XRT79L71 datasheet(73/441 Pages) EXAR

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PRELIMINARY

XRT79L71

1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

REV. P1.0.3

RECEIVE UTOPIA INTERFACE

The purpose of the Receive UTOPIA Interface block is to function as either a Standard UTOPIA Level 1, 2 or 3

Interface as it outputs ATM cell data to either an ATM Layer or ATM Adaptation Layer Processor.

FIGURE 23. TIMING DIAGRAM FOR THE RECEIVE UTOPIA INTERFACE BLOCK

TABLE 14: TIMING INFORMATION FOR THE RECEIVE UTOPIA INTERFACE BLOCK

Symbol

PARAMETER

MIN.TYP

MAX.UNITS

Receive UTOPIA Interface Block (See Figure 22)

t53

Delay time from rising edge of RxUClk to Data Valid at RxU-

Data[15:0]

2.7

t54

Rx UTOPIA Read Enable setup time to rising edge of RxUClk

t55

Delay time from rising edge of RxUClk to valid RxUPrty bit

2.9

9.8

t56

Delay time from rising edge of RxUClk to valid RxUSoC bit

3.5

9.7

t57

Delay time from Read Enable false to Data Bus being tri-stated

11.5

t58

Delay time from Read Enable false to RxUPrty bit being tri-

stated

112

RxUData[15:0]

RxUEn*

RxUPrty

RxUSoC

RxUClk

t54

t57

RxUClav

t62

t63

t53

DATA VALID

t55

t58

t59

t56

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