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參數(shù)資料
| 型號： | DM9801A |
| 文件頁數(shù)： | 43/60頁 |
| 文件大小： | 605K |
| 代理商： | DM9801A |
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DM9801A
1M Home Phoneline Network Physical Layer Single Chip Transceiver
Final
Version: DM9801A-DS-F01
May 30, 2001
43
DM9801A 1M Framing
Figure 21
DM9801A Symbol Waveform
All DM9801A symbols are composed at the transmitter of
a silence interval and a pulse formed of an integer number
of cycles (CYCLES_PER_PULSE) of a frequency square
wave (CENTER_FREQUENCY) that has been filtered
with a bandpass filter. Data is encoded in the same time
interval from the preceding pulse.
The DM9801A pulse parameters are shown below.
Parameter
Value
Tolerance
Unit
CENTER_FREQUENCY
7.5
500 PPM
MHz
CYCLES_PER_PULSE
4
Cycle
DM9801A 1M time intervals are expressed in Tine Interval
Clock (TIC) units. One TIC is defined as 7/(60E6) seconds
or approximately 116.67 nano-seconds (ns).
Access ID Intervals
The DM9801A 1M frame begins with an Access ID
interval which is composed of eight equally spaced
subintervals termed AID symbols 0 through 7. (refer to
figure 21 above)
An Access ID symbol is 129 TICs long. Transmit timing is
shown in figure 22 below. Timing starts at the beginning of
each AID symbol and ends at TIC = 129.
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相關(guān)代理商/技術(shù)參數(shù) |
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