AMD SEMPRON 10 - Manual (Page 85)

Chapter 10 Pin Descriptions 73
31994A —1 August 2004 AMD Sempron™ Processor Model 10 with 256K L2 Cache Data Sheet
PWROK Pin 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 39.
SADDIN[1:0]# and
SADDOUT[1:0]# Pins The AMD Sempron processor model 10 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.
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 69 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 13, “Thermal Diode Electrical Characteristics,” on
page 35 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.