SLXT970AQC.B11-831643 Cortina Systems Inc, SLXT970AQC.B11-831643 Datasheet - Page 38

• 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
2.8.1.5
2.8.1.6
2.8.2
2.8.2.1
2.8.2.2
38
®
LXT970A Dual-Speed Fast Ethernet Transceiver
SQE (10T Only)
When the SQE (heartbeat) function is enabled, the LXT970A Transceiver asserts its COL output
for 5-15 BT after each packet. By default, the SQE function is disabled on the
LXT970A Transceiver. To enable SQE, set bit 19.10 = 1. See
parameters.
Jabber (10T Only)
If the MAC transmission exceeds the jabber timer, the LXT970A Transceiver disables the transmit
and loopback functions and asserts the COL pin. The LXT970A Transceiver automatically exits
jabber mode after 250-750 ms. This function can be disabled by setting bit 19.9 = 1. See
on page 59
PMA Layer
The Physical Medium Attachment (PMA) layer provides link and carrier status functions.
100TX Link Options
The LXT970A Transceiver uses standard symbol error rate criteria to establish a link and has two
options for 100TX and 100FX applications to break down a link:
Standard link criteria (17.2 = 0 default), takes down the link when the Bit Error Rate (BER)
exceeds the allowable standards. If the link goes down and auto-negotiation is enabled, the device
automatically restarts the auto-negotiation process. Otherwise the device continues to monitor the
line for a valid link. With this option both link up and link loss are based on symbol error rate.
Enhanced link-loss criteria (17.2 = 1) works independent of symbol error rate. The loss of
scrambler lock for more than 1 - 2 msec brings the link down. Enhanced link-loss criteria is not
available in 5B mode.
10T Link Test
For 10T operation, link is detected via Normal Link Pulses (NLPs). In 10T mode, the
LXT970A Transceiver always transmits link pulses. If the Link Test Function is enabled, it
monitors the connection for link pulses. Once it detects 2 to 7 link pulses, data transmission will
be enabled and remains enabled as long as the link pulses or data transmission continues. Link
failure occurs if Link Test is enabled and link pulses are no longer received. When this condition
occurs, the LXT970A Transceiver returns to the auto-negotiation phase if auto-negotiation is
enabled. If the Link Test function is disabled, the LXT970A Transceiver transmits to the
connection regardless of detected link pulses. The Link Test function can be disabled by setting bit
19.8 = 1 or by setting MF0 to disable auto-negotiation and setting CFG1 input High.
•
•
Standard (symbol error rate).
Enhanced (scrambler lock).
for Jabber timing parameters.
Figure 30 on page 59
for SQE timing
Datasheet
Figure 31