TLK100_11 Datasheet, PDF (44/88 Pages) Texas Instruments – Industrial Temp, Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver

TLK100
SLLS931B – AUGUST 2009 – REVISED DECEMBER 2009
www.ti.com
8.1.1 Basic Mode Control Register (BMCR)
Table 8-3. Basic Mode Control Register (BMCR), address 0x0000
BIT
BIT NAME
15 Reset
DEFAULT
0, RW/SC
DESCRIPTION
PHY Software Reset:
1 = Initiate software Reset / Reset in Process.
0 = Normal operation.
14 Loopback
13 Speed Selection
12 Auto-Negotiation
Enable
11 Power Down
10 Isolate
9 Restart Auto-
Negotiation
8 Duplex Mode
7 Collision Test
6:0 RESERVED
0, RW
Jumper, RW
Jumper, RW
0, RW
0, RW
0, RW/SC
Jumper, RW
0, RW
0, RO
Writing a 1 to this bit causes the PHY to be reset. When the reset operation is done, this bit
is cleared to 0 automatically. The configuration is relatched.
Loopback:
1 = Loopback enabled.
0 = Normal operation.
When loopback mode is activated, the transmitter data presented on TXD is looped back to
RXD internally
Speed Select:
When auto-negotiation is disabled writing to this bit allows the port speed to be selected.
1 = 100 Mb/s
0 = 10 Mb/s
Auto-Negotiation Enable:
Configuration pin (jumper) controls initial value at reset.
1 = Auto-Negotiation Enabled – bits 8 and 13 of this register are ignored when this bit is
set.
0 = Auto-Negotiation Disabled – bits 8 and 13 determine the port speed and duplex
mode.
Power Down:
1 = Enables Power Down Modes - General Power Down Mode, Active Sleep Mode and
Passive Sleep Mode (see register 0x10)
0 = Normal operation.
Isolate:
1 = Isolates the Port from the MII with the exception of the serial management.
0 = Normal operation.
Restart Auto-Negotiation:
1 = Restart Auto-Negotiation. Re-initiates the Auto-Negotiation process. If
Auto-Negotiation is disabled (bit 12 = 0), this bit is ignored. This bit is self-clearing
and will return a value of 1 until Auto-Negotiation is initiated, whereupon it will
self-clear. Operation of the Auto-Negotiation process is not affected by the
management entity clearing this bit.
0 = Normal operation.
Re-initiates the Auto-Negotiation process. If Auto-Negotiation is disabled (bit 12 = 0), this bit
is ignored. This bit is self-clearing and will return a value of 1 until Auto-Negotiation is
initiated, whereupon it self-clears. Operation of the Auto-Negotiation process is not affected
by the management entity clearing this bit.
Duplex Mode:
When auto-negotiation is disabled writing to this bit allows the port Duplex capability to be
selected.
1 = Full Duplex operation.
0 = Half Duplex operation.
Collision Test:
1 = Collision test enabled.
0 = Normal operation
RESERVED: Write ignored, read as 0.
44
Register Block
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