LAN8820I datasheet(36/83 Pages) MICROCHIP

36 / 83 page

LAN8820/LAN8820I

DS00001871B-page 36

 2009-2015 Microchip Technology Inc.

4.2.1

BASIC CONTROL REGISTER

Note 4-1

The default is determined by the CONFIG[3:2] pins as described in Section 3.8.1.2.3, "Configuration

Bits Impacted by the Mode of Operation," on page 26“

Index (In Decimal): 0

Size:

16 bits

Bits

Description

Type

Default

PHY Soft Reset (RESET)

1 = PHY software reset. This bit is self-clearing. When setting this bit, do not

set other bits in this register. The configuration is set from the register bit

values as described in Section 3.6.2, "Software Reset," on page 22.

Note:

The PHY will be in the normal mode after a PHY software reset.

R/W

Loopback

0 = normal operation

1 = loopback mode

R/W

Speed Select[0]

Together with Speed Select[1], sets speed per the following table:

[Speed Select1][Speed Select 0]

00 = 10Mbps

01 = 100Mbps

10 = 1000Mbps

11 = Reserved

Note:

Ignored if the Auto-Negotiation Enable bit of this register is 1.

R/W

Note 4-1

Auto-Negotiation Enable

0 = disable auto-negotiate process

1 = enable auto-negotiate process (overrides the Speed Select[0], Speed

Select[1], and Duplex Mode bits of this register)

R/W

Note 4-1

Power Down

0 = normal operation

1 = General power down mode

Note:

Auto-Negotiation Enable must be cleared before setting this bit.

R/W

Isolate

0 = normal operation

1 = electrical isolation of PHY from RGMII

R/W

Restart Auto-Negotiate

0 = normal operation

1 = restart auto-negotiate process

Note:

Bit is self-clearing.

R/W

Duplex Mode

0 = half duplex

1 = full duplex

Note:

Ignored if the Auto-Negotiation Enable bit of this register is 1.

R/W

Note 4-1

RESERVED

Speed Select[1]

See description for Speed Select[0] for details.

Note 4-1

5:0

RESERVED

LAN8820I Datasheet(PDF) 36 Page - Microchip Technology

LAN8820I Datasheet(HTML) 36 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

Datasheet Download

Link URL