LAN9303 Datasheet, PDF (179/366 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Datasheet
BITS
DESCRIPTION
7 100BASE-X Half Duplex
This bit indicates the emulated link partner PHY 100BASE-X half duplex
capability.
0: 100BASE-X half duplex ability not supported
1: 100BASE-X half duplex ability supported
6 10BASE-T Full Duplex
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
5 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
TYPE
RO
DEFAULT
Note 13.38
RO
Note 13.38
RO
Note 13.38
RO
00001b
Note 13.35 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 13.36 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 13.37 The emulated link partner’s asymmetric/symmetric pause ability is based upon the values
of the Asymmetric Pause and Symmetric 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 13.6.
The link partner pause ability bits are determined when Auto-Negotiation is complete.
Changing the Virtual PHY Auto-Negotiation Advertisement Register (VPHY_AN_ADV) will
have no affect until the Auto-Negotiation process is re-run. If the local device advertises
both Symmetric and Asymmetric pause, the result is determined based on the
FD_FC_strap_0 configuration strap. This allows the user the choice of network emulation.
If FD_FC_strap_0 = 1, then the result is Symmetrical, else Asymmetrical. See Section
7.3.1, "Virtual PHY Auto-Negotiation," on page 102 for additional information.
Table 13.6 Emulated Link Partner Pause Flow Control Ability Default Values
VPHY
SYMMETRIC
PAUSE
(REGISTER 4.10)
VPHY
ASYMMETRIC
PAUSE
(REGISTER 4.11)
No Flow Control Enabled
0
0
Symmetric Pause
1
0
Asymmetric Pause
0
1
Towards Switch
Asymmetric Pause
1
1
Towards MAC
Symmetric Pause
1
1
FD_FC_strap_0
x
x
x
0
1
LINK PARTNER
SYMMETRIC
PAUSE
(REGISTER 5.10)
LINK PARTNER
ASYMMETRIC
PAUSE
(REGISTER 5.11)
0
0
1
0
1
1
0
1
1
1
SMSC LAN9303/LAN9303i
179
DATASHEET
Revision 1.3 (08-27-09)