PXB4221 Infineon Technologies AG, PXB4221 Datasheet - Page 41

• Manufacturer Part Number: PXB4221
• Description: IWE8 Interworking Element for 8 E1/T1 Lines
• Manufacturer: Infineon Technologies AG

3.3
Table 11
Block
FR
OR
OQ
CR
UR
Data Sheet
Functional Block Description
Functions
Framer Receive interfaces
• FRCLK synchronization
• 8 bit serial to parallel conversion
• Frame and multiframe synchronization
• Timeslot counter
• Timeslot assignment and channel configuration (RAM1)
Octet Receive processing
ATM ports:
• Cell delineation
• HEC check: Header error detection and correction
• Cell payload de scrambling
• Idle or Unassigned Cell Deletion
• Statistics counter event generation
• Write to ATM Receive Buffer
AAL ports:
• Segmentation port de correlation
• Segmentation
• SN/SNP generation
• SDT pointer generation
• RTS value insertion
• Statistics counter event generation
• Write to Segmentation Buffer
Output Queue
• FIFO containing 256 addresses of cells to be sent to UTOPIA Receive
Cell Receive processing
ATM ports:
• Read cells from ATM receive buffer
AAL ports:
• Read cells from AAL segmentation buffer
• Padding of partially filled cells
UTOPIA Receive interface
• Cell level handshake
• Mapping of framer port number into ATM header in UTOPIA level 1
• Output buffer for 4 cells
mode and UTOPIA level 2 single PHY mode
Functions of IWE8 Blocks
41
PXB4219 / PXB4220 / PXB4221
Functional Description
2002-05-06