Intel 21555 User Manual page 196

Acronyms
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MFAs – Message Frame Addresses
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MPEG – Moving Pictures Experts Group
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MV – Motion vector
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MVC – Part Control Number
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MWI – Memory Write and Invalidate
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OBMC – Overlapped block motion compensation
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OS – Operating system
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PPB – PCI-to-PCI bridge
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PQFP – Plastic Quad Flat Package
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quiesced – The PCI card is no longer performing or scheduling transactions.
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RAM – Read only memory
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ROM – Random access memory
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SA – StrongARM or StrongARM Architecture
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SAC – Single Address Cycle
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S fs – Saturated fixed scale
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TAP – (JTAG) Test Access Port
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Vdd _vio or V/IO – (S)scondary or (P)rimary_Voltage Input or Output. In PCI specifications it is defined as V/
IO
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VGA – Video Graphics Adapter
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VLD – Variable length decoding
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Vss – Voltage for Substrate & Sources, usually ground potential.
206 21555 Non-Transparent PCI-to-PCI Bridge User Manual