XRT7250 datasheet(77/463 Pages) EXAR

77 / 463 page

XRT7250

DS3/E3 FRAMER IC

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REV. 1.1.1

Setting this bit-field to "1" configures the XRT7250 to

output data, via the TxPOS and TxNEG output pins,

on the falling edge of TxLineClk.

Bit 1 - RxLineClk Invert

This Read/Write bit-field permits the user to configure

the XRT7250 to latch data on the RxPOS and Rx-

NEG input pins, into the XRT7250, on the rising or

falling edge of RxLineClk.

Setting this bit-field to "0" configures the XRT7250 to

latch the data on the RxPOS and RxNEG input pins,

into the device, on the rising edge of RxLineClk.

Setting this bit-field to "1" configures the XRT7250 to

latch the data on the RxPOS and RxNEG input pins,

into the device, data, on the falling edge of RxLineClk.

Bit 0 - Reframe

This Read/Write bit-field permits the user to configure

the Receive Section of the XRT7250 to start a new

frame search. A "0" to "1" transition, in this bit-field

will force the chip to start a new frame search.

2.3.2.3

Part Number Register

2.3.2.4

Version Number Register

2.3.2.5

Block Interrupt Enable Register

Bit 7 - RxDS3/E3 Interrupt Enable

This Read/Write bit-field permits the user to enable or

disable all Receive Section related interrupts (within

the XRT7250), at the Block Level.

Setting this bit-field to "0" disables all Receive Section

related Interrupts within the XRT7250.

Setting this bit-field to "1" enables the Receive Sec-

tion related Interrupts (within the XRT7250) at the

block level.

NOTE: Setting this bit-field to "1" does not enable all

Receive Section related Interrupts. Each of these interrupts

can still be disabled at the Source Level. However, setting

this bit-field to "0" does disable all Receive Section related

Interrupts.

Bit 1 - TxDS3/E3 Interrupt Enable

This Read/Write bit-field permits the user to enable or

disable all Transmit Section related interrupts (within

the XRT7250), at the Block Level.

Setting this bit-field to "0" disables all Transmit Sec-

tion related Interrupts within the XRT7250.

PART NUMBER REGISTER (ADDRESS = 0X02)

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

Part Number Value

00000011

VERSION NUMBER REGISTER (ADDRESS = 0X03)

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

Version Number Value

00000001

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

000

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