4535 611 98931 iE33 Service Manual Page 99
CSIP Level 1 Theory of Operation: Bus Functions
Bus Functions
Platform
Subsystem
Buses
PCI Bus
The system platform PCI bus interface on the Host Motherboard provides access to the AVIO,
DSC, IPL, IEP, and the SIP Motherboards. It transfers signal path data transactions, transducer
tables, and other data. It also transfers RF data from the DSC to the Host, estimate data from
the DSC to the SIP, Native Format and Native Format Cineloop image data (scan-converted and
post-processed) from the SIP to the Host memory, and image import and export data from the
Host.
The PCI bus is a segmented bus, meaning that separate portions of the bus have different bus
speeds.
Universal Serial Bus (USB)
The Host Motherboard accesses the DVD drive, modem, user interface, VCR, and other digital
video OEMs through several USB buses. The USB connector on the back of the DVD drive and
the user USB port are USB 2.0 standard. All others are USB 1.1. The USB ports on the back of
the AVIO-RIP are not interchangeable. You must connect the OEMs to the specifically assigned
port for each OEM.
The Universal Serial Bus is powered by the system batteries when the system is off.
Inter-Platform Link Bus
Provides a PCI-PCI bridge that connects the Host Motherboard IPL module to the SIP Mother-
board IPL module. Connects each motherboard to a 66-MHz PCI bus segment.
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