Digi NS9750 User Manual
Page 54
P i n o u t a n d s i g n a l d e s c r i p t i o n s
3 0
N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Y25
idsel
3, 4
N/A
I
Initialization device select:
For PCI host applications, connect to
AD11.
For PCI device applications, connection
is determined by the PCI device number
assigned to the NS9750.
For CardBus applications, connect to the
external pullup resistor.
Do not allow input to float in any
application.
T24
irdy_n
2
N/A
I/O
Initiator ready
P24
par
1
N/A
I/O
Parity signal
R25
perr_n
2
N/A
I/O
Parity error
R26
serr_n
2
N/A
I/O
System error
Input:
pci_central_resource_n = 0
Output:
pci_central_resource_n = 1
R24
stop_n
2
N/A
I/O
Stop signal
T25
trdy_n
2
N/A
I/O
Target ready
AC24
pci_arb_gnt_1_n
6
N/A
O
PCI channel 1 grant
AD23
pci_arb_gnt_2_n
6
N/A
O
PCI channel 2 grant
AE24
pci_arb_gnt_3_n
6
N/A
O
PCI channel 3 grant
AD25
pci_arb_req_1_n
2
N/A
I
PCI channel 1 request
AB23
pci_arb_req_2_n
2
N/A
I
PCI channel 2 request
AC22
pci_arb_req_3_n
2
N/A
I
PCI channel 3 request
AF23
pci_central_resource_n
D
N/A
I
PCI internal central resource enable
AF25
pci_int_a_n
2
N/A
I/O
PCI interrupt request A, output if external
central resource used
AF24
pci_int_b_n
2
N/A
I/O
PCI interrupt request B, CCLKRUN# for
CardBus applications
AE23
pci_int_c_n
2
N/A
I
PCI interrupt request C
Pin #
Signal name
U/D
OD
(mA)
I/O
Description
Table 8: PCI interface pinout