XRT94L43IB-F Exar Corporation, XRT94L43IB-F Datasheet - Page 171

• 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
XRT94L43
SONET/SDH OC-12 TO 12XDS3/E3 MAPPER
AC12
AC10
AF14
AB10
AA15
AC11
P
AD7
AD6
C17
A11
B12
A12
E11
D8
D7
A6
IN
#
TxPOHFrame_0
TxPOHFrame_1
TxPOHFrame_2
TxPOHFrame_3
TxPOHFrame_4
TxPOHFrame_5
TxPOHFrame_6
TxPOHFrame_7
TxPOHFrame_8
TxPOHFrame_9
TxPOHFrame_10
TxPOHFrame_11
TxPOHFrame_12
TxPOHFrame_13
TxPOHFrame_14
TxPOHFrame_15
S
IGNAL
N
AME
I/O
O
S
CMOS
T
IGNAL
YPE
Transmit Path Overhead Input Port - Frame Output pin:
These output pins, along with the TxPOH_n, TxPOHEnable_n,
TxPOHIns_n and TxPOHClk_n function as the Transmit Path Overhead
Input Port.
The function of these output pins depends upon whether POH or TOH
data is inserted via the TxPOH_n input pins.
If the user is only inserting POH data via these input pins:
In this mode, the TxPOH port will pulse these output pins "High" when-
ever it is ready to accept and process the J1 byte (e.g., the very first
POH byte) via this port.
If the user is inserting both POH and TOH data via these input pins:
In this mode, the TxPOH port will pulse these output pins "High" coinci-
dent with the following.
1. Whenever the TxPOH port is ready to accept and process the A1 byte
(e.g., the very first TOH byte) via this port.
2. Whenever the TxPOH port is ready to accept and process the J1 byte
(e.g., the very first POH byte) via this port.
N
If the TxPOHEnable_n output pin is "High" while the TxPOHFrame_n
output pin is "High", then the TxPOH port is ready to process the J1
(POH) bytes.
OTE
: The external circuitry can determine whether the TxPOH port is
expecting the A1 byte or the J1 byte, by checking the state of
the
TxPOHEnable_n output pin is "Low" while the TxPOHFrame_n
output pin is "High", then the TxPOH port is ready to process
the A1 (TOH) bytes.
165
corresponding
D
ESCRIPTION
TxPOHEnable
output
pin.
REV. 1.0.2
If
the