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PXB4219 Datasheet, PDF (41/290 Pages) Infineon Technologies AG – IWE8 Interworking Element for 8 E1/T1 Lines | |||
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PXB4219 / PXB4220 / PXB4221
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
41
2002-05-06
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