XRT59L91ES Exar, XRT59L91ES Datasheet - Page 4

• Manufacturer Part Number: XRT59L91ES
• Description: Peripheral Drivers & Components - PCIs 1 CH E1 AFE
• Manufacturer: Exar

Specifications of XRT59L91ES

• Product Category: Peripheral Drivers & Components - PCIs
• Rohs: yes

PIN DESCRIPTION
XRT59L91
Pin#
3
4
5
Rev. 1.0.0
Symbol
TxNEG
RLoop
LLoop
Type
I
I
I
Description
Transmit – Negative Data Input:
The exact signal that should be applied to this input pin depends
upon whether the user intends to operate the “Transmit Section” (of
the device) in the “Clocked” or “Clockless” Mode.
Clocked Mode -
The Terminal Equipment should apply bit-wide NRZ pulses on this
input pin, whenever the Terminal Equipment needs to transmit a
“negative-polarity” pulse onto the line via TTIP and TRing output
pins. The XRT59L91 device will sample this input pin upon the
falling edge of the TClk signal.
Clockless Mode -
The Terminal Equipment should apply RZ pulses to this input pin,
anytime the Terminal Equipment needs to transmit a “negative-
polarity” pulse onto the line via TTIP and TRing output pins.
Local Loopback Input Select:
This input pin permits the user to configure the XRT59L91 device to
operate in the “Local Loopback” Mode; in order to support Diagnostic
Operations.
When the XRT59L91 device is operating in the Local Loopback
Mode, then TTIP and TRing output signals will be (internally)
routed to RTIP and RRing input signals.
Setting this input pin “high” configures the XRT59L91 device to
operate in the “Local Loopback” Mode. Setting this input pin “low”
configures the XRT59L91 device to operate in the “Normal” Mode.
Note: Pulling both the “LLoop” and “RLoop” input pins to VDD,
simultaneously, will cause the XRT59L91 device to operate in the “In-
Circuit Test” Mode. In this mode, all output pins will be tri-stated.
Remote Loopback Input Select:
This input pin permits the user to configure the XRT59L91 device to
operate in the “Remote Loopback” Mode; in order to support Diagnos-
tic Operations.
When the XRT59L91 device is operating in the Remote Loopback
Mode, then the RxPOS and RxNEG output pins will be (internally)
routed to the TxPOS and TxNEG input pins.
Setting this input pin “high” configures the XRT59L91 device to
operate in the “Remote Loopback” Mode. Setting this input pin “low”
configures the XRT59L91 device to operate in the “Normal” Mode.
Note: Pulling both the “LLoop” and “RLoop” input pins to VDD,
simultaneously, will cause the XRT59L91 device to operate in the “In-
Circuit Test” Mode. In this mode, all output pins will be tri-stated.
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