High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
14.2.8.1
Virtual PHY Basic Control Register (VPHY_BASIC_CTRL)
Offset:
Index (decimal):
1C0h
0
Size:
32 bits
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 149 for more
information.
BITS
DESCRIPTION
TYPE
DEFAULT
31:16
RESERVED
(See Note 14.16)
RO
-
15
14
Reset (VPHY_RST)
R/W
SC
0b
0b
When set, this bit resets all the Virtual PHY registers to their default state.
This bit is self clearing.
0: Normal Operation
1: Reset
Loopback (VPHY_LOOPBACK)
R/W
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
13
12
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.
R/W
R/W
0b
1b
0: 10 Mbps
1: 100 Mbps
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
11
10
9
Power Down (VPHY_PWR_DWN)
R/W
R/W
0b
0b
0b
This bit is not used by the Virtual PHY and has no effect.
Isolate (VPHY_ISO)
This bit is not used by the Virtual PHY and has no effect.
Restart Auto-Negotiation (VPHY_RST_AN)
When set, this bit updates the emulated Auto-Negotiation results.
R/W
SC
0: Normal operation
1: Auto-Negotiation restarted
8
Duplex Mode (VPHY_DUPLEX)
This bit is used to set the duplex when the Auto-Negotiation (VPHY_AN) bit
is disabled.
R/W
0b
0: Half Duplex
1: Full Duplex
Revision 1.2 (04-08-08)
246
SMSC LAN9312
DATASHEET
SMSC [ SMSC CORPORATION ]
