Digi NS9750 User Manual
Page 55

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N S 9 7 5 0 P i n o u t
PCI/CardBus signals
Most of the CardBus signals are the same as the PCI signals. Other CardBus signals are
unique and multiplexed with PCI signals for the NS9750. Table 9 shows these unique
signals. Figure 8 illustrates how to terminate an unused PCI.
AD22
pci_int_d_n
2
N/A
I
PCI interrupt request D
AE26
pci_reset_n
3
N/A
I/O
PCI reset, output if internal central resource
enabled
AB24
pci_clk_in
U
N/A
I
PCI clock in. (Connected to pci_clk_out or an
externally generated PCI reference clock.)
AA23
pci_clk_out
N/A
O
PCI clock out
PCI signal
CardBus signal
CardBus type
Description
INTA#
CINT#
4
Input
CardBus interrupt pin. The
INTA2PCI
pin in the
PCI Miscellaneous Support register must be set
to 0.
INTB#
CCLKRUN#
4
Bidir
CardBus pin used to negotiate with the external
CardBus device before stopping the clock.
Allows external CardBus device to request that
the clock be restarted.
INTC#
CSTSCHG
5
Input
CardBus status change interrupt signal.
GNT1#
CGNT#
4
Output
Grant to external CardBus device from
NS9750’s internal arbiter.
Table 9: CardBus IO multiplexed signals
Pin #
Signal name
U/D
OD
(mA)
I/O
Description
Table 8: PCI interface pinout