AMD AX2000DMT3C User Guide - Page 85

SMI# Pin, STPCLK# Pin, SYSCLK and SYSCLK#, THERMDA and THERMDC Pins, VCCA Pin, VID[4:0] Pins

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24309E-March 2002 Preliminary Information AMD Athlon™ XP Processor Model 6 Data Sheet SMI# Pin STPCLK# Pin SYSCLK and SYSCLK# THERMDA and THERMDC Pins VCCA Pin VID[4:0] Pins 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. Chapter 10 Pin Descriptions 73

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Chapter 10
Pin Descriptions
73
24309E—March 2002
AMD Athlon™ XP Processor Model 6 Data Sheet
Preliminary Information
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 68 for more
information.
THERMDA and
THERMDC Pins
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 Pin
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.
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.
For more information, see Table 22, “VID[4:0] Code to Voltage
Definition,” on page 74.