XRT94L31IB Exar Corporation, XRT94L31IB Datasheet - Page 20

• 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)
AA4A
PIN #
AD2
AC3
AD3
AA5
G5
Y2
B4
Y1
H6
SIGNAL NAME
TxTOHEnable
TxTOHClk
RxD_D0
RxD_D1
RxD_D2
RxD_D3
RxD_D4
RxD_D5
RxD_D6
RxD_D7
SONET/SDH OVERHEAD INTERFACE - TRANSMIT DIRECTION
I/O
O
O
I
TTL
CMOS
CMOS
TYPE
Receive STS-3/STM-1 Telecom Bus Interface - Receive Input Data
Bus pins:
These 8 input pins function as the Receive STS-3/STM-1 Telecom Bus
Interface Receive Input data bus. All STS-3/STM-1 data is sampled and
latched (into the XRT94L31, via these input pins) upon the falling edge
of the RXA_CLK input pin.
N
Transmit TOH Input Port - Clock Output:
This output pin, along with the TxTOHEnable, TxTOHFrame output pins
and the TxTOH and TxTOHIns input pins function as the Transmit TOH
Input Port.The Transmit TOH Input Port is usedr to insert the users own
value for the TOH bytes (in the outbound STS-3/STM-1 signal).
This output pin provides the user with a clock signal. If the TxTOHEn-
able output pin is "High" and if the TxTOHIns input pin is pulled "High",
then the user is expected to provide a given bit (within the TOH) to the
TxTOH input pin, upon the falling edge of this clock signal. The data,
residing on the TxTOH input pin will be latched into the XRT94L31 upon
the rising edge of this clock signal. The XRT94L31 will then insert this
particular TOH bit value into the appropriate TOH bit positions within the
outbound STS-3 data-stream.
N
Transmit TOH Input Port - TOH Enable (or READY) indicator:
This output pin, along with the TxTOHClk, TxTOHFrame output pins and
the TxTOH and TxTOHIns input pins function as the Transmit TOH Input
Port.
This output pin will toggle and remain "High" anytime the Transmit TOH
Input Port is ready to externally accept TOH data.
To externally insert user values of TOH into the outbound STS-3 data
stream via the Transmit TOH Input Port, do the following.
•
•
•
OTE
OTE
Continuously sample the state of TxTOHFrame and this output pin
upon the rising edge of TxTOHClk.
Whenever this output pin pulses "High", then the user's external
circuitry should drive the TxTOHIns input pin "High".
rising edge of TxTOHClk
Next, output the next TOH bit, onto the TxTOH input pin, upon the
: These input pins are only active if the Receive STS-3/STM-1
: The Transmit TOH Input Port only supports the insertion of the
Telecom Bus Interface has been enabled. If the XRT94L31 is
configured to exchange STS-3/STM-1 data via the PECL
Interface (instead), tie these pins to GND.
TOH within the first STS-1, within the outbound STS-3 signal.
20
DESCRIPTION
REV. 1.0.1