MC9S12NE64CPVE Datasheet, PDF (359/554 Pages) Freescale Semiconductor, Inc – MC9S12NE64 Device Overview

Memory Map and Register Descriptions
12.3.3.5 Auto-Negotiate (A/N) Advertisement Register
The auto-negotiation (A/N) process requires four registers to communicate link information with its link
partner: A/N advertisement register (MII register 4), A/N link partner ability register (MII register 5), A/N
expansion register (MII register 6), and the A/N next page transmit register (MII register 7).
Figure 12-10 shows the contents of the A/N advertisement register. On power-up, before A/N starts, the
register sets the selector field, bits 4.4:0, to 00001 to indicate that it is IEEE Standard 802.3 compliant. The
technology ability fields (4.9:5) are set according to the values in the MII status register (1.15:11). The MI
can set the technology ability field bits before renegotiations to allow management to auto-negotiate to an
alternate common mode.
MII Register Address 4 (%00100)
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
R
0
0
NXTP
RFLT
W
0
FLCTL
0
TAF TAF TAF TAF
100FD 100HD 10FD 10HD
SELECTORFIELD[4:0]
RESET: 1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
= Unimplemented or Reserved
Figure 12-10. Auto Negotiate Advertisement Register
Read: Anytime
Write: Never
NXTP — Next Page
1 = Capable of sending next pages
0 = Not capable of sending next pages
RFLT — Remote Fault
1 = Remote fault
0 = No remote fault
FLCTL — Flow Control
1 = Advertise implementation of the optional MAC control sublayer and pause function as specified
in IEEE standard clause 31 and anex 31B of 802.3. Setting FLCTL has no effect except to set
the corresponding bit in the FLP stream
0 = No MAC-based flow control
TAF100FD — 100BASE-TX Full-Duplex
1 = 100BASE-TX full -duplex capable
0 = Not 100BASE-TX full-duplex capable
TAF100HD — 100BASE-TX Half-Duplex
1 = 100BASE-TX half-duplex capable
0 = Not 100BASE-TX half-duplex capable
TAF10FD — 10BASE-T Full-Duplex
1 = 10BASE-T full-duplex capable
0 = Not 10BASE-T full-duplex capable
MC9S12NE64 Data Sheet, Rev. 1.1
Freescale Semiconductor
359