參數(shù)資料
型號(hào): AT43301-AC
廠商: ATMEL CORP
元件分類: 總線控制器
英文描述: Low-cost USB Hub Controller
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP32
封裝: 7 X 7 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, PLASTIC, MS-026BBA, LQFP-32
文件頁數(shù): 18/27頁
文件大?。?/td> 206K
代理商: AT43301-AC
18
1137J–USB–01/06
AT43301
Figure 4-7.
Hub Differential Delay, Differential Jitter, and SOP Distortion
Hub Differential Jitter:
T
HDJ1
= T
HDDX
(J) - T
HDDX
(K) or T
HDDX
(K) - T
HDDX
(J) Consecutive Transitions
T
HDJ2
= T
HDDX
(J) - T
HDDX
(J) or T
HDDX
(K) - T
HDDX
(K) Paired Transitions
Bit After Sop Width Distortion (Same as Data Jitter for Sop and Next J Transition):
T
SOP
= T
HDDX
(NEXTJ) - T
HDDX
(SOP)
Low-speed timings are determined in the same way for:
T
LHDD
, T
LDHJ1
, T
LDJH2
, T
LUHJ1
, T
LUJH2
, and T
LSOP
CROSSOVER
POINT
DIFFERENTIAL
DATA LINES
A. DOWNSTREAM HUB DELAY WITH CABLE
50% POINT OF
INITIAL SWING
UPSTREAM
END OF
CABLE
HUB DELAY
DOWNSTREAM
T
HDD1
CROSSOVER
POINT
DOWNSTREAM
PORT
CROSSOVER
POINT
HUB DELAY
UPSTREAM
T
HDD2
UPSTREAM
PORT
V
SS
V
SS
V
SS
V
SS
B. UPSTREAM HUB DELAY WITHOUT CABLE
CROSSOVER
POINT
DOWNSTREAM
PORT
CROSSOVER
POINT
HUB DELAY
UPSTREAM
T
HDD1,
T
HDD2
UPSTREAM
PORT OR END
OF CABLE
V
SS
V
SS
C. UPSTREAM HUB DELAY WITH OR WITHOUT CABLE
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