AMD AX2000DMT3C User Guide - Page 81
CONNECT Pin, COREFB and COREFB# Pins, CPU_PRESENCE# Pin, DBRDY and DBREQ# Pins, FERR Pin
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24309E-March 2002 Preliminary Information AMD Athlon™ XP Processor Model 6 Data Sheet CONNECT Pin COREFB and COREFB# Pins CPU_PRESENCE# Pin DBRDY and DBREQ# Pins FERR Pin 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. Chapter 10 Pin Descriptions 69