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Signal descriptionSignal name
I/O data write strobe./DIOW
Used by the host to initiate a DMA transfer in response to DMARQ./DMACK
Strobe for Ultra DMA data transfers to host.DSTROBE
Ultra DMA data ready./HDMARDY
Strobe for Ultra DMA data transfers from host.HSTROBE
I/O ready; when driven low by the drive, signals the CPU to insert wait states into the I/O
read or write cycles.
IORDY
I/O channel select; not used on this computer./IOCS16
Asserted by the device when it is ready to transfer data to or from the host.DMARQ
Interrupt request. This active high signal is used to inform the computer that a data transfer
is requested or that a command has terminated.
INTRQ
Asserted by device 1 to indicate to device 0 that it has completed the power-on diagnostics;
not available on this computer (n.c.).
/PDIAG
Hardware reset to the drive; an active low signal./RESET
Stop request; an active low signal./STOP
This pin is the key for the connector.Key
The built-in ATA devices are connected to the I/O bus through bidirectional bus buffers.
SuperDrive (DVD-R /CD-RW)
The PowerBook G4 17-inch computer has a slot-loading DVD-R/CD-RW SuperDrive.
The SuperDrive can read and write DVD media and CD media, as shown in Table 3-8. The DVD-R/CD-RW drive
also provides DVD-Video playback. The G4 microprocessor provides the MPEG-2 decoding.
Table 3-8 Media read and written by the SuperDrive
Writing speedReading speed (maximum)Media type
1x (CLV)4x (CAV max)DVD-R
_8x (CAV max, single layer) 6x (CAV max, dual layer)DVD-ROM
8x (CLV)24x (CAV max)CD-R
4x (CLV)12x (CAV max)CD-RW
SuperDrive (DVD-R /CD-RW) 37
Legacy Document | 2003-03-01 | © 2003 Apple Computer, Inc. All Rights Reserved.
CHAPTER 3
Devices and Ports