RTL8201BL datasheet(8/29 Pages) ETC | REALTEK SINGLE CHIP SINGLE PORT 10/100M FAST ETHERNET PHYCEIVER RTL8201BL

Part No.	RTL8201BL

Description	REALTEK SINGLE CHIP SINGLE PORT 10/100M FAST ETHERNET PHYCEIVER RTL8201BL

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RTL8201BL

2002-03-29

Rev.1.2

8

6. Register Descriptions

This section will describe definitions and usage for each of the registers available in the RTL8201BL.

6.1 Register 0 Basic Mode Control Register

Address

Name

Description/Usage

Default/Attribute

0:<15>

Reset

This bit sets the status and control registers of the

PHY in a default state. This bit is self-clearing.

1 = software reset

0 = normal operation

0, RW

0:<14>

Loopback

This bit enables loopback of transmit data nibbles

TXD<3:0> to the receive data path.

1 = enable loopback

0 = normal operation

0, RW

0:<13>

Spd_Set

This bit sets the network speed.

1 = 100Mbps

0 = 10Mbps

When 100Base-FX mode is enabled, this bit=1 and is

read only.

1, RW

0:<12>

Auto

Negotiation

Enable

This bit enables/disables the Nway auto-negotiation

function.

1 = enable auto-negotiation; bits 0:<13> and 0:<8>

will be ignored.

0 = disable auto-negotiation; bits 0:<13> and 0:<8>

will determine the link speed and the data transfer

mode, respectively.

When 100Base-FX mode is enabled, this bit=0 and is

read only.

1, RW

0:<11>

Power Down

This bit turns down the power of the PHY chip

including internal crystal oscillator circuit. The MDC,

MDIO is still alive for accessing the MAC.

1 = power down

0 = normal operation

0, RW

0:<10>

Reserved

0:<9>

Restart Auto

Negotiation

This bits allows the Nway auto-negotiation function

to be reset.

1 = re-start auto-negotiation

0 = normal operation

0, RW

0:<8>

Duplex Mode

This bit sets the duplex mode if auto negotiation is

disabled (bit 0:<12>=0)

1 = full duplex

0 = half duplex

After completing auto negotiation, this bit will reflect

the duplex status.(1: Full duplex, 0: Half duplex)

When 100Base-FX mode is enabled, this bit can be

set through the MDC/MDIO SMI interface or

DUPLEX pin.

1, RW

0:<7:0>

Reserved

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