February 2003
Intermediate to advanced
592 pages
11h 47m
English
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Introduction: Three Types Of Traffic Flow
Hypertransport defines three types of traffic: Programmed I/O (PIO), Direct Memory Access (DMA), and Peer-to-Peer. Figure 6-1 on page 121 depicts the three types of traffic.
Programmed I/O traffic originates at the host bridge on behalf of the CPU and targets I/O or Memory Mapped I/O in one of the peripherals. These types of transactions often are generated by CPU to set up peripherals for bus master activity, check status, program configuration space, etc.
DMA traffic originates at a bus master peripheral and typically targets main memory. This traffic is used so that the CPU may be off-loaded from the burden of moving large amounts of data to and from the I/O subsystem. Generally, the CPU uses a few ...
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