High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
BITS
DESCRIPTION
TYPE
DEFAULT
7
100BASE-X Half Duplex
This bit indicates the emulated link partner PHY 100BASE-X half duplex
capability.
RO
Note 14.36
0: 100BASE-X half duplex ability not supported
1: 100BASE-X half duplex ability supported
6
5
10BASE-T Full Duplex
RO
RO
RO
Note 14.36
Note 14.36
00001b
This bit indicates the emulated link partner PHY 10BASE-T full duplex
capability.
0: 10BASE-T full duplex ability not supported
1: 10BASE-T full duplex ability supported
10BASE-T Half Duplex
This bit indicates the emulated link partner PHY 10BASE-T half duplex
capability.
0: 10BASE-T half duplex ability not supported
1: 10BASE-T half duplex ability supported
4:0
Selector Field
This field identifies the type of message being sent by Auto-Negotiation.
00001: IEEE 802.3
Note 14.33 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 14.34 The emulated link partner does not support next page, always instantly sends its link code
word, never sends a fault, and does not support 100BASE-T4.
Note 14.35 The emulated link partner’s asymmetric/symmetric pause ability is based upon the values
of the Asymmetric Pause and Pause bits of the Virtual PHY Auto-Negotiation
Advertisement Register (VPHY_AN_ADV). Thus the emulated link partner always
accommodates the request of the Virtual PHY, as shown in Table 14.5. See Section 7.3.1,
"Virtual PHY Auto-Negotiation," on page 96 for additional information.
Table 14.5 Emulated Link Partner Pause Flow Control Ability Default Values
VPHY Symmetric
Pause
(register 4.10)
VPHY Asymmetric
Pause
(register 4.11)
Link Partner
Symmetric Pause
(register 5.10)
Link Partner
AsymmetricPause
(register 5.11)
No Flow Control Enabled
Symmetric Pause
0
1
0
0
0
1
0
1
1
0
0
1
Asymmetric Pause Towards
Switch
Asymmetric Pause Towards MAC
1
1
0
1
Note 14.36 The emulated link partner always has the following capabilities: 100BASE-X full duplex,
100BASE-X half duplex, 10BASE-T full duplex, and 10BASE-T half duplex. For more
information on the Virtual PHY auto-negotiation, see Section 7.3.1, "Virtual PHY Auto-
Negotiation," on page 96.
SMSC LAN9312
255
Revision 1.2 (04-08-08)
DATASHEET
SMSC [ SMSC CORPORATION ]
