Datasheet

78Q2120C
10/100BASE-TX
Transceiver
Page: 15 of 35 © 2009 Teridian Semiconductor Corporation Rev 1.3
MR5: Auto-Negotiation Link Partner Ability Register
BIT SYMBOL TYPE DEFAULT DESCRIPTION
5.15 NP R 0
Next Page: When ‘1’ is read, it indicates the link partner wishes to
engage in Next Page exchange.
5.14 ACK R 0
Acknowledge: When ‘1’ is read, it indicates the link partner has
successfully received at least 3 consecutive and consistent FLP
bursts.
5.13 RF R 0
Remote Fault: When ‘1’ is read, it indicates the link partner has a
fault.
5.12:5 A7:0 R 0
Technology Ability Field: This field contains the technology ability of
the link partner. The bit definition is the same as MR4.12:5.
5.4:0 S4:0 R 00h
Selector Field: This field contains the type of message sent by the
link partner. For IEEE 802.3 compliant link partner, this field should
be ‘00001’.
MR6: Auto-Negotiation Expansion Register
BIT SYMBOL TYPE DEFAULT DESCRIPTION
6.15:5 RSVD R 0
Reserved
6.4 PDF RC 0
Parallel Detection Fault: When ‘1’ is read, it indicates that more than
one technology has been detected during link up. This bit is cleared
when read.
6.3 LPNPA R 0
Link Partner Next Page Able: When ‘1’ is read, it indicates the link
partner supports the Next Page function.
6.2 NPA R 0
Next Page Able: Reads ‘0’ since the 78Q2120C does not support
Next Page function.
6.1 PRX RC 0
Page Received: Reads ‘1’ when a new link code word has been
received into the Auto-Negotiation Link Partner Ability Register. This
bit is cleared upon read.
6.0 LPANEG
A
R 0
Link Partner Auto-Negotiation Able: When ‘1’ is read, it indicates the
link partner is able to participate in the Auto-Negotiation function.