AMD AX2000DMT3C User Guide - Page 17
Interface Signals, 2.1 Overview, 2.2 Signaling Technology, Overview - specifications
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24309E-March 2002 Preliminary Information AMD Athlon™ XP Processor Model 6 Data Sheet 2 Interface Signals 2.1 Overview The AMD Athlon™ system bus architecture is designed to deliver excellent data movement bandwidth for nextgeneration x86 platforms as well as the high-performance required by enterprise-class application software. The system bus architecture consists of three high-speed channels (a unidirectional processor request channel, a unidirectional probe channel, and a 64-bit bidirectional data channel), source-synchronous clocking, and a packet-based protocol. In addition, the system bus supports several control, clock, and legacy signals. The interface signals use an impedance controlled push-pull, low-voltage, swing-signaling technology contained within the Socket A socket. For more information, see "AMD Athlon™ System Bus Signals" on page 6, Chapter 10, "Pin Descriptions" on page 51, and the AMD Athlon™ and AMD Duron™ System Bus Specification, order# 21902. 2.2 Signaling Technology The AMD Athlon system bus uses a low-voltage, swing-signaling technology, that has been enhanced to provide larger noise margins, reduced ringing, and variable voltage levels. The signals are push-pull and impedance compensated. The signal inputs use differential receivers that require a reference voltage (VREF). The reference signal is used by the receivers to determine if a signal is asserted or deasserted by the source. Termination resistors are not needed because the driver is impedance-matched to the motherboard and a high impedance reflection is used at the receiver to bring the signal past the input threshold. For more information about pins and signals, see Chapter 10, "Pin Descriptions" on page 51. Chapter 2 Interface Signals 5