XRT7250 datasheet(334/463 Pages) EXAR

334 / 463 page

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XRT7250

DS3/E3 FRAMER IC

REV. 1.1.1

315

Figure 148 presents the typical behavior of the Re-

ceive Overhead Data Output Interface block, when

Method 2 is being used to sample the incoming E3

overhead bits.

TABLE 66: THE RELATIONSHIP BETWEEN THE NUMBER OF RXOHENABLE OUTPUT PULSES (SINCE RXOHFRAME WAS

LAST SAMPLED

"HIGH") TO THE E3 OVERHEAD BIT, THAT IS BEING OUTPUT VIA THE RXOH OUTPUT PIN

NUMBER OF RXOHENABLE OUTPUT PULSES

THE OVERHEAD BIT BEING OUTPUT BY THE

XRT7250

0 (Clock edge is coincident with RxOHFrame being detected "High”)

FAS Pattern - Bit 9

FAS Pattern - Bit 8

FAS Pattern - Bit 7

FAS Pattern - Bit 6

FAS Pattern - Bit 5

FAS Pattern - Bit 4

FAS Pattern - Bit 3

FAS Pattern - Bit 2

FAS Pattern - Bit 1

FAS Pattern - Bit 0

A Bit

N Bit

FIGURE 148. ILLUSTRATION OF THE SIGNALS THAT ARE OUTPUT VIA THE RECEIVE OVERHEAD DATA OUTPUT INTER-

FACE BLOCK

(FOR METHOD 2).

RxOutClk

RxOHEnable

RxOHFrame

RxOH

BIP - 4, Bit 0

FAS, Bit 9

FAS, Bit 8

FAS, Bit 7

FAS, Bit 6

Recommended

Sampling

Edges

XRT7250 Datasheet(PDF) 334 Page - Exar Corporation

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