Datasheet

16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support

Datasheet

Revision 2.9 (03-01-12) 118 SMSC LAN9220

DATASHEET

5.5.1 Basic Control Register

Note 5.1 The default value of this bit is determined by the auto-negotiation process.

Index (In Decimal): 0 Size: 16-bits

BITS DESCRIPTION TYPE DEFAULT

15 Reset. 1 = software reset. Bit is self-clearing. For best results, when setting

this bit do not set other bits in this register.

RW/SC 0

14 Loopback. 1 = loopback mode, 0 = normal operation RW 0

13 Speed Select. 1 = 100Mbps, 0 = 10Mbps. Ignored if Auto Negotiation is

enabled (0.12 = 1).

RW See Note 5.1

12 Auto-Negotiation Enable. 1 = enable auto-negotiate process (overrides

0.13 and 0.8) 0 = disable auto-negotiate process.

RW 1

11 Power Down. 1 = General power down-mode, 0 = normal operation.

Note: After this bit is cleared, the PHY may auto-negotiate with it's

partner station. This process may take a few seconds to complete.

Once auto-negotiation is complete, bit 5 of the PHY's Basic Status

RW 0

10 Reserved RO 0

9 Restart Auto-Negotiate. 1 = restart auto-negotiate process 0 = normal

operation. Bit is self-clearing.

RW/SC 0

8 Duplex Mode. 1 = full duplex, 0 = half duplex. Ignored if Auto Negotiation

is enabled (0.12 = 1).

RW See Note 5.1

7 Collision Test. 1 = enable COL test, 0 = disable COL test RW 0

6-0 Reserved RO 0