PXB4219E Datasheet, PDF (38/290 Pages) Infineon Technologies AG – Interworking Element for 8 E1/T1 Lines

IWE8, V3.4
PXB 4219E, PXB 4220E, PXB 4221E
Functional Description
3.3
Functional Block Description
Table 11
Block
FR
OR
OQ
CR
UR
Functions of IWE8 Blocks
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
mode and UTOPIA level 2 single PHY mode
• Output buffer for 4 cells
Data Sheet
38
2003-01-20