SLXT970AQC.B11-831643 Cortina Systems Inc, SLXT970AQC.B11-831643 Datasheet - Page 36

• Manufacturer Part Number: SLXT970AQC.B11-831643
• Manufacturer: Cortina Systems Inc

Specifications of SLXT970AQC.B11-831643

• Number Of Receivers: 1
• Data Rate: 10/100Mbps
• Operating Supply Voltage (typ): 5V
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• Mounting: Surface Mount
• Pin Count: 64
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Lead Free Status / RoHS Status: Not Compliant

Intel
2.8.1.1
2.8.1.2
2.8.1.3
36
Figure 15. Protocol Sublayers
®
LXT970A Dual-Speed Fast Ethernet Transceiver
100X Preamble Handling
When the MAC asserts TX_EN, the PCS substitutes a /J/K symbol pair, also known as the Start of
Stream Delimiter or SSD, for the first two nibbles received across the MII. The PCS layer
continues to encode the remaining MII data, following
then returns to supplying IDLE symbols to the line driver.
In the receive direction, the PCS layer performs the opposite function, substituting two preamble
nibbles for the SSD.
10T Preamble Handling
In 10BASE-T Mode, the LXT970A Transceiver strips the entire preamble off of received packets.
CRS is asserted a few bit times after carrier is detected. RX_DV is held for the duration of the
preamble.
When RX_DV is asserted, the very first two nibbles driven by the LXT970A Transceiver are the
SFD “5D” hex followed by the body of the packet. In 10T loopback, the LXT970A Transceiver
loops back whatever the MAC transmits to it, including the preamble.
Data Errors (100X Only)
Figure 16
the line, it asserts RX_ER, as shown in
Layer
Layer
Layer
PMA
PMD
PCS
shows normal reception. When the LXT970A Transceiver receives invalid symbols from
LXT970A
Scrambler/De-
scrambler
100BASETX
Serializer/De-serializer
Link/Carrier Detect
Encoder/Decoder
Figure
17.
MII Interface
Fiber Transceiver
Table
100BASE-FX
PECL Interface
17, until TX_EN is de-asserted. It
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