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28233-11

ATM Transmitter/Receiver with UTOPIA Interface

Conexant Systems 

CN8223

ATM Transmitter/Receiver with UTOPIA Interface

1.0 Product Description

1.5 FIFO Port/UTOPIA Interface

1.5.3 ATM Interface

Each cell is sent to a buffer to allow for header processing before being output to

the ATM interface. The buffer length is 10 octets for G.751 PLCP modes, and 6

octets for HEC alignment. A “cell-valid” output is provided to indicate that none

of the enabled error checks detected an error. The UTOPIA internal FIFO or

external circuitry is notified to discard the cell when the valid indication goes

inactive. Idle cells are automatically deleted from the ATM layer output. Parity

and control/delineation signals are provided with each octet at the port interface.

The microprocessor receives status and error counts as cell validation proceeds.

All event and error counters can be programmed to cause an interrupt on

overflow. Reading the interrupt source register allows the microprocessor to

identify overflows and thus update internal counts. All counters can be read by the

microprocessor and are cleared when read.

100046C

Conexant

1-11

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