參數(shù)資料
型號(hào)： DM9161
廠商： Electronic Theatre Controls, Inc.
英文描述： 10/100 Mbps FAST ETHERNET PHYSICAL LAYER SINGLE CHIP TRANSCEIVER
中文描述： 10/100 Mbps快速以太網(wǎng)物理層單芯片收發(fā)器
文件頁(yè)數(shù)： 17/47頁(yè)
文件大?。?/td> 561K
代理商： DM9161
DM9161
10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver
Final 17
Version: DM9161-DS-F02
May 10,2002
Figure 7-4
7.2.2 100Base-TX Receiver
The 100Base-TX receiver contains several function blocks
that convert the scrambled 125Mb/s serial data to
synchronous 4-bit nibble data, which is then provided to the
MII.
The receive section contains the following functional blocks:
- Signal Detect
- Adaptive Equalizer
- MLT-3 to NRZI Decoder
- Clock Recovery Module
- NRZI to NRZ Decoder
- Serial to Parallel
- Descrambler
- Code Group Alignment
- 4B5B Decoder
7.2.2.1 Signal Detect
The signal detect function meets the specifications
mandated by the ANSI XT12 TP-PMD 100Base-TX
Standards for both voltage thresholds and timing
parameters.
7.2.2.2 Adaptive Equalizer
When transmitting data at high speeds over copper twisted
pair cable, attenuation based on frequency becomes a
concern. In high speed twisted pair signaling, the frequency
content of the transmitted signal can vary greatly during
normal operation based on the randomness of the
scrambled data stream. This variation in signal attenuation
caused by frequency variations must be compensated for to
ensure the integrity of the received data. In order to ensure
quality transmission when employing MLT-3 encoding, the
compensation must be able to adapt to various cable lengths
and cable types depending on the installed environment. The
selection of long cable lengths for a given implementation
requires significant compensation, which will be over-kill in a
situation that includes shorter, less attenuating cable lengths.
Conversely, the selection of short or intermediate cable
lengths requiring less compensation will cause serious
under-compensation for longer length cables. Therefore, the
compensation or equalization must be adaptive to ensure
proper conditioning of the received signal independent of the
cable length.
7.2.2.3 MLT-3 to NRZI Decoder
The DM9161 decodes the MLT-3 information from the
Digital Adaptive Equalizer into NRZI data. The relation
between NRZI and MLT-3 data is shown in figure 7-4.
D
CK
Q
Q
.
.
Binary
In
Common
driver
Binary minus
Binary plus
MLT-3
MLT-3
Binary
In
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