PXB4219E Datasheet, PDF (40/290 Pages) Infineon Technologies AG – Interworking Element for 8 E1/T1 Lines

IWE8, V3.4
PXB 4219E, PXB 4220E, PXB 4221E
Functional Description
Table 11
Block
OT
FT
SL
OM
EQ
MP
RM
Functions of IWE8 Blocks (cont’d)
Functions
Octet Transmit processing
ATM ports:
• Reading octets from ATM Transmit Buffer
• Cell rate de coupling: idle/unassigned cell insertion
• Cell payload scrambling
• HEC generation
AAL ports:
• Read octets from Reassembly Buffer
• Handling of Reassembly Buffer Overflow
• Handling of Reassembly Buffer underflow
• Reassembly Buffer initialization to compensate CDV
• Synchronization of AAL1 start of structure with synchronization pulse of
framer port
• Statistics counter event generation
Framer Transmit interfaces
• FTCKO synchronization
• 8 bit parallel to serial conversion
• Generation of frame and multiframe synchronization signals
• Timeslot counter
• Timeslot assignment and channel configuration (RAM2, RAM3, RAM4)
Serial Loop
• Serial loopback from Framer Transmit to Framer Receive
OAM processing
• Processing of OAM counter events
• Interrupt queue control
• Microprocessor access control to external RAM
Event Queue
• FIFO of 256 OAM counter events
Microprocessor interface
• Synchronization of asynchronous microprocessor interface signals
• Internal registers
• Interrupt generation
External RAM interface
• Generation of external RAM interface signals
• Generation of basic RAM cycle
• Access control to external RAM for different blocks
• Parity generation and checking
Data Sheet
40
2003-01-20