XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 29

• Manufacturer Part Number: XRT94L33IB-L
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L33IB-L

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

xr
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
C8
B5
B6
TXPOHENABLE
TXPOHFRAME
TXPOHINS
O
O
I
TTL
TTL
TTL
Transmit Path Overhead Input Port – Frame Output pin:
This pin is used for the Transmit AU-4/VC-4 Mapper POH
Processor Block when TUG-3 mapping is used.
This output pin, along with the “TxPOH”, “TxPOHEnable”,
“TxPOHIns” and “TxPOHClk” function as the “Transmit Path
Overhead Input Port”.
If the user is only inserting POH data via these input pins:
Note:
Transmit Path Overhead Input Port – Insert Enable Input
pin:
This pin is used for the Transmit AU-4/VC-4 Mapper POH
Processor Block when TUG-3 mapping is used.
These input pins, along with “TxPOH”, “TxPOHEnable”,
“TxPOHFrame” and “TxPOHClk” function as the “Transmit
Path Overhead (TxPOH) Input Port.
These input pins permit the user to enable or disable the
“TxPOH” input port.
If these input pins are pulled “high”, then the “TxPOH” port will
sample and latch data via the corresponding “TxPOH” input
pins, upon the falling edge of “TxPOHClk”.
Note:
Transmit Path Overhead Input Port – POH Indicator
Output pin:
This pin is used for the Transmit AU-4/VC-4 Mapper POH
Processor Block when TUG-3 mapping is used.
These output pins, along with “TxPOH”, “TxPOHIns”,
“TxPOHFrame” and “TxPOHClk” function as the “Transmit
Path Overhead (TxPOH) Input Port”.
These output pins will pulse “high” anytime the “TxPOH” port is
ready to accept and process POH bytes.
will be “low” at all other times.
29
In this mode, the “TxPOH” port will pulse these output
Conversely, if these input pins are pulled “low”, then
pins “high” whenever it is ready to accept and
process the J1 byte (e.g., the very first POH byte)
via this port.
the “TxPOH” port will NOT sample and latch data via
the corresponding “TxPOH” input pins.
These output pins
XRT94L33
Rev.1.2.0.