pxb4219 Infineon Technologies Corporation, pxb4219 Datasheet - Page 43

• Manufacturer Part Number: pxb4219
• Description: Iwe8 Interworking Element For 8 E1/t1 Lines
• Manufacturer: Infineon Technologies Corporation

Table 11
Block
OT
FT
SL
OM
EQ
MP
RM
Data Sheet
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
• 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
framer port
Functions of IWE8 Blocks
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PXB4219 / PXB4220 / PXB4221
Functional Description
2002-05-06