XRT94L31IB Exar Corporation, XRT94L31IB Datasheet - Page 18

• Manufacturer Part Number: XRT94L31IB
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L31IB

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 3.14 V ~ 3.47 V
• Package / Case: 504-LBGA
• Mounting Type: Surface Mount
• Product: Mapper
• Lead Free Status / RoHS Status: Contains lead / RoHS Compliant

XRT94L31
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
PIN DESCRIPTION OF THE XRT94L31 (REV. B)
PIN #
AA3
W2
G3
K5
D1
F3
H4
D2
E3
J4
J5
SIGNAL NAME
RxD_CLK
RxD_PL
TxA_PL
TxA_D0
TxA_D1
TxA_D2
TxA_D3
TxA_D4
TxA_D5
TxA_D6
TxA_D7
STS-3/STM-1 TELECOM BUS INTERFACE - RECEIVE DIRECTION
I/O
O
O
I
I
CMOS
CMOS
TTL
TTL
TYPE
Transmit STS-3/STM-1 Telecom Bus Interface - Payload Data Indica-
tor Output Signal:
This output pin indicates whether or not the Transmit STS-3/STM-1 Tele-
com Bus Interface is currently placing a Transport Overhead byte or a
non-Transport Overhead Byte (e.g., STS-1 SPE, STS-3c SPE, VC-3 or
VC-4 data) via the TXA_D[7:0] output pins.
This output pin is pulled "Low" for the duration that the Transmit STS-3/
STM-1 Telecom Bus Interface is transmitting a Transport Overhead byte
via the TXA_D[7:0] output pins.
Conversely, this output pin is pulled "High" for the duration that the
Transmit STS-3/STM-1 Telecom Bus Interface is transmitting something
other than a Transport Overhead byte via the TXA_D[7:0] output pins.
Transmit STS-3/STM-1 Telecom Bus Interface - Transmit Output
Data Bus pins:
These 8 output pins function as the Transmit STS-3/STM-1 Telecom Bus
Interface - Output data bus. If the STS-3/STM-1 Telecom Bus Interface
is enabled, then all outbound STS-3/STM-1 data is output via these pins
(in a byte-wide manner), upon the rising edge of the TXA_CLK output
pin.
Receive STS-3/STM-1 Telecom Bus Interface - Clock Input Signal:
This input clock signal functions as the clock source for the Receive
STS-3/STM-1 Telecom Bus Interface. All input signals are sampled
upon the falling edge of this input clock signal.
This clock signal should operate at 19.44MHz.Note:
N
Receive STS-3/STM-1 Telecom Bus Interface - Payload Data Indica-
tor Output Signal:
This input pin indicates whether or not the Receive STS-3/STM-1 Tele-
com Bus Interface is currently receiving Transport Overhead bytes or
non-Transport Overhead bytes (e.g., STS-1 SPE, STS-3c SPE,VC-3 or
VC-4 data) via the RXD_D[7:0] input pins.
This input pin should be pulled "Low" for the duration that the Receive
STS-3/STM-1 Telecom Bus Interface is receiving a Transport Overhead
byte via the RXD_D[7:0] input pins.
Conversely, this input pin should be pulled "High" for the duration that
the Receive STS-3/STM-1 Telecom Bus Interface is receiving something
other than a Transport Overhead byte via the RXD_D[7:0] input pins.
N
OTE
OTE
: This input pin is only used if the STS-3/STM-1 Telecom Bus has
: Connect this pin to GND if the STS-3/STM-1 Telecom Bus is NOT
been enabled. It should be connected to GND otherwise.
enabled
18
DESCRIPTION
REV. 1.0.1