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參數(shù)資料
| 型號： | MB86965A |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP16 |
| 封裝： | PLASTIC, QFP-160 |
| 文件頁數(shù)： | 50/76頁 |
| 文件大小： | 394K |
| 代理商： | MB86965A |
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MB86965
54
Figure 20. Carrier Sense Function
RECEIVE FUNCTION
The Transceiver receive function acquires timing and
data from the twisted-pair network (the TPI circuit) or
from the AUI (the DI circuit). Valid received signals pass
through the on-chip filters and Manchester decoder, and
output as decoded NRZ data and receive timing on the
Receiver Data and Receiver Clock to the Receiver State
Machine. No external filters are required.
An internal intelligent squelch function discriminates
noise from link test pulses and valid data streams. The
receive function is activated only by valid data streams
above the squelch level and with proper timing. If the
differential signal at the TPI or the DI circuit inputs falls
below 75% of the threshold level (unsquelched) for eight
bit times (typical), the receive function enters the idle
state. If polarity of the TPI circuit reverses, the
Transceiver detects the polarity reversal and reports it via
RXI POL REV bit, BMPR15<3>. The Transceiver
automatically corrects reversed polarity. Figure 20 is a
state diagram of the carrier sense function.
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