Technical information

CHAPTER 4
Expansion Features
64 Expansion Bay
tables describe the three types of signals: Table 4-2 describes the audio and
control signals and Table 4-3 (page 64) describes the ATA signals.
Table 4-2 Audio and control signals on the expansion bay connector
Signal name Signal description
/DEVIN This signal should be low whenever a device is installed in
the expansion bay; it is used by the Paddington IC to
determine when a device has been inserted or removed.
The expansion bay module should connect this pin to
ground.
/IDE_RST Reset signal.
CD_SND_L Left-channel audio from a CD player in the bay (a line-level
analog signal).
CD_SND_R Right-channel audio from a CD player in the bay (a
line-level analog signal).
CD_SND_COM Audio common for CD sound signals.
Table 4-3 ATA signals on the expansion bay connector
Signal name Signal description
/CS1FX Register select signal. It is asserted low to select the main
task file registers. The task file registers indicate the
command, the sector address, and the sector count.
/CS3FX Register select signal. It is asserted low to select the
additional control and status registers on the IDE drive.
/DIOR I/O data read strobe.
/DIOW I/O data write strobe.
DMARQ DMA request signal.
/DMACK DMA acknowledge signal.