SLXT970AQC.B11-831643 Cortina Systems Inc, SLXT970AQC.B11-831643 Datasheet - Page 35

• 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

2.7
2.7.1
2.7.2
2.8
2.8.1
Datasheet
10BASE-T Operation
10BASE-T MII Operations
The MAC transmits data to the LXT970A Transceiver over the MII interface. The
LXT970A Transceiver converts the digital data from the MAC into an analog waveform that is
transmitted to the network via the copper interface. The LXT970A Transceiver converts analog
signals received from the network into a digital format suitable for the MAC. The
LXT970A Transceiver sends the received data to the MAC via the MII. The 5-bit symbol code is
not used for 10BASE-T operation. The MII operates only as a 4-bit interface and the RXD4 &
TXD4 lines are not used.
10BASE-T Network Operations
During 10BASE-T operation, the LXT970A Transceiver transmits and receives Manchester-
encoded data across the network link. When the MAC is not actively transmitting data, the
LXT970A Transceiver sends out link pulses on the line.
In 10BASE-T mode, the polynomial scrambler/descrambler is inactive. Manchester-encoded
signals received from the network are decoded by the LXT970A Transceiver and sent across the
MII to the MAC.
The LXT970A Transceiver does not support fiber connections at 10 Mbps.
Protocol Sublayer Operations
With respect to the 7-layer communications model, the LXT970A Transceiver is a Physical Layer
1 (PHY) device. The LXT970A Transceiver implements the Physical Coding Sublayer (PCS),
Physical Medium Attachment (PMA), and Physical Medium Dependent (PMD) sublayers of the
reference model defined by the IEEE 802.3u specification. The following paragraphs discuss
LXT970A Transceiver operation from the reference model point of view.
PCS Sublayer
The Physical Coding Sublayer (PCS) provides the MII interface, as well as the 4B/5B encoding/
decoding function when the MII is operating as a 4B interface.
For 100TX and 100FX operation, the PCS layer provides IDLE symbols to the PMD-layer line
driver as long as TX_EN is de-asserted.
When the MII is operating in 5B mode, the encoder/decoder function is disabled, and symbol data
presented at the MII is transparently passed downstream, and vice versa.
For 10T operation, the PCS layer merely provides a bus interface and serialization/de-serialization
function. 10T operation does not use the 4B/5B encoder, and is not supported when the MII is in
5B mode.
Intel
®
LXT970A Dual-Speed Fast Ethernet Transceiver
35