SLXT970AQC.B11-831643 Cortina Systems Inc, SLXT970AQC.B11-831643 Datasheet - Page 24

• 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
2.2.3.3
2.2.3.4
24
Figure 7. Repeater Block Diagram
®
LXT970A Dual-Speed Fast Ethernet Transceiver
Repeater Mode
The LXT970A Transceiver MII normally operates in DTE Mode (19.13 = 0). An alternative
operating mode is available for repeater applications (19.13 = 1).
In Repeater Mode, the Carrier Sense (CRS) and Tri-state (TRSTE) signals request and grant bus
access. The TRSTE pin controls only the receive channel of the MII (RX_DV, RX_ER, RX_CLK,
and RXD).
As shown in
and determine which LXT970A Transceiver drives the MII Data Interface. The RSM is responsible
for enforcing collisions, and ensuring packets are not transmitted to the port they were received
from. This is accomplished by supplying each LXT970A Transceiver with individual TX_EN
outputs. Although repeater operation is half-duplex, the LXT970A Transceiver operates the MII as
a full-duplex interface in Repeater Mode. CRS is generated only on receive and Collision (COL) is
never generated.
Repeater Mode is normally used with Slave Clock Mode (XI = GND and TX_CLK is an input).
MII Management Interface
The LXT970A Transceiver supports the IEEE 802.3 MII Management Interface also known as the
Management Data Input/Output (MDIO) Interface. This interface allows upper-layer devices to
monitor and control the state of the LXT970A Transceiver. MDIO interface consists of a physical
connection, a specific protocol which runs across the connection, and an internal set of addressable
State Machine
Repeater
(RSM)
Figure
7, a central Repeater State Machine (RSM) is required to perform arbitration
Transmit Channel (TXD)
Receive Channel (RXD)
TRSTE
TRSTE
TRSTE
TRSTE
TX_EN
TX_EN
TX_EN
TX_EN
CRS
CRS
CRS
CRS
LXT970A
LXT970A
LXT970A
LXT970A
Datasheet