February 2003
Intermediate to advanced
592 pages
11h 47m
English
Content preview from HyperTransport™ System Architecture
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The Need To Interleave Control And Data Packets
An important feature of HyperTransport packet management is that a transmitter may interleave control packets with data packets associated with earlier requests. Interleaving control packets with data helps mitigate “stalls” in sending new control packets on the multiplexed CAD bus when large data transfers are in progress. An example of such as stall is as follows:
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A transmitter starts a Sized Dword Write of 64 bytes (16 dwords) on a 2-bit HyperTransport link interface.
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After the write transaction commences, the transmitter realizes it needs to send a read request or NOP information packet over the bus.
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3. | Without the ability to interleave control packets, the transmitter would have to ... |
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