LAN89218 datasheet(113/148 Pages) MICROCHIP

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DS60001255B-page 113

LAN89218

5.5.1

BASIC CONTROL REGISTER

Note 1:

The default value of this bit is determined by Pin 74 "SPEED_SEL". Refer to the pin description section for

more details.

Index (In Decimal):

Size:

16-bits

Bits

Description

Type

Default

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

Loopback. 1 = loopback mode, 0 = normal operation

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

enabled (0.12 = 1).

See Note 1

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

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

See Note 1

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

Note:

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

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

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

Reserved

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

ation. Bit is self-clearing.

RW/SC

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

enabled (0.12 = 1).

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

6:0

Reserved

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