ICS1892 Datasheet, PDF (92/148 Pages) Integrated Circuit Systems – 10Base-T/100Base-TX Integrated PHYceiver

ICS1892 Data Sheet
Chapter 8 Management Register Set
8.12.5 PLL Lock Error (bit 17.9)
The Phase Locked Loop (PLL) Lock Error bit indicates to an STA whether the ICS1892 has ever
experienced a PLL Lock Error. A PLL Lock Error occurs when a 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 the last read of this register.
• One, it indicates that a PLL Lock Error has occurred after the last read 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 ICS1892 in 100Base mode.
A False Carrier occurs when the ICS1892 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 that a False Carrier has not been detected since the last read of this register.
• One, it indicates that a False Carrier was detected since the last read 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 ICS1892.
During reception of a valid packet, the ICS1892 examines each Symbol to ensure that the data being
passed to the MAC/Repeater Interface is error free. If an error occurs, the ICS1892 indicates this condition
to the MAC/repeater. An Invalid Symbol occurs when the ICS1892 evaluates a valid packet and finds an
Invalid Symbol in the data.
If this bit is set to a logic:
• Zero, it indicates an Invalid Symbol has not been detected since the last read of this register.
• One, it indicates an Invalid Symbol was detected since the last read 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.
ICS1892, Rev. D, 2/26/01
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
92
February 26, 2001