Datasheet

DP83630
SNLS335B –OCTOBER 2010–REVISED APRIL 2013 www.ti.com
Table 10-3. Basic Mode Control Register (BMCR), address 0x00 (continued)
Bit Bit Name Default Description
9 RESTART 0, RW/SC Restart Auto-Negotiation:
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.
8 DUPLEX MODE Strap, RW 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.
7 COLLISION TEST 0, RW Collision Test:
1 = Collision test enabled.
0 = Normal operation.
When set, this bit will cause the COL signal to be asserted in response to the assertion
of TX_EN within 512-bit times. The COL signal will be de-asserted within 4-bit times in
response to the de-assertion of TX_EN.
6 RESERVED 0, RO RESERVED: Write ignored, read as 0.
5 UNIDIRECTIONAL 0, RW Unidirectional Enable:
ENABLE 1 = Allow 100 Mb transmit activity independent of link status.
0 = Require link up for 100 Mb/s transmit activity.
This bit has no effect in 10 Mb/s mode..
4:0 RESERVED 0 0000, RO RESERVED: Write ignored, read as 0.
10.1.2 Basic Mode Status Register (BMSR)
Table 10-4. Basic Mode Status Register (BMSR), address 0x01
Bit Bit Name Default Description
15 100BASE-T4 0, RO/P 100BASE-T4 Capable:
0 = Device not able to perform 100BASE-T4 mode.
14 100BASE-TX 1, RO/P 100BASE-TX Full Duplex Capable:
FULL DUPLEX 1 = Device able to perform 100BASE-TX in full duplex mode.
13 100BASE-TX 1, RO/P 100BASE-TX Half Duplex Capable:
HALF DUPLEX 1 = Device able to perform 100BASE-TX in half duplex mode.
12 10BASE-T 1, RO/P 10BASE-T Full Duplex Capable:
FULL DUPLEX 1 = Device able to perform 10BASE-T in full duplex mode.
11 10BASE-T 1, RO/P 10BASE-T Half Duplex Capable:
HALF DUPLEX 1 = Device able to perform 10BASE-T in half duplex mode.
10:8 RESERVED 000, RO RESERVED: Write as 0, read as 0.
7 UNIDIRECTIONAL 1, RO/P Unidirectional Ability:
ABILITY 1 = Device able to transmit in 100 Mb/s mode independent of link status.
6 MF PREAMBLE 1, RO/P Preamble Suppression Capable:
SUPPRESSION
1 = Device able to perform management transaction with preamble suppressed, 32-bits of
preamble needed only once after reset, invalid opcode or invalid turnaround.
0 = Normal management operation.
5 AUTO-NEGOTIATION 0, RO Auto-Negotiation Complete:
COMPLETE
1 = Auto-Negotiation process complete.
0 = Auto-Negotiation process not complete.
80 Register Block Copyright © 2010–2013, Texas Instruments Incorporated
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