XRT72L56 datasheet(21/486 Pages) EXAR

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XRT72L56

SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

PRELIMINARY

REV. P1.1.2

XIX

RXE3 CONFIGURATION & STATUS REGISTER 2 (ADDRESS = 0X11) ........................................................ 453

RXE3 INTERRUPT ENABLE REGISTER - 2 (ADDRESS = 0X13) ................................................................. 453

RXE3 INTERRUPT STATUS REGISTER - 2 (ADDRESS = 0X15) ................................................................. 454

RXE3 INTERRUPT ENABLE REGISTER - 2 (ADDRESS = 0X13) ................................................................. 454

RXE3 INTERRUPT STATUS REGISTER - 2 (ADDRESS = 0X15) ................................................................. 454

RXE3 INTERRUPT ENABLE REGISTER - 2 (ADDRESS = 0X13) ................................................................. 455

RXE3 INTERRUPT STATUS REGISTER - 2 (ADDRESS = 0X15) ................................................................. 455

RXE3 CONFIGURATION & STATUS REGISTER 1 (ADDRESS = 0X10) ........................................................ 456

RXE3 INTERRUPT ENABLE REGISTER - 2 (ADDRESS = 0X13) ................................................................. 456

RXE3 INTERRUPT STATUS REGISTER - 2 (ADDRESS = 0X15) ................................................................. 456

RXE3 LAPD CONTROL REGISTER (ADDRESS = 0X18) ........................................................................... 457

7.0 diagnostic operation of the xrt72L56 framer ic .............................................................................. 458

Figure 213. Illustration of the Framer Local Loop-back path, within the XRT72L56 DS3/E3 Framer IC 458

8.0 High Speed HDLC Controller Mode of Operation ........................................................................... 460

8.1 CONFIGURING THE CHANNEL TO OPERATE IN THE HIGH SPEED HDLC CONTROLLER MODE ................................. 460

TABLE 93: ADDRESS LOCATIONS OF EACH OF THE HDLC CONTROL REGISTERS WITHIN THE XRT72L56 DE-

VICE

. .................................................................................................................................................... 460

HDLC CONTROL REGISTER (ADDRESS = 0X82) ..................................................................................... 460

8.2 OPERATING THE HIGH SPEED HDLC CONTROLLER ............................................................................................ 460

8.2.1 Operating the Transmit HDLC Controller Block .................................................................................... 461

TABLE 94: DESCRIPTION OF EACH OF THE TRANSMIT HDLC CONTROLLER PINS .................................... 462

Figure 214. A Simple Illustration of an Outbound HDLC Frame, as assembled by the Transmit HDLC Con-

troller, when CRC-32 is selected. ........................................................................................................ 463

Figure 215. A Simple Illustration of an Outbound HDLC Frame, as assembled by the Transmit HDLC Con-

troller, when CRC-16 is selected. ........................................................................................................ 464

8.2.2 Operating the Receive HDLC Controller Block ..................................................................................... 464

TABLE 95: DESCRIPTION OF EACH OF THE RECEIVE HDLC CONTROLLER PINS ...................................... 465

ORDERING INFORMATION ........................................................................................ 466

PACKAGE DIMENSIONS ............................................................................................ 466

REVISION HISTORY ................................................................................................................................ 467

XRT72L56 Datasheet(PDF) 21 Page - Exar Corporation

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