ICS1893 datasheet(94/152 Pages) ICST

94 / 152 page

ICS1893 Rev C 6/6/00

June, 2000

Chapter 8

Management Register Set

ICS1893 Data Sheet - Release

8.12.5

100Base PLL Lock Error (bit 17.9)

The Phase-Locked Loop (PLL) Lock Error bit indicates to an STA whether the ICS1893 has ever

experienced a PLL Lock Error. A PLL Lock Error occurs when the PLL fails to lock onto the incoming

100Base data stream. If this bit is set to a logic:

• Zero, it indicates that a PLL Lock Error has not occurred since either the last read or reset of this register.

• One, it indicates that a PLL Lock Error has occurred since either the last read or reset of this register.

This bit is a latching high bit. (For more information on latching high and latching low bits, see Section

8.1.4.1, “Latching High Bits”and Section 8.1.4.2, “Latching Low Bits”.)

Note:

This bit has no definition in 10Base-T mode.

8.12.6

False Carrier (bit 17.8)

The False Carrier bit indicates to an STA the detection of a False Carrier by the ICS1893 in 100Base mode.

A False Carrier occurs when the ICS1893 begins evaluating potential data on the incoming 100Base data

stream, only to learn that it was not a valid /J/K/. If this bit is set to a logic:

• Zero, it indicates a False Carrier has not been detected since either the last read or reset of this register.

• One, it indicates a False Carrier was detected since either the last read or reset of this register.

This bit is a latching high bit. (For more information on latching high and latching low bits, see Section

8.1.4.1, “Latching High Bits”and Section 8.1.4.2, “Latching Low Bits”.)

Note:

This bit has no definition in 10Base-T mode.

8.12.7

Invalid Symbol (bit 17.7)

The Invalid Symbol bit indicates to an STA the detection of an Invalid Symbol in a 100Base data stream by

the ICS1893.

When the ICS1893 is receiving a packet, it examines each received Symbol to ensure the data is error free.

If an error occurs, the port indicates this condition to the MAC/repeater by asserting the RXER signal. In

addition, the ICS1893 sets its Invalid Symbol bit to logic one. Therefore, if this bit is set to a logic:

• Zero, it indicates an Invalid Symbol has not been detected since either the last read or reset of this

• One, it indicates an Invalid Symbol was detected since either the last read or reset of this register.

This bit is a latching high bit. (For more information on latching high and latching low bits, see Section

8.1.4.1, “Latching High Bits”and Section 8.1.4.2, “Latching Low Bits”.)

Note:

This bit has no definition in 10Base-T mode.

ICS1893 Datasheet(PDF) 94 Page - Integrated Circuit Systems