February 2003
Intermediate to advanced
592 pages
11h 47m
English
Content preview from HyperTransport™ System Architecture
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Example 7:Fence Request
Problem: Device 3 (UnitID3) in Figure 7-9, issues a Fence request to provide a barrier between previous and subsequent posted writes; it applies to all I/O streams and virtual channels (except isochronous).
Figure 7-9. A Fence Request Issued By UnitID 3
Example 7: Fence RequestPacket Setup
(Refer to Figure 7-9 on page 179)
Command[5:0] Field (Byte 0, Bit 5:0)
This is the Fence request command code. There are no option bits within this field. For this example, field = 111100b.
SeqID[3:0] Field (Byte 0, Bit 7:6) and (Byte 1, Bit 6:5)
This field tags groups of requests that were issued as part of an ordered sequence. Fence ...
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