ics1893cy-10 Integrated Device Technology, ics1893cy-10 Datasheet - Page 90

• Manufacturer Part Number: ics1893cy-10
• Description: 3.3-v 10base-t/100base-tx Integrated Phyceiver
• Manufacturer: Integrated Device Technology

7.12.6 False Carrier (bit 17.8)
7.12.7 Invalid Symbol (bit 17.7)
7.12.8 Halt Symbol (bit 17.6)
ICS1893CY-10 Rev 1/07
The False Carrier bit indicates to an STA the detection of a False Carrier by the ICS1893CY-10 in 100Base
mode.
A False Carrier occurs when the ICS1893CY-10 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:
•
•
This bit is a latching high bit. (For more information on latching high and latching low bits, see
7.1.4.1, “Latching High Bits”
Note:
The Invalid Symbol bit indicates to an STA the detection of an Invalid Symbol in a 100Base data stream by
the ICS1893CY-10.
When the ICS1893CY-10 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 ICS1893CY-10 sets its Invalid Symbol bit to logic one. Therefore, if this bit is set to a
logic:
•
•
This bit is a latching high bit. (For more information on latching high and latching low bits, see
7.1.4.1, “Latching High Bits”
Note:
The Halt Symbol bit indicates to an STA the detection of a Halt Symbol in a 100Base data stream by the
ICS1893CY-10.
During reception of a valid packet, the ICS1893CY-10 examines each symbol to ensure that the data being
passed to the MAC/Repeater Interface is error free. In addition, it looks for special symbols such as the Halt
Symbol. If a Halt Symbol is encountered, the ICS1893CY-10 indicates this condition to the MAC/repeater.
If this bit is set to a logic:
•
•
This bit is a latching high bit. (For more information on latching high and latching low bits, see
7.1.4.1, “Latching High Bits”
Note:
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.
Zero, it indicates an Invalid Symbol has not been detected since either the last read or reset of this
register.
One, it indicates an Invalid Symbol was detected since either the last read or reset of this register.
Zero, it indicates a Halt Symbol has not been detected since either the last read or reset of this register.
One, it indicates a Halt Symbol was detected in the packet since either the last read or reset of this
register.
ICS1893CY-10 Data Sheet - Release
This bit has no definition in 10Base-T mode.
This bit has no definition in 10Base-T mode.
This bit has no definition in 10Base-T mode.
Copyright © 2007, Integrated Device Technology, Inc.
and
and
and
Section 7.1.4.2, “Latching Low
Section 7.1.4.2, “Latching Low
Section 7.1.4.2, “Latching Low
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Chapter 7 Management Register Set
Section
Section
Section