LSI LSIFC929 Technical Manual page 51

Table 4.1 PCI Interface (Cont.)
Signal I/O
ENUM/ B
64EN/ B
SWITCH I
HOTSWAPEN/ I
GPIO[2] B
(BLUELED/)
BGA Pad
Number Pad Type Description
AC13 5 V Tol
BiDir PCI
AC14 5 V Tol
BiDir PCI
A1 5 V Tol In Insertion/Deassertion Indicator. This signal is
M3 5 V Tol In Hot Swap Enable. When this signal is LOW,
C5 3.3 V
BiDir
8 mA
w/pullup
Copyright © 2000, 2001 by LSI Logic Corporation. All rights reserved.
ENUM/. This signal must be asserted by a hot
swap capable card immediately after insertion
and during removal. This signal notifies the
system host either that a board has been
freshly inserted or that one is about to be
extracted, and informs the system host that the
configuration of the system has changed. The
system host then can perform any necessary
maintenance such as installing a device driver
upon board insertion, or quiescing a device
driver and the board, prior to the board's
extraction.
PCI Bus Width Enable. This signal indicates
the width of the bus when hot swap capability
is enabled.
an input to the LSIFC929 to signal the insertion
or impending extraction of a board. This signal
causes the assertion of ENUM/. The operator
normally activates the switch (actuator), waits
for the illumination of the LED, and then
extracts the board.
the LSIFC929 is configured to comform to hot
swap protocol. This includes changing the bus
width detection method, the addition of
configuration registers, and support for the
ENUM/, BLUELED/ and SWITCH pins.
GPIO[2] (BLUELED/). This signal will drive a
blue LED that is mounted on the front of hot
swap capable host adapters. This signal
indicates that the system software has been
placed in a state for orderly extraction of the
board. See also the description of the GPIO[2]
pin in Table 4.5, page 4-14, for additional
information regarding other operational
capabilities of this signal.
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