AMD 27488 SADDIN10#, SADDOUT10# Pins, Scan Pins, SMI# Pin, STPCLK# Pin, Thermda, Thermdc Pins

Preliminary Information

26237C —May 2003 AMD Athlon™ XP Processor Model 10 Data Sheet

SADDIN[1:0]# and	The AMD Athlon XP processor model 10 does not support
SADDOUT[1:0]# Pins	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,
	see the AMD Athlon™ and AMD Duron™ System Bus
	Specification, order# 21902.
Scan Pins	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.
SMI# Pin	SMI# is an input that causes the processor to enter the system
	management mode.
STPCLK# Pin	STPCLK# is an input that causes the processor to enter a lower
	power mode and issue a Stop Grant special cycle.
SYSCLK and SYSCLK#	SYSCLK and SYSCLK# are differential input clock signals
	provided to the PLL of the processor from a system-clock
	generator.
	See “CLKIN, RSTCLK (SYSCLK) Pins” on page 73 for more
	information.
THERMDA and	Thermal Diode anode and cathode pins are used to monitor the
THERMDC Pins	actual temperature of the processor die, providing more
	accurate temperature control to the system.
	See Table 13, “Thermal Diode Electrical Characteristics,” on
	page 37 for more information.
VCCA Pin	VCCA is the processor PLL supply. For information about the
	VCCA pin, see Table 5, “VCCA AC and DC Characteristics,” on
	page 35 and the AMD Athlon™ Processor-Based Motherboard
	Design Guide, order# 24363.
	To prevent damage to the processor, do not pull this signal High
	above 2.5 V. Do not expose this pin to a differential voltage
	greater than 1.60 V, relative to the processor core voltage.
VID[4:0] Pins	The VID[4:0] (Voltage Identification) outputs are used to
	dictate the VCC_CORE voltage level. The VID[4:0] pins are
	strapped to ground or left unconnected on the processor
	package. The VID[4:0] pins are pulled up on the motherboard
	and used by the VCC_CORE DC/DC converter.

Chapter 11 Pin Descriptions 77