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參數(shù)資料
| 型號： | GL600USB-A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | USB MOUSE MICROCONTROLLER |
| 中文描述： | USB鼠標(biāo)單片機 |
| 文件頁數(shù)： | 21/38頁 |
| 文件大小： | 352K |
| 代理商： | GL600USB-A |
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21
06/19/2000
GL600USB/GL600USB-A/GL600USB-B
Revision 1.3
The data receivers for all types of devices must be able to properly decode the differential data in the
presence of jitter. The more of the bit time that any data edge can occupy and still be decoded, the more
reliable the data transfer will be. Data receivers are required to decode differential data transitions that
occur in a window plus and minus a nominal quarter bit time from the nominal (centered) data edge
position. Jitter will be caused by the delay mismatches and by mismatches in the source and destination
data rates (frequencies).
Differential
Data Lines
Paired
Transitions
N * T
PERIOD
+ T
JR2
T
PERIOD
Consecutive
Transitions
N * T
PERIOD
+ T
JR1
T
JR
T
JR1
T
JR2
Figure 4-4 Receiver Jitter Tolerance
The source of data can have some variation (jitter) in the timing of edges of the data transmitted. The time
between any set of data transitions is N*T
Period
±
jitter time, where N is the number of bits between the
transitions and T
Period
is defined as the actual period of the data rate. The data jitter is measured with the
same capacitive load used for maximum rise and fall times and is measured at the crossover points of the
data lines.
For low-speed transmissions, the jitter time for any consecutive differential data transitions must be within
±
25ns and within
±
10ns for any set of paired differential data transitions. These jitter numbers include
timing variations due to differential buffer delay, rise/fall time mismatches, internal clock source jitter,
noise and other random effects.
The output rise time and fall time are measured between 10% and 90% of the signal. Edge transition time
for the rising and falling edges of low-speed signals is 75ns (minimum) into a capacitive load (C
L
) of 50pF
and 300ns (maximum) into a capacitive load of 350pF. The rising and falling edges should be transitioning
(monotonic) smoothly when driving the cable to avoid excessive EMI.
Low Speed: 75ns at C
L
= 50pF, 300ns at C
L
= 350pF
Full Speed: 4 to 20ns at C
L
= 50pF
Differential
Data Lines
10%
Rise Time
90%
Fall Time
t
F
t
R
10%
90%
C
L
C
L
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GL600USB-B | USB MOUSE MICROCONTROLLER |
| GL620USB | GeneLink-Lite USB PC-to-PC File Transfer Controller |
| GL641USB | USB ATA/ATAPI/ COMPACT FLASH CARD CONTROLLER |
| GL650USB | USB 4 PORT HUB CONTROLLER |
| GL651USB | 2-PORT USB KEYBOARD HUB CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GL600USB-B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:USB MOUSE MICROCONTROLLER |
| GL60209 | 制造商:Glenair Inc 功能描述:CONNECTOR - Bulk |
| GL602USB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:USB KEYBOARD MICROCONTROLLER |
| GL602USB-A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:USB KEYBOARD MICROCONTROLLER |
| GL603USB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:USB + PS/2 MOUSE MICROCONTROLLER |
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