Technical information

CHAPTER 4

Expansion Features

68 Expansion Bay

When a module is resinserted into the expansion bay, the triggering event is the

same:

7. When a module is reinserted, the /DEV_IN signal goes low. The Paddington

IC responds by generating an interrupt, but keeps external signals

deactivated, because the new device may be different from the one inserted

previously.

Figure 4-3 Timing of control signals during module insertion and removal

Guidelines for Developers 4

Each expansion bay module must be designed to prevent damage to itself and

to the computer when the user inserts or removes an expansion bay module

with the computer running.

The expansion bay connector is designed so that when the module is inserted

the ground and power pins make contact before the signal lines.

Even though you can design an expansion bay module that minimizes the

possibility of damage when it is inserted hot—that is, while the computer is

/DEV_IN

MB_DEV_ID(2-0)

/MB_PWR

Power plane

Enable

Media bay

control and data

/MB_RESET

5 6