Specifications

FireWire Controllers

The K2 IC includes a FireWire controller that supports both IEEE 1394b (FireWire 800) with a maximum data

rate of 800 Mbps (100 MBps) and IEEE 1394a (FireWire 400) with a maximum data rate of 400 Mbps (50 MBps).

The IC is backwards-compatible with 1394a (FireWire 400). The K2 IC provides DMA (direct memory access)

support for the FireWire interface.

The controller in the K2 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 ports.

For more information, see FireWire Ports (page 32).

Interrupt Support

The interrupt controller is an MPIC cell in the K2 IC. In addition to accepting internal interrupt sources from

the I/O, the MPIC controller accepts internal interrupts from U3H and dedicated interrupt pins.

USB Interface

The K2 IC has two independent USB OHCI controllers. The external USB interface is via the PCI USB controller;

see PCI USB Controller (page 24).

Serial ATA Interface

Based on the Serial ATA 1.0 specification, Serial ATA (SATA) is a disk-interface technology that delivers up to

1.5 Gbps of performance to each independent drive bus on the Power Mac G5 computer. It provides a scalable,

point-to-point connection that allows multiple ports to be aggregated into a single controller. Serial ATA uses

a thin, point-to-point cable connection that enables easy routing within a system, avoiding master/slave,

daisy-chaining, and termination issues and enabling better airflow within a system.

The K2 IC implements two Serial ATA revision one ports, each of which accommodates one independent

internal hard drive.

For information about the drive bays, see Hard Disk Drives (page 38).

Ultra DMA ATA/100 Interface

The K2 IC provides an Ultra DMA ATA/100 interface to support the optical drive. For information about specific

drives, see Disk Drives (page 38).

Architecture

K2 I/O Controller