DM9601E ETC1 [List of Unclassifed Manufacturers], DM9601E Datasheet - Page 29

• Manufacturer Part Number: DM9601E
• Description: USB Ethernet MAC Controller with Intergrated 10/100 PHY
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

11.1 Basic Mode Control Register (BMCR) - 00
Preliminary
Version: DM9601-DS-P01
April 24, 2001
0.15
0.14
0.13
0.12
0.11
0.10
0.9
Bit
Speed selection
Restart auto-
Power down
negotiation
negotiation
Bit Name
Loopback
enable
Isolate
Reset
Auto-
0, RW/SC
0,RW/SC
Default
0, RW
1, RW
1, RW
0, RW
0,RW
USB to Ethernet MAC Controller with Integrated 10/100 PHYsceiver
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
Loopback 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 appear at the MII receive outputs
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-negotiation Enable
1 = Auto-negotiation is enabled, bit 8 and 13 will be in auto-
negotiation status
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
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
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
Description
DM9601
29