28222-13 View Datasheet(PDF) - Conexant Systems

Part Name

Description

Manufacturer

28222-13

ATM Transmitter/Receiver with UTOPIA Interface

Conexant Systems 

2.0 Functional Description

2.2 Line Framers

CN8223

ATM Transmitter/Receiver with UTOPIA Interface

2.2.2 Internally Framed Receive Line Interface

In internal framer mode, the receiver inputs are positive and negative pulse

indications, and the receive clock (and NRZ serial data if internal B3ZS/HDB3

decoding is disabled) comes from an external LIU.

Table 2-4 lists the interface connections for all of the internal framing modes.

The functional timing for the receive line interface is similar for all internal

framer modes. Figure 2-5 illustrates the interface timing when the internal

B3ZS/HDB3 decoder is enabled. The RXPOS and RXNEG inputs are sampled on

the falling edge of the RXCKI clock input. Data inputs can be sampled on the

rising edge of the input clock by setting Invert RX Clock Sampling [bit 8] in

register CONFIG_3 [0x02].

Table 2-4. Internal Framer Receiver Interface Connections

Signal Name

Connect to CN8223 Pin

Receive Clock Input (RXCKI)

Receive Positive Data (RXPOS)

Receive Negative Data (RXNEG)

Receive Loss of Signal (RXLOS~~)

RXCKI

RXIN[1]

RXIN[2]

RXIN[4]

Figure 2-5. Internal Framer Receiver Interface Timing

RXCKI

RXPOS

RXNEG

2-6

Conexant

100046C

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