MC9S12NE64V1 Datasheet, PDF (362/554 Pages) Freescale Semiconductor, Inc – MC9S12NE64V1 Data Sheet

Chapter 12 Ethernet Physical Transceiver (EPHYV2)
Message/Unformatted Code Field
Message code field — Predefined code fields defined in IEEE 802.3u-1995 Annex 28C
Unformatted code filed — 11-bit field containing an arbitrary value
12.3.3.8 Auto-Negotiation Expansion Register
Figure 12-13 shows the contents of the A/N expansion register. The MI process can only read this register.
This register contains information about the A/N capabilities of the port’s link partner and information on
the status of the parallel detection mechanism.
MII Register Address 6 (%00110)
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
0
0
0
0 PDFLT LPNPA NXTPA PRCVD LPANA
W
RESET: 0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
= Unimplemented or Reserved
Figure 12-13. Auto-Negotiation Expansion Register
Read: Anytime
Write: Never
PDFLT — Parallel Detection Fault
This bit is used to indicate that zero or more than one of the NLP receive link integrity test function
for 100BASE-TX have indicated that the link is ready (link_status=READY) when the A/N wait timer
has expired. PDFLT will be reset to 0 after a read of register 6.
1 = Parallel detection fault has occurred
0 = Parallel detection fault has not occurred
LPNPA — Link Partner Next Page Able
Bit to indicate whether the link partner has the capability of using NP.
1 = Link partner is next page able
0 = Link partner is not next page able
NXTPA — Next Page Able
This bit is used to inform the MI and the link partner whether the port has next page capabilities.
1 = The port has next page capabilities
0 = The port does not have next page capabilities
PRCVD — Page Received
Bit is used to indicate whether a new link code word has been received and stored in the A/N link
partner ability register (MII register 5). PRCVD is reset to 0 after register 6 is read.
1 = Three identical and consecutive link code words have been received from link partner
0 = Three identical and consecutive link code words have not been received from link partner
MC9S12NE64 Data Sheet, Rev. 1.1
362
Freescale Semiconductor