'utilisateur Page 18