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System RAM
Thememory subsystem in the PowerBook G417-inch computer supports two slots for 333 MHz DDR (PC2700)
SO-DIMMs (small-outline dual inline memory modules). The data bus to the RAM and DIMM is 64 bits wide,
and the memory interface is synchronized to the MaxBus bus interface at 167 MHz. See “RAM Expansion
Slots” (page 53).
Boot ROM
The boot ROM is connected to the Intrepid IC by way of the high byte of the PCI bus plus three additional
control signals: chip select, write enable, and output enable. The boot ROM is a 1 MB by 8 bit device.
FireWire Controllers
The Intrepid IC FireWire controller supports IEEE 1394a for a maximum data rate of 400 Mbps (50 MBps) and
IEEE 1394b for a maximum data rate of 800 Mbps (100 MBps). The Intrepid IC provides DMA (direct memory
access) support for the FireWire interface.
The controller in the Intrepid IC implements the FireWire link layer. A physical layer IC, called a PHY, implements
the electrical signaling protocol of the FireWire interface and provides the electrical signals to the port. For
more information, see “FireWire 400 Connector” (page 26) and “FireWire 800 Connector” (page 27).
Ethernet Controller
The Intrepid IC includes an Ethernet media access controller (MAC) that implements the linklayer. The Intrepid
IC provides DB-DMA support for the Ethernet interface.
The Ethernet controller in the Intrepid IC is connected to a PHY interface ICthat provides theelectrical signals
to the port. The PHY is capable of operating in either 10Base-T, 100Base-T, or 1000Base-T mode: The actual
speed of the link is automatically negotiated by the PHY and the bridge or router to which it is connected.
For more information, see “Ethernet Port” (page 29).
The PHY supports Auto-MDIX, which allows the use of straight-through cables in crossover situations (and
conversely). For more information, see “Ethernet Port” (page 29).
Video Display Subsystem
The video display subsystem contains the graphics controller IC along with 64 MB of DDR SDRAM memory.
The graphics IC,an nVidia GeForce4 440 Go, contains 2Dand 3D acceleration engines, front-end and back-end
scalers, a CRT controller, and an AGP4x bus interface with bus master capability.
The features of the nVidia GeForce4 440 Go include
● graphics processor clock speed of 189 MHz
● memory clock speed of 202.5 MHz
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Intrepid Controller and Buses
Legacy Document | 2003-03-01 | © 2003 Apple Computer, Inc. All Rights Reserved.
CHAPTER 2
Architecture