28222-13 View Datasheet(PDF) - Conexant Systems

Part Name

Description

Manufacturer

28222-13

ATM Transmitter/Receiver with UTOPIA Interface

Conexant Systems 

CN8223

ATM Transmitter/Receiver with UTOPIA Interface

2.0 Functional Description

2.2 Line Framers

Figure 2-10 illustrates the transmit timing for the E3 interface. TXCKI has a

frequency of 34.368 MHz. TXSYI has a rising edge after the sampling of the last

bit of the frame alignment signal. TXDATO is the output signal; it transitions in

response to the falling edge of TXCKI, and can be sampled on the following

falling edge. This timing is compatible with the Conexant Bt8330B DS3/E3

framer using the TXOVH output. The frame alignment signal position is filled

with the value 0xCCCC. This value provides the four overhead bits (required by

ETSI prETS 300 214) that follow the frame alignment signal defined by ITU

G.751.

Figure 2-10. E3 Interface Transmit Timing

TXCKI

TXSYI

TXDATO

XX X X X X X X X X 1 1 0 0

Frame Alignment Signal Position

Information Field

2.2.4 Externally Framed Receive Line Interface

The CN8223 external receive line interface has three inputs: clock, data, and

frame sync. Frame sync can be a multiple of the frame period. Table 2-7 lists the

receiver connections for all external framing modes. The receive line inputs

consist of the receive clock (RXCKI), the receive sync input (RXSYI), and the

receive data input (RXDATI) when the external framer mode is selected.

Table 2-7. External Framing Mode Receiver Connections

Signal Name

Connect to CN8223 Pin

Receive Clock Input (RXCKI)

Receive Sync Input (RXSYI)

Receive Data Input (RXDATI)

Receive Loss of Signal (RXLOS~)

RXCKI

RXIN[3]

RXIN[0]

RXIN[4]

100046C

Conexant

2-11

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