February 2003
Intermediate to advanced
592 pages
11h 47m
English
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The High Speed Signals (One Set In Each Direction)
Each high-speed signal is actually a differential signal pair. CAD (Command/Address/Data) information consists of the two basic types of HyperTransport packets: control and data. When a link transmitter sends packets on the CAD bus, the receive side of the interface uses the CLK and CTL signals, also supplied by the transmitter, to latch in packet information during each bit time. CTL distinguishes control packets from data packets.
The CAD Signal Group
The CAD bus is always driven by the transmitter side of a link, and is comprised of signal pairs that carry HyperTransport requests, responses, and data. Each CAD bus may consist of between 2 bits (two differential signal pairs) and 32 bits (thirty-two ...
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