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Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9311/LAN9311i 247 Revision 1.4 (08-19-08)
DATASHEET
14.2.8.1 Virtual PHY Basic Control Register (VPHY_BASIC_CTRL)
This read/write register is used to configure the Virtual PHY.
Note: This register is re-written in its entirety by the EEPROM Loader following the release or reset
or a RELOAD command. Refer to Section 10.2.4, "EEPROM Loader," on page 150 for more
information.
Offset:
Index (decimal):
1C0h
0
Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31:16 RESERVED
(See Note 14.16)
RO -
15
Reset (VPHY_RST)
When set, this bit resets all the Virtual PHY registers to their default state.
This bit is self clearing.
0: Normal Operation
1: Reset
R/W
SC
0b
14
Loopback (VPHY_LOOPBACK)
This bit enables/disables the loopback mode. When enabled, transmissions
from the Host MAC are not sent to the switch fabric. Instead, they are looped
back onto the receive path.
0: Loopback mode disabled (normal operation)
1: Loopback mode enabled
R/W 0b
13
Speed Select LSB (VPHY_SPEED_SEL_LSB)
This bit is used to set the speed of the Virtual PHY when the Auto-
Negotiation (VPHY_AN) bit is disabled.
0: 10 Mbps
1: 100 Mbps
R/W 0b
12
Auto-Negotiation (VPHY_AN)
This bit enables/disables Auto-Negotiation. When enabled, the Speed Select
LSB (VPHY_SPEED_SEL_LSB) and Duplex Mode (VPHY_DUPLEX) bits
are overridden.
0: Auto-Negotiation disabled
1: Auto-Negotiation enabled
R/W 1b
11
Power Down (VPHY_PWR_DWN)
This bit is not used by the Virtual PHY and has no effect.
R/W 0b
10
Isolate (VPHY_ISO)
This bit is not used by the Virtual PHY and has no effect.
R/W 0b
9
Restart Auto-Negotiation (VPHY_RST_AN)
When set, this bit updates the emulated Auto-Negotiation results.
0: Normal operation
1: Auto-Negotiation restarted
R/W
SC
0b
8
Duplex Mode (VPHY_DUPLEX)
This bit is used to set the duplex when the Auto-Negotiation (VPHY_AN) bit
is disabled.
0: Half Duplex
1: Full Duplex
R/W 0b