Footnotes

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Now at DEC Systems Research Center.
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This work was supported by a grant from the Science and Engineering Research Council.
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One good reason for the small size is to maintain reasonable bandwidth efficiency.
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Even without any QoS considerations, at least routing context is required.
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This size is known as CIF, Common Intermediate Format
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The Audio/DSP node was implemented by Ian Atkinson as a final year undergraduate project.
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Most of our sources of video are interlaced at 2 fields per frame.
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This used the local ATM protocol, which defines an echo service through which a single cell message was passed.
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This time is due to switching between the interconnect clock and the CPU clock and is estimated as 100-200ns.
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Pre-fetching reduces this to 320ns for the second 32 bytes of a 64 byte aligned block.
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Buffering in the memory control ASIC makes this value hard to determine.
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These experiments are fully reported in [\bf\protect\citenameHayter93]

Paul Barham and Mark Hayter