PXB4340E Datasheet, PDF (67/185 Pages) Infineon Technologies AG – ICs for Communications

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These registers are used to insert ATM cells into the cell stream and to extract or copy cells from
the cell stream. For the insertion one set of 27 registers (TXR0...TXR26) is provided capable of
storing a complete ATM cell in UTOPIA cell format. When assembled the ATM cell is inserted
into either up- or downstream data stream via the command register TMCR. For cell extraction/
copy an internal 12-cell receive buffer is provided. A non-empty receive buffer is signalled via bit
9 of interrupt status register ISR0. Cells are read from the internal receive buffer by repeated
reading of the RXRCEL register.
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Read/write Address 80_H...82_H
Value after reset 0000_H (for all)
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80 TXR0
81 TXR1
82 TXR2
Header octet 1
Header octet 3
UDF1(7:0)


Header octet 2
Header octet 4
UDF2(7:5)
PN(4:0)
Header octets 1..4 as well as UDF1 and UDF2 octets are mapped transparently to the cell. The
only field which is interpreted by the AOP is PN(4:0); it selects the (internal) PHY port number
the cell is destined to. For the determination of the UTOPIA port number and header formats see
VHFWLRQ . In case of 8-bit UTOPIA PN(4:0) is evaluated but not transferred to the data stream.
Data Sheet
3-67
04.2000