Справочник Пользователя для AMD sempron 10

31994A —1 August  2004

signals High above 2.5 V. Do not expose these pins to a 
differential voltage greater than 1.60 V, relative to the 
processor core voltage.

Refer to “VCC_2.5V Generation Circuit” found in the section, 
“Motherboard Required Circuits,” of the AMD Athlon™ 
Processor Motherboard Design Guide, order# 24363 for the 
required supporting circuitry.

See “Frequency Identification (FID[3:0])” on page 27 for the 
DC characteristics for FID[3:0].

FSB_Sense[1:0] pins are either open circuit (logic level of 1) or 
are pulled to ground (logic level of 0) on the processor package 
with a 1 k

Ω resistor. In conjunction with a circuit on the 

motherboard, these pins may be used to automatically detect 
the front-side bus (FSB) setting of this processor. Proper 
detection of the FSB setting requires the implementation of a 
pull-up resistor on the motherboard. Refer to the AMD Athlon™ 
Processor-Based Motherboard Design Guide, order# 24363 and the 
technical note FSB_Sense Auto Detection Circuitry for Desktop 
Processors, order# TN26673 for more information.

Table 22 is the truth table to determine the FSB of desktop 
processors. 

The FSB_Sense[1:0] pins are 3.3-V tolerant.

FLUSH# must be tied to V

CC_CORE

 with a pullup resistor. If a 

debug connector is implemented, FLUSH# is routed to the 
debug connector.

IGNNE# is an input from the system that tells the processor to 
ignore numeric errors.

INIT# is an input from the system that resets the integer 
registers without affecting the floating-point registers or the 
internal caches. Execution starts at 0_FFFF_FFF0h.

1

0

 RESERVED

1

1

133 MHz

0

1

166 MHz

0

0

200 MHz