Technical information

CHAPTER 4
Expansion Features
66 Expansion Bay
Unused IDE Signals on the Expansion Bay Connector 4
Several signals defined in the standard interface for the IDE drive are not used
by the expansion bay. Those signals are listed in Table 4-4 along with any action
required for the device to operate in the expansion bay.
Power on the Expansion Bay Connector 4
Table 4-5 describes the power lines on the expansion bay connector. The +5V
line is controlled by the /MB_PWR signal from the Paddington IC.
The power lines are equipped with current-limiting devices to protect the
computer from damaged modules or short circuits. The current limit is between
1.8 and 2.0 A.
IMPORTANT
For thermal reasons, the continuous power dissipation in
the expansion bay must not exceed a total of 5 W. ▲
Table 4-4 Unused IDE signals on the expansion bay connector
Signal name Comment
CSEL This signal must be tied to ground to configure the device as
the master in the default mode.
PDIAG No action required; the device is never operated in
master-slave mode.
DAS No action required.
Table 4-5 Power lines on the expansion bay connector
Signal name Signal description
GND Ground.
+5V 5 V power; maximum total current is 1.0 A.