SMSC LAN9312 - Manual (Page 246)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 246 SMSC LAN9312
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 149 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