XRT7250 datasheet(288/463 Pages) EXAR

288 / 463 page

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XRT7250

DS3/E3 FRAMER IC

REV. 1.1.1

269

This action will prevent the LAPD Transmitter from

generating its own One-Second interrupt (following

each transmission of the LAPD Message frame).

2. Enable the One-Second Interrupt

This can be done by writing a “1” into Bit 0 (One-Sec-

ond Interrupt Enable) within the Block Interrupt En-

able Register, as depicted below.

3. Write the new message into the Transmit LAPD

Message buffer immediately after the occurrence

of the One-Second Interrupt

By synchronizing the writes to the Transmit LAPD

Message buffer to occur immediately after the occur-

rence of the One-Second Interrupt, the user avoids

conflicting with the One-Second transmission of the

LAPD Message frame, and will transmit the correct

(uncorrupted) PMDL Message to the Remote LAPD

Receiver.

FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Local Loopback

DS3/E3*

Internal

LOS

Enable

RESET

Interrupt

Enable Reset

Frame Format

TimRefSel[1:0]

R/W

BLOCK INTERRUPT ENABLE REGISTER (ADDRESS = 0X04)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

RxDS3/E3

Interrupt

Enable

Not Used

TxDS3/E3

Interrupt

Enable

One-Second

Interrupt

Enable

R/W

RORO

R/W

0000

000

XRT7250 Datasheet(PDF) 288 Page - Exar Corporation

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