XRT7250 datasheet(378/463 Pages) EXAR

378 / 463 page

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XRT7250

DS3/E3 FRAMER IC

REV. 1.1.1

359

3. After the Terminal Equipment has waited the

appropriate number of clock edges (from the

TxOHFrame signal being sampled "High"), it

should assert the TxOHIns input signal. Concur-

rently, the Terminal Equipment should also place

the appropriate value (of the inserted overhead

bit) onto the TxOH signal.

4. The Terminal Equipment should hold both the

TxOHIns input pin "High" and the value of the

TxOH signal, stable until the next rising edge of

TxOHClk is detected.

Case Study: The Terminal Equipment intends to

insert the appropriate overhead bits into the

Transmit Overhead Data Input Interface (using

TR Byte - Bit 1

Yes

TR Byte - Bit 0

Yes

MA Byte - Bit 7

Yes (FERF Bit)

MA Byte - Bit 6

Yes (FEBE Bit)

MA Byte - Bit 5

Yes

MA Byte - Bit 4

Yes

MA Byte - Bit 3

Yes

MA Byte - Bit 2

Yes

MA Byte - Bit 1

Yes

MA Byte - Bit 0

Yes

NR Byte - Bit 7

Yes

NR Byte - Bit 6

Yes

NR Byte - Bit 5

Yes

NR Byte - Bit 4

Yes

NR Byte - Bit 3

Yes

NR Byte - Bit 2

Yes

NR Byte - Bit 1

Yes

NR Byte - Bit 0

Yes

GC Byte - Bit 7

Yes

GC Byte - Bit 6

Yes

GC Byte - Bit 5

Yes

GC Byte - Bit 4

Yes

GC Byte - Bit 3

Yes

GC Byte - Bit 2

Yes

GC Byte - Bit 1

Yes

GC Byte - Bit 0

Yes

TABLE 73: THE RELATIONSHIP BETWEEN THE NUMBER OF RISING CLOCK EDGES IN TXOHCLK, (SINCE

"TXOHFRAME" WAS LAST SAMPLED "HIGH") TO THE E3 OVERHEAD BIT, THAT IS BEING PROCESSED

NUMBER OF RISING CLOCK EDGES IN

TXOHCLK

THE OVERHEAD BIT EXPECTED BY THE

"XRT7250"

CAN THIS OVERHEAD BIT BE ACCEPTED BY

THE

XRT7250?

XRT7250 Datasheet(PDF) 378 Page - Exar Corporation

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