XRT83VSH28ES Exar, XRT83VSH28ES Datasheet - Page 17

• Manufacturer Part Number: XRT83VSH28ES
• Description: Peripheral Drivers & Components - PCIs 8 CH E1 LIU SH (low cost version)
• Manufacturer: Exar

Specifications of XRT83VSH28ES

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

REV. 2.0.0
ALARM FUNCTIONS/REDUNDANCY SUPPORT
S
IGNAL
RXTSEL
TXTSEL
GAUGE
RESET
SR/DR
DMO0
DMO1
DMO2
DMO3
DMO4
DMO5
DMO6
DMO7
N
AME
L
BGA
EAD
C15
C13
U17
V14
U11
V11
J18
D5
D4
R5
P4
K4
T8
#
T
YPE
O
I
I
I
I
I
Twisted Pair Cable Wire Gauge Select
Hardware Mode Only
This pin is used to match the frequency characteristics according to the gauge of
wire used in Telecom circuits. By default, the LIU is matched to 22 gauge or 24
gauge wire. To select 26 gauge, this pin must be pulled "High".
N
Digital Monitor Output
When no transmit output pulse is detected for more than 128 TCLK cycles within the
transmit output buffer, the DMO pin will go "High" for a minimum of one TCLK cycle.
DMO will remain "High" until the transmitter sends a valid pulse.
N
Hardware Reset Input
Active low signal. When this pin is pulled "Low" for more than 10µS, the internal reg-
isters are set to their default state. See the register description for the default val-
ues.
N
Single-Rail/Dual-Rail Data Format
Hardware Mode Only
This pin is used to control the data format on the facility side of the LIU to interface to
a Framer or Mapper/ASIC device. By default, dual rail mode is selected which relies
upon the Framer to handle the encoding/decoding functions. To select single rail
mode, this pin must be pulled "High". If single rail mode is selected, the LIU can
encode/decode AMI or HDB3 data formats.
N
Receiver Termination Select
Hardware Mode
This pin is used to select between the internal and external impedance modes for
the receive path. By default, the receivers are configured for external impedance
mode, which is ideal for redundancy applications without relays. To select internal
impedance, this pin must be pulled "HIgh".
Host Mode
Internal/External impedance can be selected by programming the appropriate chan-
nel registers. However, to assist in redundancy applications, this pin can be used for
a hard switch if the RxTCNTL bit is set "High" in the appropriate global register. If
RxTCNTL is set "High", the individual RxTSEL register bits are ignored.
N
Transmitter Termination Select
Hardware Mode
This pin is used to select between the internal and external impedance modes for
the transmit path. By default, the receivers are configured for external impedance
mode, which is ideal for redundancy applications without relays. To select internal
impedance, this pin must be pulled "HIgh".
N
OTE
OTE
OTE
OTE
OTE
OTE
: Internally pulled “Low” with a 50k resistor.
: This pin can be used for redundancy applications to initiate an automatic
: Internally pulled "High" with a 50K resistor.
: Internally pulled “Low” with a 50k resistor.
: This pin is internally pulled “Low” with a 50k resistor.
: This pin is internally pulled "Low".
switch to a backup card.
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
14
D
ESCRIPTION
XRT83VSH28