AT43301_05 ATMEL [ATMEL Corporation], AT43301_05 Datasheet - Page 18

• Manufacturer Part Number: AT43301_05
• Description: Low-cost USB Hub Controller
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 4-7.
Hub Differential Jitter:
T
T
Bit After Sop Width Distortion (Same as Data Jitter for Sop and Next J Transition):
T
Low-speed timings are determined in the same way for:
T
18
HDJ1
HDJ2
SOP
LHDD
= T
, T
= T
= T
DIFFERENTIAL
LDHJ1
HDDX
HDDX
HDDX
AT43301
UPSTREAM
DATA LINES
(NEXTJ) - T
, T
(J) - T
(J) - T
Hub Differential Delay, Differential Jitter, and SOP Distortion
END OF
CABLE
LDJH2
A. DOWNSTREAM HUB DELAY WITH CABLE
V
V
HDDX
HDDX
SS
SS
, T
LUHJ1
(K) or T
(J) or T
HDDX
, T
(SOP)
DOWNSTREAM
LUJH2
HUB DELAY
HDDX
HDDX
INITIAL SWING
50% POINT OF
T
C. UPSTREAM HUB DELAY WITH OR WITHOUT CABLE
HDD1
, and T
DOWNSTREAM
(K) - T
(K) - T
PORT OR END
UPSTREAM
OF CABLE
HDDX
HDDX
LSOP
PORT
(K) Paired Transitions
(J) Consecutive Transitions
CROSSOVER
V
V
SS
SS
POINT
CROSSOVER
T
HUB DELAY
UPSTREAM
HDD1,
POINT
DOWNSTREAM
B. UPSTREAM HUB DELAY WITHOUT CABLE
T
UPSTREAM
HDD2
PORT
PORT
V
V
CROSSOVER
SS
SS
POINT
CROSSOVER
HUB DELAY
UPSTREAM
POINT
T
HDD2
CROSSOVER
POINT
1137J–USB–01/06