AMD AX2000DMT3C User Guide - Page 58
Clock Multiplier Selection (FID[3:0]), 8.2 Processor Warm Reset Requirements, Northbridge Reset Pins
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Preliminary Information AMD Athlon™ XP Processor Model 6 Data Sheet 24309E-March 2002 Clock Multiplier Selection (FID[3:0]) The chipset samples the FID[3:0] signals in a chipset-specific manner from the processor and uses this information to determine the correct Serial Initialization Packet (SIP). The chipset then sends the SIP information to the processor for configuration of the AMD Athlon system bus for the clock multiplier that determines the processor frequency indicated by the FID[3:0] code. The SIP is sent to the processor using the SIP protocol. This protocol uses the PROCRDY, CONNECT, and CLKFWDRST signals, that are synchronous to SYSCLK. For more information about FID[3:0], see "FID[3:0] Pins" on page 70. Serial Initialization Packet (SIP) Protocol. Refer to AMD Athlon™ and AMD Duron™ System Bus Specification, order# 21902 for details of the SIP protocol. 8.2 Processor Warm Reset Requirements Northbridge Reset Pins RESET# cannot be asserted to the processor without also being asserted to the Northbridge. RESET# to the Northbridge is the same as PCI RESET#. The minimum assertion for PCI RESET# is one millisecond. Southbridges enforce a minimum assertion of RESET# for the processor, Northbridge, and PCI of 1.5 to 2.0 milliseconds. 46 Signal and Power-Up Requirements Chapter 8