RTL8201L Просмотр технического описания (PDF) - Realtek Semiconductor

Номер в каталоге

Компоненты Описание

производитель

RTL8201L

REALTEK SINGLE CHIP SINGLE PORT 10/100MBPS FAST ETHERNET PHYCEIVER

Realtek Semiconductor 

RTL8201(L)

0:<12>

0:<11>

0:<10>

0:<9>

0:<8>

0:<7:0>

Auto

Negotiation

Enable

Power Down

Reserved

Restart Auto

Negotiation

Duplex Mode

Reserved

Auto Negotiation Enable: Auto-negotiation can be disabled by either

hardware or software control. This bit can enable/disable the Nway

auto-negotiation function. If the ANEN input pin is driven to a logic ‘0’,

Auto-negotiation is disabled by software control. When

Auto-negotiation is disabled in this manner, writing a ‘1’ to the same bit

of the control register or resetting the chip will re-enable

Auto-negotiation. Writing to this bit has no effect when

Auto-negotiation has been disabled by hardware control. When read,

this bit will return the value most recently written to this location, or ‘1’

if it has not been written since the last chip reset.

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 this bit is read only.

Power Down: The RTL8201L supports a low power mode which is

intended to decrease power consumption. 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.

Writing a ‘1’ will enable power down mode, and writing a ‘0’ will

return the RTL8201L to normal operation. When read, this register will

return a ‘1’ when in power down mode, and a ‘0’ during normal

operation.

1: Power down

0: Normal operation

Reserved: Ignore the output of the RTL8201L when these bits are read.

Restart Auto Negotiation: Bit 9 is a self-clearing bit that allows the

Nway auto-negotiation process to be restarted, regardless of the current

status of the Auto-negotiation state machine. In order for this bit to have

an effect, Auto-negotiation must be enabled. Writing a ‘1’ to this bit

restarts Auto-negotiation while writing a ‘0’ to this bit has no effect.

When this bit is read, it will always return a ‘0’.

1: Re-start auto-negotiation

0: Normal operation

Duplex Mode: By default, the RTL8201L powers up in half duplex

mode. The chip can be forced into full duplex mode by writing a ‘1’ to

bit 8 while Auto-negotiation is disabled. Half duplex mode can be

resumed either by writing a ‘0’ to bit 8 or by resetting the chip. When

Nway is enabled, this bit reflects the results of the Auto-negotiation, and

is in a read only mode. When Nway is disabled, this bit can be set

through the SMI, and is in a read/write mode. When 100FX is enabled,

this bit can be set through the SMI or FX_DUPLEX pin and is in a

read/write mode. This bit sets the duplex mode if auto negotiation is

disabled (bit 0:<12>=0).

1: Full duplex

0: Normal operation

After auto negotiation completes, this bit will reflect the duplex status.

Reserved Bits: All reserved MII register bits must be written as ‘0’ at

all times. Ignore the RTL8201L output when these bits are read.

1, RW

0, RW

0, RW

1, RW

2002-01-18

8

Rev.1.04

Tel: +49(0)234-9351135 · Fax: +49(0)234-9351137 E-MAIL: info@cornelius-consult.de

http://www.cornelius-consult.de

Share Link: