DM9161 datasheet(22/47 Pages) ETC

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DM9161

10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

Final

Version: DM9161-DS-F02

May 10,2002

8.1 Basic Mode Control Register (BMCR) - 00

Bit

Bit Name

Default

Description

0.15

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

0.14

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 720ms "dead

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

0.13

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 medium type

0.12

Auto-negotiation

enable

1, RW

Auto-negotiation Enable

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

status

0.11

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

0.10

Isolate

0,RW

Isolate

1 = Isolates the DM9161 from the MII with the exception of the serial

management. (When this bit is asserted, the DM9161 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

0.9

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 to a value of 1 until auto-

negotiation is initiated by the DM9161. The operation of the auto-

negotiation process will not be affected by the management entity that

clears this bit

0 = Normal operation

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