XRT94L43IB-F Exar Corporation, XRT94L43IB-F Datasheet - Page 30

• Manufacturer Part Number: XRT94L43IB-F
• Description: IC MAPPER SONET/SDH OC12 516BGA
• Manufacturer: Exar Corporation

Specifications of XRT94L43IB-F

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 2.5V, 3.3V
• Package / Case: 516-BBGA
• Mounting Type: Surface Mount
• Product: Mapper
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SONET/SDH OVERHEAD INTERFACE - TRANSMIT DIRECTION
REV. 1.0.2
P
H2
H4
D1
IN
#
TxTOHClk
TxTOHEnable
TxTOH
S
IGNAL
N
AME
I/O
O
O
I
S
CMOS
CMOS
T
IGNAL
TTL
YPE
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 allows the user to insert their own value for
the TOH bytes (in the outbound STS-12/STM-4 signal).
This output pin provides a clock signal. If the TxTOHEnable 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 XRT94L43 upon the rising edge
of this clock signal.
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.
If it is desired to externally insert a value of TOH into the outbound STS-
12 data stream via the Transmit TOH Input Port, then do the following:
•
•
•
Transmit TOH Input Port - Input Pin:
This input pin, along with the TxTOHIns input pin, the TxTOHEnable
and TxTOHFrame and TxTOHClk output pins function as the Transmit
TOH Input Port.
If it is desired to externally insert a value of TOH into the outbound STS-
12 data stream via the Transmit TOH Input Port, then do the following:
•
•
•
N
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".
Next, the user should output the next TOH bit, onto the TxTOH input
pin, upon the falling edge of TxTOHClk.
Continuously sample the state of TxTOHFrame and TxTOHEnable
upon the rising edge of TxTOHClk.
Whenever TxTOHEnable pulses "High", then the user's external
circuitry should drive the TxTOHIns input pin "High".
Next, the user should output the next TOH bit, onto this input pin,
upon the falling edge of TxTOHClk. The Transmit TOH Input Port will
sample the data (on this input pin) upon the rising edge of TxTOHClk.
: The Transmit TOH Input Port only support the insertion of the
: Data at this input pin will be ignored (e.g., not sampled) unless
TOH within the first STS-1, within the outbound STS-12 signal.
the TxTOHEnable output pin is "High" and the TxTOHIns input
pin is pulled "High".
24
SONET/SDH OC-12 TO 12XDS3/E3 MAPPER
D
ESCRIPTION
XRT94L43