xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 193

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
2.2.6.9
The Transmit ATM Cell Processor block consists of a “Transmit Cell Extraction Buffer/Processor” block.
Figure 26 presents the functional block diagram of the “Transmit ATM Cell Processor block with the “Transmit
Cell Extraction Buffer/Processor” block highlighted.
Figure 26: Illustration of the Transmit ATM Cell Processor block Functional Block Diagram, with the
“Transmit Cell Extraction Buffer/Processor” block highlighted
The Transmit Cell Extraction Buffer/Processor block permits the user to read out the contents of an “inbound”
ATM cell via the Microprocessor Interface. If the user configures the “Transmit User Cell Filter” appropriately,
the “Transmit User Cell Filter” will copy (e.g., replicate) the contents of certain cells (which comply with the
user cell filtering requirements).
Buffer/Processor” block where it can be read out and processed by the Microprocessor Interface.
Transmit UTOPIA
T
Interface Block
HE
TxFIFO
TxFIFO
T
RANSMIT
Main Data Path
C
ELL
E
XTRACTION
Generator
Checker
Generator
Checker
Parity
Idle Cell
Block
Parity
Idle Cell
Block
These copied cells will be routed to the “Transmit Cell Extraction
B
UFFER
User Cell
Calculation
HEC Byte
User Cell
Calculation
Insertion
HEC Byte
Filter
Block
/P
Insertion
193
Filter
Block
Block
Block
ROCESSOR
&
&
Cell Extraction
Cell Insertion
Cell Extraction
Transmit GFC
Cell Insertion
Cell Payload
Processor
Transmit GFC
Processor
Nibble-Field
Cell Payload
Scrambler
Processor
Processor
Nibble-Field
Buffer/
Buffer/
Input Port
Scrambler
Buffer/
Buffer/
Input Port
Block
Block
Block
Block
Microprocessor
Microprocessor
Processor Block
SONET/STS-3c
To Transmit
Input Port
Interface
Interface
TxGFC
Block
Block
POH
XRT94L33
Rev.1.2.0.