ICS1893BY-10 - Release
Chapter 7 Management Register Set
7.13.2 Polarity Reversed (bit 18.14)
The Polarity Reversed bit is used to inform an STA whether the ICS1893BY-10 has detected that the
signals on the Twisted-Pair Receive Pins (TP_RXP and TP_RXN) are reversed. When the signal polarity
is:
• Correct, the ICS1893BY-10 sets bit 18.14 to a logic zero.
• Reversed, the ICS1893BY-10 sets bit 18.14 to logic one.
Note: The ICS1893BY-10 can detect this situation and perform all its operations normally, independent of
the reversal.
7.13.3 ICS Reserved (bits 18.13:6)
See Section 7.11.2, “ICS Reserved (bits 16.14:11)”, the text for which also applies here.
7.13.4 Jabber Inhibit (bit 18.5)
The Jabber Inhibit bit allows an STA to disable Jabber Detection. When an STA sets this bit to:
• Zero, the ICS1893BY-10 enables 10Base-T Jabber checking.
• One, the ICS1893BY-10 disables its check for a Jabber condition during data transmission.
7.13.5 ICS Reserved (bit 18.4)
See Section 7.11.2, “ICS Reserved (bits 16.14:11)”, the text for which also applies here.
7.13.6 Auto Polarity Inhibit (bit 18.3)
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:
• Zero (the default), the ICS1893BY-10 automatically corrects a polarity reversal on the Twisted-Pair
Receive pins.
• One, the ICS1893BY-10 either disables or inhibits the automatic correction of reversed Twisted-Pair
Receive pins.
Note: The ICS1893BY-10 will not complete the Auto-MDIX function for an inverted polarity cable.
This is a rare event with modern manufactured cables. Full Auto-Negotiation and Auto
Polarity Correction will complete when the Auto-MDIX function is disabled. Software control
for the Auto-MDIX function is available in MDIO Register 19 Bits 9:8.
ICS1893BY-10 Rev A 3/24/04
March, 2004
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
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ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
