ICS1893 Integrated Circuit Systems, ICS1893 Datasheet - Page 98

• Manufacturer Part Number: ICS1893
• Description: 3.3-V 10Base-T/100Base-TX Integrated PHYceiver
• Manufacturer: Integrated Circuit Systems

8.13.2 Polarity Reversed (bit 18.14)
8.13.3 ICS Reserved (bits 18.13:6)
8.13.4 Jabber Inhibit (bit 18.5)
8.13.5 ICS Reserved (bit 18.4)
8.13.6 Auto Polarity Inhibit (bit 18.3)
8.13.7 SQE Test Inhibit (bit 18.2)
ICS1893 Rev C 6/6/00
The Polarity Reversed bit is used to inform an STA whether the ICS1893 has detected that the signals on
the Twisted-Pair Receive Pins (TP_RXP and TP_RXN) are reversed. When the signal polarity is:
•
•
Note:
See
The Jabber Inhibit bit allows an STA to disable Jabber Detection. When an STA sets this bit to:
•
•
See
The Auto Polarity Inhibit bit allows an STA to prevent the automatic correction of a polarity reversal on the
Twisted-Pair Receive pins (TP_RXP and TP_RXN). If an STA sets this bit to logic:
•
•
Note:
The SQE Test Inhibit bit allows an STA to prevent the generation of the Signal Quality Error pulse. When
an STA sets this bit to logic:
•
•
The SQE Test provides the ability to verify that the Collision Logic is active and functional. A 10Base-T
SQE test is performed by pulsing the Collision signal for a short time after each packet transmission
completes, that is, after TXEN goes inactive.
Note:
1. The SQE Test is automatically inhibited in full-duplex and repeater modes, thereby disabling the
2. This bit is a control bit and not a status bit. Therefore, it is not updated to indicate this automatic
Correct, the ICS1893 sets bit 18.14 to a logic zero.
Reversed, the ICS1893 sets bit 18.14 to logic one.
Zero, the ICS1893 enables 10Base-T Jabber checking.
One, the ICS1893 disables its check for a Jabber condition during data transmission.
Zero (the default), the ICS1893 automatically corrects a polarity reversal on the Twisted-Pair Receive
pins.
One, the ICS1893 either disables or inhibits the automatic correction of reversed Twisted-Pair Receive
pins.
Zero, the ICS1893 enables its SQE Test generation.
One, the ICS1893 disables its SQE Test generation.
functionality of this bit.
inhibiting of the SQE test in full-duplex mode or repeater mode.
ICS1893 Data Sheet - Release
Section 8.11.2, “ ICS Reserved (bits 16.14:11)”
Section 8.11.2, “ ICS Reserved (bits 16.14:11)”
The ICS1893 can detect this situation and perform all its operations normally, independent of the
reversal.
This bit is also used to correct a reversed signal polarity for 100Base-TX operations.
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
98
, the text for which also applies here.
, the text for which also applies here.
Chapter 8 Management Register Set
June, 2000