DM9620 datasheet(31/71 Pages) DAVICOM

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DM9620

USB2.0 to Fast Ethernet Controller

Preliminary

Version: DM9620 -15-DS-P02

February 20, 2012

6.1 Basic Mode Control Register (BMCR) – 00H

Bit

Bit Name

Default

Description

Reset

0, RW/SC

Reset:

1=Software reset

0=Normal operation

This bit sets the status and controls the PHY registers to their

default states. This bit, which is self-clearing, will keep returning a

value of one until the reset process is completed

Loopback

0, RW

Loopback:

Loop-back control register

1 = Loop-back enabled

0 = Normal operation

When in 100Mbps operation mode, setting this bit may cause the

descrambler to lose synchronization and produce a 1300ms "dead

time" before any valid data appear at the MII receive outputs

Speed selection

1, RW

Speed select:

1 = 100Mbps

0 = 10Mbps

Link speed may be selected either by this bit or by auto-negotiation.

When auto-negotiation is enabled and bit 12 is set, this bit will return

auto-negotiation selected media type.

Auto-negotiatio

n enable

1, RW

Auto-negotiation enable:

1 = Auto-negotiation is enabled, bit 8 and 13 will be in

auto-negotiation status

Power down

0, RW

Power Down:

While in the power-down state, the PHY should respond to

management transactions. During the transition to power-down

state and while in the power-down state, the PHY should not

generate spurious signals on the MII.

1=Power down

0=Normal operation

Isolate

0,RW

Isolate:

1 = Isolates the PHY from the MII with the exception of the serial

management. (When this bit is asserted, the PHY does not respond

to the TXD[0:3], TX_EN, and TX_ER inputs, and it shall present a

high impedance on its TX_CLK, RX_CLK, RX_DV, RX_ER, RX[0:3],

COL and CRS outputs. When PHY is isolated from the MII it shall

respond to the management transactions)

0 = Normal operation

Restart

auto-negotiation

0,RW/SC

Restart auto-negotiation:

1 = Restart auto-negotiation. Re-initiates the auto-negotiation

process. When auto-negotiation is disabled (bit 12 of this register

cleared), this bit has no function and it should be cleared. This bit is

self-clearing and it will keep returning a value of 1 until

auto-negotiation is initiated by the PHY. The operation of the

auto-negotiation process will not be affected by the management

entity that clears this bit

0 = Normal operation

DM9620 Datenblatt(PDF) 31 Page - Davicom Semiconductor, Inc.

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