28222-13 View Datasheet(PDF) - Conexant Systems

Part Name

Description

Manufacturer

28222-13

ATM Transmitter/Receiver with UTOPIA Interface

Conexant Systems 

1.0 Product Description

1.8 CN8223 Applications

CN8223

ATM Transmitter/Receiver with UTOPIA Interface

Figure 1-10 illustrates an example implementation of the CN8223 using a

TDK 78P7200 T3 LIU. Unused pins on the CN8223 must be tied as follows:

unused RXIN_8:0 pins tie to ground, PECL inputs RXCKI_HS±, RXIN_HS±,

and TXCKI_HS± tie to +5 V.

Figure 1-10. CN8223 Connected to TDK 78P7200

CN8223

Pin

31

TCLKO

35 TXOUT[2]

ATM Cells

Layer

34 TXOUT[1]

10

RXCKI

17

RXIN[2]

16

RXIN[1]

19

RXIN[4]

30

TXCKI

Signal

TDK 78P7200

TCLK

TNEG

TPOS

RCLK

RNEG

RPOS

LOWSIG

Pin

27

Tx

15

14

23

24

25 Rx

27

System Clock

(44.736 MHz)

1.8.1 CN8223 as a DS3 or E3 G.751 Framer without ATM Cell Delineation

The CN8223 can be used as a DS3 or an E3 G.751 framer with parallel input and

serial output by making the following changes:

• Set the configuration registers for transparent operation.

• Disable the parallel interface.

• Disable line loopback.

In this setup, the receive frame sync pulse is on pin 43, TXOUT[5]. Data is

received on pin 56, TXOUT[6]. The receive clock is derived from the LIU device.

Data is transmitted through the parallel UTOPIA interface.

1-16

Conexant

100046C

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