XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 423

• 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

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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
2.3.4.5
The Receive ATM Cell Processor block consists of a “Receive Cell Extraction Buffer/Processor” block. Figure
103 presents the functional block diagram of the “Receive ATM Cell Processor block with the “Receive Cell
Extraction Buffer/Processor” block highlighted.
Figure 103 Illustration of the Receive ATM Cell Processor block Functional Block Diagram, with the
“Receive Cell Extraction Buffer/Processor” block highlighted
The Receive 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 “Receive User Cell Filter” appropriately,
the “Receive 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.
The Format of the ATM Cell that is Read from the “Receive Cell Extraction” Buffer
As the user reads out the contents of an ATM cell from the “Receive Cell Extraction” Buffer (via the
Microprocessor Interface), they will be expected to read this ATM cell data via a 32-bit wide register/buffer
interface.
Extraction” Buffer. The byte format of this 56-byte ATM cell is as illustrated below.
Figure 104 Byte Format of the ATM Cells that are read out from the “Receive Cell Extraction” Memory
Receive UTOPIA
As a consequence, the user must read out 56 byte size ATM cells from the “Receive Cell
T
Interface Block
HE
Main Data Path
RxFIFO
RxFIFO
R
ECEIVE
C
ELL
E
XTRACTION
Calculation
Calculation
Parity
Block
Parity
Block
These copied cells will be routed to the “Receive Cell Extraction
P
ROCESSOR
De-Scrambler
Cell Payload
De-Scrambler
User Cell
Cell Payload
User Cell
Idle Cell
Filter
Block
423
Idle Cell
Block
Filter
Block
Filter
Block
Filter
Cell Extraction
Cell Insertion
Cell Extraction
Cell Insertion
Processor
Processor
Verification
Processor
Processor
HEC Byte
Verification
Buffer/
Buffer/
HEC Byte
Buffer/
Buffer/
Block
Block
Receive GFC
Nibble-Field
Receive GFC
Nibble-Field
Output I/F
Output I/F
Microprocessor
Microprocessor
STS-3c/STS-12c
Processor Block
From Receive
Interface
Interface
Block
Block
POH
XRT94L33
Rev.1.2.0.