Datasheet

3–9

Table 3–3. Configuration via MS0 and MS1

MS0

MS1 MODE

0 0 CompactPCI hot-swap friendly

PCI Bus Power Management Interface Specification Revision 1.1

HSSWITCH/GPIO(3) functions as HSSWITCH

0 1 CompactPCI hot-swap disabled

PCI Bus Power Management Interface Specification Revision 1.1

HSSWITCH/GPIO(3) functions as GPIO(3)

1 X Intel compatible

No cPCI hot swap

PCI Bus Power Management Interface Specification Revision 1.0

3.14 CompactPCI Hot-Swap Support

The PCI2050 is hot-swap friendly silicon that supports all of the hot-swap capable features, contains support for

software control, and integrates circuitry required by the PICMG CompactPCI Hot-Swap Specification. To be

hot-swap capable, the PCI2050 supports the following:

• Compliance with PCI Local Bus Specification

• Tolerance of V

from early power

• Asynchronous reset

• Tolerance of precharge voltage

• I/O buffers that meet modified V/I requirements

• Limited I/O terminal voltage at precharge voltage

• Hot-swap control and status programming via extended PCI capabilities linked list

• Hot-swap terminals: HS_ENUM

, HS_SWITCH, and HS_LED

cPCI hot-swap defines a process for installing and removing PCI boards without adversely affecting a running system.

The PCI2050 provides this functionality such that it can be implemented on a board that can be removed and inserted

in a hot-swap system.

The PCI2050 provides three terminals to support hot-swap when configured to be in hot-swap mode: HS_ENUM

(output), HS_SWITCH (input), and HS_LED (output). The HS_ENUM output indicates to the system that an insertion

event occurred or that a removal event is about to occur. The HS_SWITCH

input indicates the state of a board ejector

handle, and the HS_LED output lights a blue LED to signal insertion- and removal-ready status.