参数资料
型号: WJLXT971ALC.A4-857344
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封装: 10 X 10 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-64
文件页数: 32/80页
文件大小: 931K
代理商: WJLXT971ALC.A4-857344
Page 38
Cortina Systems LXT972A Single-Port 10/100 Mbps PHY Transceiver
LXT972A PHY
Datasheet
249186, Revision 5.2
13 September 2007
5.7 100 Mbps Operation
5.7.3
100BASE-X Protocol Sublayer Operations
With respect to the 7-layer communications model, the LXT972A PHY is a Physical Layer
1 (PHY) device.
The LXT972A PHY implements the following sublayers of the reference model defined by
the IEEE 802.3 standard, and discussed from the reference model point of view:
Figure 17 shows the LXT972A PHY protocol sublayers.
5.7.3.1
Physical Coding Sublayer
The Physical Coding Sublayer (PCS) provides the MII interface, as well as the 4B/5B
encoding/decoding function.
For 100BASE-TX operation, the PCS layer provides IDLE symbols to the PMD-layer line
driver as long as TX_EN is de-asserted.
5.7.3.1.1
Preamble Handling
When the MAC asserts TX_EN, the PCS substitutes a /J/K symbol pair, also known as the
Start-of-Stream Delimiter (SSD), for the first two nibbles received across the MII. The PCS
layer continues to encode the remaining MII data, following the 4B/5B coding in Table 15,
until TX_EN is de-asserted. It then returns to supplying IDLE symbols to the line driver.
Figure 17
Protocol Sublayers
Encoder /Decoder
Serializer /De-serializer
Link/Carrier Detect
PCS
Sublayer
PMA
Sublayer
MII Interface
LXT97x PHY
100BASE-TX
Scrambler/
De-scrambler
PMD
Sublayer
B3395 -03
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WJLXT971ALE.A4-857343 DATACOM, ETHERNET TRANSCEIVER, PQFP64
WJLXT971ALE.A4-857346 DATACOM, ETHERNET TRANSCEIVER, PQFP64
WJLXT972ALC.A4-857341 DATACOM, ETHERNET TRANSCEIVER, PQFP64
WJLXT972ALC.A4-857345 DATACOM, ETHERNET TRANSCEIVER, PQFP64
WJLXT971ALC.A4SE000 DATACOM, ETHERNET TRANSCEIVER, PQFP64
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