LAN9303 Datasheet, PDF (170/366 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

13.2.6.1
Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Datasheet
Virtual PHY Basic Control Register (VPHY_BASIC_CTRL)
Offset:
1C0h
Index (decimal): 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 8.4, "EEPROM Loader," on page 113 for more
information.
BITS
DESCRIPTION
31:16 RESERVED
(See Note 13.17)
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
14 Loopback (VPHY_LOOPBACK)
This bit enables/disables the loopback mode. When enabled, transmissions
from the external 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 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: 100/200 Mbps
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
11 Power Down (VPHY_PWR_DWN)
This bit is not used by the Virtual PHY and has no effect.
10 Isolate (VPHY_ISO)
This bit controls the MII input/output pins. When set and in MII/RMII PHY
mode, the MII output pins are not driven, MII pull-ups and pull-downs are
disabled and the input pins are ignored. When in MAC mode, this bit is
ignored and has no effect. (Note 13.18)
0: Non-Isolated (Normal operation)
1: Isolated
9 Restart Auto-Negotiation (VPHY_RST_AN)
When set, this bit updates the emulated Auto-Negotiation results.
0: Normal operation
1: Auto-Negotiation restarted
TYPE
RO
R/W
SC
R/W
R/W
R/W
R/W
R/W
R/W
SC
DEFAULT
-
0b
0b
0b
1b
0b
0b
0b
Revision 1.3 (08-27-09)
170
DATASHEET
SMSC LAN9303/LAN9303i