XR17V354IB-E4-EVB Datasheet, PDF (3/67 Pages) Exar Corporation – HIGH PERFORMANCE QUAD PCI-EXPRESS UART

REV. 1.0.4
XR17V354
HIGH PERFORMANCE QUAD PCI-EXPRESS UART
PIN DESCRIPTIONS
NAME
PIN #
TYPE
DESCRIPTION
PCIe SIGNALS
CLK+
CLK-
G4
I PCIe reference clock input. (Nominal single-ended swing from 0 to 700 mV.)
H4
I
TX+
J1
O PCIe differential TX outputs. Must be AC coupled using 0.1 uF non-polarized
TX-
J2
O ^{capacitor (0603 or smaller) near the transmitting source.}
RX+
G1
I PCIe differential RX inputs. Must be AC coupled using 0.1 uF non-polarized
RX-
G2
I ^{capacitor (0603 or smaller) near the transmitting source.}
CLKREQ#
L1
O PCIe edge connector clock request
PERST#
L2
I PCIe edge connector reset
REXT
H3
Connect a 191 ohm 1% resistor to GND. This is used for PCIe PHY calibra-
tion.
MODEM OR SERIAL I/O INTERFACE
TX0
N13
O UART channel 0 Transmit Data or infrared transmit data.
RX0
M13
I UART channel 0 Receive Data or infrared receive data. Normal RXD input
idles at HIGH condition. The infrared pulses can be inverted internally prior to
decoding by setting FCTR bit [4]. If unused, a pull-up or pull-down resistor is
recommended on this pin.
RTS0#
P15
O UART channel 0 Request to Send or general purpose output (active LOW).
CTS0#
N14
I UART channel 0 Clear to Send or general purpose input (active LOW). If
unused, a pull-up or pull-down resistor is recommended on this pin.
DTR0#
N15
O UART channel 0 Data Terminal Ready or general purpose output (active
LOW).
DSR0#
M14
I UART channel 0 Data Set Ready or general purpose input (active LOW). If
unused, a pull-up or pull-down resistor is recommended on this pin.
CD0#
L13
I UART channel 0 Carrier Detect or general purpose input (active LOW). If
unused, a pull-up or pull-down resistor is recommended on this pin.
RI0#
L14
I UART channel 0 Ring Indicator or general purpose input (active LOW). If
unused, a pull-up or pull-down resistor is recommended on this pin.
TX1
L15
O UART channel 1 Transmit Data or infrared transmit data.
RX1
K14
I UART channel 1 Receive Data or infrared receive data. Normal RXD input
idles at HIGH condition. The infrared pulses can be inverted prior to decoding
by setting FCTR bit [4]. If unused, a pull-up or pull-down resistor is recom-
mended on this pin.
RTS1#
K13
O UART channel 1 Request to Send or general purpose output (active LOW).
CTS1#
K15
I UART channel 1 Clear to Send or general purpose input (active LOW). If
unused, a pull-up or pull-down resistor is recommended on this pin.
DTR1#
J13
O UART channel 1 Data Terminal Ready or general purpose output (active
LOW).
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