DSP56857 datasheet(250/662 Pages) FREESCALE

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Functional Description

5685X Digital Signal Controller User Manual, Rev. 4

10-14

Freescale Semiconductor

Figure 10-7. Start Bit Search Example 1

Figure 10-8 shows noise is perceived as the beginning of a Start bit although the verification

sample at RT3 is high. The RT3 sample sets the Noise Flag. Although the perceived bit time is

misaligned, the data samples RT8, RT9, and RT10 are within the bit time and data recovery is

successful.

Figure 10-8. Start Bit Search Example 2

Figure 10-9 illustrates a large burst of noise is perceived as the beginning of a Start bit, although

the test sample at RT5 is high. The RT5 sample sets the Noise Flag. Although this is a worst-case

misalignment of perceived bit time, the data samples RT8, RT9, and RT10 are within the bit time

and data recovery is successful.

RESET RT CLOCK

SAMPLES

RT CLOCK

RT CLOCK COUNT

START BIT

RXD

LSB

RESET RT CLOCK

SAMPLES

RT CLOCK

RT CLOCK COUNT

ACTUAL START BIT

RXD

LSB

PERCEIVED START BIT

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