参数资料
型号: WJLXT971ALC.A4SE001
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封装: LEAD FREE, LQFP-64
文件页数: 48/116页
文件大小: 1172K
代理商: WJLXT971ALC.A4SE001
LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
Datasheet
37
Document #: 249414
Revision #: 002
Rev. Date: August 7, 2002
As shown in Figure 14 on page 36, the MAC starts each transmission with a preamble pattern. As
soon as the LXT971A detects the start of preamble, it transmits a Start-of-Stream Delimiter (SSD,
symbols J and K) to the network. It then encodes and transmits the rest of the packet, including the
balance of the preamble, the SFD, packet data, and CRC.
Once the packet ends, the LXT971A transmits the End-of- Stream Delimiter (ESD, symbols T and
R) and then returns to transmitting Idle symbols. 4B/5B coding is shown in Table 11 on page 40.
Figure 16 shows normal reception with no errors. When the LXT971A receives invalid symbols
from the line, it asserts RX_ER as shown in Figure 17.
Figure 15. 100BASE-TX Data Path
S0
S1
S2
S3
S4
Parallel
to
Serial
to
Parallel
MLT3
0
+1
-1
00
Transition = 1.
No Transition = 0.
All transitions must follow
pattern: 0, +1, 0, -1, 0, +1...
Scrambler Bypass Data Flow
S0 S1 S2 S3 S4
Standard Data Flow
D0
D1
D2
D3
Parallel
to
Serial
to
Parallel
D0 D1 D2 D3
4B/5B
S0 S1 S2 S3 S4
MLT3
0
+1
-1
00
Transition = 1.
No Transition = 0.
All transitions must follow
pattern: 0, +1, 0, -1, 0, +1...
Scramble
De-
Scramble
Figure 16. 100BASE-TX Reception with No Errors
Figure 17. 100BASE-TX Reception with Invalid Symbol
RX_CLK
RX_DV
RXD<3:0>
RX_ER
preamble SFD SFD DA
DA
CRC
RX_CLK
RX_DV
RXD<3:0>
RX_ER
preamble SFD SFD DA
DA
XX
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