PXB4219 Datasheet, PDF (43/290 Pages) Infineon Technologies AG – IWE8 Interworking Element for 8 E1/T1 Lines

PXB4219 / PXB4220 / PXB4221
Functional Description
Table 11
Block
OT
FT
SL
OM
EQ
MP
RM
Functions of IWE8 Blocks
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
• FTCLK synchronization
• 8 bit parallel to serial conversion
• Generation of frame and multiframe synchronization signals
• Timeslot counter
• Timeslot assignment and channel configuration (RAM2, RAM3)
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
43
2002-05-06