PXB4219E Datasheet, PDF (83/290 Pages) Infineon Technologies AG – Interworking Element for 8 E1/T1 Lines

IWE8, V3.4
PXB 4219E, PXB 4220E, PXB 4221E
Operational Description
4.9
Cell Insertion
This block allows the insertion of predefined cells stored in the Cell Insertion Buffer into
the UTOPIA receive cell stream.
The Cell Insertion Buffer, located in external RAM, offers space for one ATM cell. The
ATM cell except of the UDF octet needs to be written to the Cell Insertion Buffer via the
Microprocessor interface. When transferring the cell to the UTOPIA receive interface an
UDF of 00_H will be inserted.
Cell insertion is activated by setting the bit “insert_cell” in the Command Register (“cmd”,
see Chapter 7.31) the cell is then read from the Cell Insertion Buffer and forwarded to
the UTOPIA Receive Interface.
The port number is generated randomly. Depending on the UTOPIA mode selection, it
will be mapped either on the UTOPIA address bus or in the ATM header
(“mapping_mode” = 2, 3, 4 or 5 in register “utconf”) overwriting the predefined values.
Data Sheet
83
2003-01-20