High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
14.2.8.7
Virtual PHY Auto-Negotiation Expansion Register (VPHY_AN_EXP)
Offset:
Index (decimal):
1D8h
6
Size:
32 bits
This register is used in the Auto-Negotiation process.
BITS
DESCRIPTION
TYPE
DEFAULT
31:16
RESERVED
(See Note 14.37)
RO
-
15:5
4
RESERVED
RO
RO
-
Parallel Detection Fault
This bit indicates whether a Parallel Detection Fault has been detected. This
bit is always 0.
0b
Note 14.38
0: A fault hasn’t been detected via the Parallel Detection function
1: A fault has been detected via the Parallel Detection function
3
2
Link Partner Next Page Able
RO
RO
0b
This bit indicates whether the link partner has next page ability. This bit is
always 0.
Note 14.39
0: Link partner does not contain next page capability
1: Link partner contains next page capability
Local Device Next Page Able
This bit indicates whether the local device has next page ability. This bit is
always 0.
0b
Note 14.39
0: Local device does not contain next page capability
1: Local device contains next page capability
1
0
Page Received
RO/LH
RO
1b
This bit indicates the reception of a new page.
Note 14.40
0: A new page has not been received
1: A new page has been received
Link Partner Auto-Negotiation Able
This bit indicates the Auto-negotiation ability of the link partner.
1b
Note 14.41
0: Link partner is not Auto-Negotiation able
1: Link partner is Auto-Negotiation able
Note 14.37 The reserved bits 31-16 are used to pad the register to 32-bits so that each register is on
a DWORD boundary. When accessed serially (through the MII management protocol), the
register is 16-bits wide.
Note 14.38 Since the Virtual PHY link partner is emulated, there is never a Parallel Detection Fault
and this bit is always 0.
Note 14.39 Next page ability is not supported by the Virtual PHY or emulated link partner.
Note 14.40 The page received bit is clear when read. It is first cleared on reset, but set shortly
thereafter when the Auto-Negotiation process is run.
Note 14.41 The emulated link partner will show Auto-Negotiation able unless Auto-Negotiation fails (no
common bits between the advertised ability and the link partner ability).
Revision 1.2 (04-08-08)
256
SMSC LAN9312
DATASHEET
SMSC [ SMSC CORPORATION ]
