AT43301 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT43301

Low-cost USB Hub Controller

Atmel Corporation 

Figure 4-7. Hub Differential Delay, Differential Jitter, and SOP Distortion

UPSTREAM

END OF

CABLE

VSS

50% POINT OF

INITIAL SWING

DOWNSTREAM

PORT

VSS

CROSSOVER

POINT

DIFFERENTIAL

DATA LINES

VSS

HUB DELAY

DOWNSTREAM

THDD1

CROSSOVER

POINT

A. DOWNSTREAM HUB DELAY WITH CABLE

UPSTREAM

PORT

VSS

HUB DELAY

UPSTREAM

THDD2

CROSSOVER

POINT

B. UPSTREAM HUB DELAY WITHOUT CABLE

DOWNSTREAM

PORT

CROSSOVER

POINT

VSS

UPSTREAM

PORT OR END

OF CABLE

VSS

HUB DELAY

UPSTREAM

THDD1, THDD2

CROSSOVER

POINT

C. UPSTREAM HUB DELAY WITH OR WITHOUT CABLE

Hub Differential Jitter:

THDJ1 = THDDX(J) - THDDX(K) or THDDX(K) - THDDX(J) Consecutive Transitions

THDJ2 = 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):

TSOP = THDDX(NEXTJ) - THDDX(SOP)

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

TLHDD, TLDHJ1, TLDJH2, TLUHJ1, TLUJH2, and TLSOP

18 AT43301

1137J–USB–01/06

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