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參數(shù)資料
| 型號(hào)： | L80600 |
| 英文描述： | L80600 10/100/1000 Mbits/s Ethernet PHY technical manual 3/01 |
| 中文描述： | L80600 10/100/1000 Mbits /秒以太網(wǎng)PHY技術(shù)手冊(cè)3月1日 |
| 文件頁(yè)數(shù)： | 41/192頁(yè) |
| 文件大?。?/td> | 1344K |
| 代理商： | L80600 |
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Clock Recovery Module
2-27
5B code-group data (5 bits). Code-group alignment occurs after the J/K
code-group pair is detected. Once the J/K code-group pair
(0b11000 10001) is detected, subsequent data is aligned on a fixed
boundary.
2.7.4 4B/5B Decoder
The code-group decoder functions as a lookup table that translates
incoming 5B code-groups into 4B nibbles. The code-group decoder first
detects the J/K code-group pair preceded by IDLE code-groups and
replaces the J/K with MAC preamble. Specifically, the J/K 10-bit
code-group pair is replaced by the nibble pair (0b0101 0b0101). All
subsequent 5B code-groups are converted to the corresponding 4B
nibbles for the duration of the entire packet. This conversion ceases upon
the detection of the T/R code-group pair denoting the End of Stream
Delimiter (ESD) or with the reception of a minimum of two IDLE
code-groups.
2.7.5 100BASE-X Link Integrity Monitor
The 100BASE-X Link monitor ensures that a valid and stable link is
established before enabling both the Transmit and Receive PCS layer.
Signal Detect must be valid for at least 500
μ
s to allow the link monitor
to enter the “Link Up” state, and enable transmit and receive functions.
Signal detect can be forced active by setting Bit 4 of the ECTRL1 register
0x10. Additionally, Signal Detect can be AND’ed with the descrambler
locked indication by setting Bit 3 of the EXTRL1 register. With bit 3 set,
the descrambler “Locked” is required to enter the Link Up state, but only
Signal Detect is required to maintain the link in the Link Up state.
2.7.6 Bad SSD Detection
A Bad Start of Stream Delimiter (Bad SSD) is any transition from
consecutive idle code-groups to nonidle code-groups that is not prefixed
by the code-group pair /J/K.
If this condition is detected, the L80600 asserts RX_ER and presents
RXD[3:0] = 0b1110 to the MII for the cycles that correspond to received
5B code-groups until at least two IDLE code groups are detected.
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