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24309E—March 2002
CONNECT Pin
COREFB and
COREFB# Pins
CPU_PRESENCE# Pin
DBRDY and DBREQ#
Pins
FERR Pin
Chapter 10
Preliminary Information
See "SYSCLK and SYSCLK#" on page 73 for more information.
CONNECT is an input from the system used for power
management and clock-forward initialization at reset.
COREFB and COREFB# are outputs to the system that provide
processor core voltage feedback to the system.
CPU_PRESENCE# is connected to VSS on the processor
package. If pulled-up on the motherboard, CPU_PRESENCE#
may be used to detect the presence or absence of a processor in
the Socket A-style socket.
DBRDY and DBREQ# are routed to the debug connector.
DBREQ# is tied to VCC_CORE with a pullup resistor.
FERR is an output to the system that is asserted for any
unmasked numerical exception independent of the NE bit in
CR0. FERR is a push-pull active High signal that must be
inverted and level shifted to an active Low signal. For more
information about FERR and FERR#, see the "Required
Circuits" chapter of the AMD Athlon™ Processor-Based
Motherboard Design Guide, order# 24363.
Pin Descriptions
AMD Athlon™ XP Processor Model 6 Data Sheet
69
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