Configuring Ns9750 For Cardbus Support - Digi NS9750 Hardware Reference Manual

Notes:
The power controller is required only for applications that support hot-insertion
1
and hot-removal of the CardBus card. This requires additional components to
isolate NS9750 from CardBus.
The system must provide external pullup per PCI specification. CAD, C/BE, and
2
PAR do not require pullups.
Voltage detection signal optional for embedded system.
3
Pins not connected because internal resistors tie these to the appropriate state.
4

Configuring NS9750 for CardBus support

Although many CardBus signals are the same as those for the PCI bus, there are some
unique signals. Table 285 lists the new signals and indicates the PCI signals with which
they are multiplexed for NS9750.
PCI Signal
INTA#
INTB#
INTC#
GNT1#
GNT2#
GNT3#
REQ1#
Table 285: CardBus IO muxing
CardBus
Signal CardBus type
CINT# Input
CCLKRUN# Bidir
CSTSCHG Input
CGNT# Output
CVS1 Output
CVS2 Output
CREQ# Input
P C I - t o - A H B B r i d g e
Comments
Cardbus interrupt pin. INTA2PCI in the PCI
Miscellaneous Support register must be 0.
CardBus pin used to negotiate with the external
CardBus device before stopping the clock. Also
allows external CardBus device to request that the
clock be restarted.
CardBus status change interrupt signal.
Grant to external CardBus device from NS9750's
internal arbiter.
Voltage sense pin. Normally driven low by NS9750,
but toggled during interrogation of external CardBus
device to detect voltage requirements.
Voltage sense pin. Normally driven low by NS9750
but toggled during interrogation of external CardBus
device to detect voltage requirements.
Request from external CardBus device to NS9750's
internal arbiter.
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