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24309E—March 2002
SMI# Pin
STPCLK# Pin
SYSCLK and SYSCLK#
THERMDA and
THERMDC Pins
VCCA Pin
VID[4:0] Pins
Chapter 10
Preliminary Information
SMI# is an input that causes the processor to enter the system
management mode.
STPCLK# is an input that causes the processor to enter a lower
power mode and issue a Stop Grant special cycle.
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 68 for more
information.
Thermal Diode anode and cathode pins are used to monitor the
actual temperature of the processor die, providing more
accurate temperature control to the system.
See Table 14, "Thermal Diode Electrical Characteristics," on
page 39 for more information.
VCCA is the processor PLL supply. For information about the
VCCA pin, see Table 5, "VCCA AC and DC Characteristics," on
page 27 and the AMD Athlon™ Processor-Based Motherboard
Design Guide, order# 24363.
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.
For more information, see Table 22, "VID[4:0] Code to Voltage
Definition," on page 74.
Pin Descriptions
AMD Athlon™ XP Processor Model 6 Data Sheet
73
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