AT43301 datasheet(18/27 Pages) ATMEL

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1137J–USB–01/06

AT43301

Figure 4-7.

Hub Differential Delay, Differential Jitter, and SOP Distortion

Hub Differential Jitter:

HDJ1 = THDDX(J) - THDDX(K) or THDDX(K) - THDDX(J) Consecutive Transitions

HDJ2 = THDDX(J) - THDDX(J) or THDDX(K) - THDDX(K) Paired Transitions

Bit After Sop Width Distortion (Same as Data Jitter for Sop and Next J Transition):

SOP = THDDX(NEXTJ) - THDDX(SOP)

Low-speed timings are determined in the same way for:

LHDD, TLDHJ1, TLDJH2, TLUHJ1, TLUJH2, and TLSOP

CROSSOVER

POINT

DIFFERENTIAL

DATA LINES

A. DOWNSTREAM HUB DELAY WITH CABLE

50% POINT OF

INITIAL SWING

UPSTREAM

END OF

CABLE

HUB DELAY

DOWNSTREAM

THDD1

CROSSOVER

POINT

DOWNSTREAM

PORT

CROSSOVER

POINT

HUB DELAY

UPSTREAM

THDD2

UPSTREAM

PORT

VSS

B. UPSTREAM HUB DELAY WITHOUT CABLE

CROSSOVER

POINT

DOWNSTREAM

PORT

CROSSOVER

POINT

HUB DELAY

UPSTREAM

THDD1, THDD2

UPSTREAM

PORT OR END

OF CABLE

VSS

C. UPSTREAM HUB DELAY WITH OR WITHOUT CABLE

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