XIO2001_16 Datasheet, PDF (14/141 Pages) Texas Instruments – PCI Express to PCI Bus Translation Bridge

XIO2001
SCPS212I – MAY 2009 – REVISED JANUARY 2016
www.ti.com
SIGNAL
GPIO3 // SDA
GPIO4 // SCL
GRST
PCLK66_
SEL
SERIRQ
VREG_
PD33
ZGU
BALL
NO.
N11
ZAJ
BALL
NO.
L08
M10
M10
N13
M11
B12
A11
N08
M08
D12
E11
Miscellaneous Pins (continued)
PNP
PIN
NO.
58
59
66
98
52
90
I/O
TYPE
I/O
I/O
I
I
I/O
I
CELL
TYPE
LV
CMOS
LV
CMOS
LV
CMOS
LV
CMOS
PCI
Bus
LV
CMOS
CLAMP
RAIL
EXTERNAL
PARTS
DESCRIPTION
V_{DD_33}
V_{DD_33}
V_{DD_33}
_COMBIO
V_{DD_33}
PCIR
V_{DD_33}
_COMBIO
GPIO3 or serial-bus data. This terminal
functions as serial-bus data if a pullup
resistor is detected on SCL or when the
SBDETECT bit is set in the Serial Bus
Optional pullup
resistor
Control and Status Register (see Serial-
Bus Control and Status Register). If no
pullup is detected then this terminal
functions as GPIO3.
Note: In serial-bus mode, an external
pullup resistor is required to prevent the
SDA signal from floating.
GPIO4 or serial-bus clock. This terminal
functions as serial-bus clock if a pullup
resistor is detected on SCL or when the
SBDETECT bit is set in the Serial Bus
Control and Status Register (see Serial-
Bus Control and Status Register). If no
pullup is detected then this terminal
Optional pullup _{functions as GPIO4.}
resistor
Note: In serial-bus mode, an external
pullup resistor is required to prevent the
SCL signal from floating.
Note: This terminal has an internal
active pullup resistor. The pullup is only
active when reset is asserted or when
the GPIO is configured as an input.
Global reset input. Asynchronously
resets all logic in device, including sticky
bits and power management state
–
machines.
Note: The GRST input buffer has both
hysteresis and an internal active pullup.
The pullup is active at all times.
Optional
pulldown
resistor
PCI clock select. This terminal
determines the default PCI clock
frequency driven out the CLKOUTx
terminals.
0 = 50 MHz PCI Clock
1 = 66 MHz PCI Clock
Note: This terminal has an internal
active pullup resistor. This pullup is
active at all times.
Note: M66EN terminal also has an
affect of PCI clock frequency.
Pullup or
pulldown
resistor
Pulldown
resistor
Serial IRQ interface. This terminal
functions as a serial IRQ interface if a
pullup is detected when PERST is
deasserted. If a pulldown is detected,
then the serial IRQ interface is disabled.
3.3-V voltage regulator powerdown. This
terminal should always be tied directly to
ground or an optional pulldown resistor
can be used.
14
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