Technical information

CHAPTER 2
Architecture
26 Main Logic Board
The Paddington IC is also used in the iMac computer and is similar to the
Heathrow IC used in the Power Macintosh G3 computers and Macintosh
PowerBook G3 computers. The main difference is that the Paddington IC
supports 100Base-TX Ethernet as well as 10Base-T.
ZiVA PC DVD Decoder 2
Some configurations have a built-in DVD decoder IC: a ZiVA-PC made by
C-Cube Microsystems. The IC provides video support for a DVD drive in the
expansion bay.
In addition to the video timing generation and DVD system functions, the
ZiVA-PC IC provides the following decoding functions:
■ Linear PCM audio decoding
■ MPEG-2 audio and video decoding.
■ AC-3 decoding and downmixing from 5.1 to 2 audio channels
The ZiVA-PC IC controls 2 MB of synchronous DRAM, enabling the IC to
provide full NTSC and PAL video decoding.
Ethernet PHYTER IC 2
The Ethernet interface IC is a DP83843 PHYTER made by National
Semiconductor. The PHYTER IC contains both the physical layer and the
transceiver and filter circuits. The IC provides a dual-speed Ethernet controller,
supporting both 10Base-T and 100Base-TX protocols.
USB Controller IC 2
The USB controller is a standard IC (USB0763) that supports two USB
connectors. The IC’s register set complies with the Open Host Controller
Interface (OHCI) specification.
Video Display Subsystem 2
The display subsystem consists of a graphics controller IC, 8 MB of SDRAM on
the main logic board, and ports for external video monitors.