Nc Pins; Nmi Pin; Pga Orientation Pins; Pll Bypass And Test Pins - AMD AX1800DMT3C - Athlon XP 1.53 GHz Processor Datasheet

AMD Athlon™ XP Processor Model 6 Data Sheet

NC Pins

NMI Pin

PGA Orientation Pins

PLL Bypass and Test
Pins

PWROK Pin

SADDIN[1:0]# and
SADDOUT[1:0]# Pins

Scan Pins

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Preliminary Information
See "NC Pins" for more information.
The motherboard should provide a plated hole for an NC pin.
The pin hole should not be electrically connected to anything.
NMI is an input from the system that causes a non-maskable
interrupt.
No pin is present at pin locations A1 and AN1. Motherboard
designers should not allow for a PGA socket pin at these
locations.
For more information, see the AMD Athlon™ Processor-Based
Motherboard Design Guide, order# 24363.
P L LT E S T # , P L L B Y PA S S # , P L L M O N 1 , P L L M O N 2 ,
PLLBYPASSCLK, and PLLBYPASSCLK# are the PLL bypass
and test interface. This interface is tied disabled on the
motherboard. All six pin signals are routed to the debug
connector. All four processor inputs (PLLTEST#, PLLBYPASS#,
PLLMON1, and PLLMON2) are tied to VCC_CORE with pullup
resistors.
The PWROK input to the processor must not be asserted until
all voltage planes in the system are within specification and all
system clocks are running within specification.
For more information, Chapter 8, "Signal and Power-Up
Requirements" on page 43.
The AMD Athlon XP processor model 6 does not support
SADDIN[1:0]# or SADDOUT[1:0]#. SADDIN[1]# is tied to VCC
with pullup resistors, if this bit is not supported by the
Northbridge (future models can support SADDIN[1]#).
SADDOUT[1:0]# are tied to VCC with pullup resistors if these
pins are supported by the Northbridge. For more information,
s e e t h e A M D A t h l o n ™ a n d A M D D u r o n ™ S y s t e m B u s
Specification, order# 21902.
SCANSHIFTEN, SCANCLK1, SCANINTEVAL, and SCANCLK2
are the scan interface. This interface is AMD internal and is
tied disabled with pulldown resistors to ground on the
motherboard.
Pin Descriptions
24309E—March 2002
Chapter 10