Specifications

DP83848C , DP83848I
DP83848VYB, DP83848YB
SNLS266E –MAY 2007–REVISED MARCH 2015 www.ti.com
Table 6-9. Basic Mode Control Register (BMCR), address 0x00h (continued)
Bit Bit Name Default Description
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 deasserted within 4-bit times in
response to the deassertion of TX_EN.
6:0 RESERVED 0, RO RESERVED: Write ignored, read as 0.
6.6.1.1.2 Basic Mode Status Register (BMSR)
Table 6-10. Basic Mode Status Register (BMSR), address 0x01h
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.
10:7 RESERVED 0, RO RESERVED: Write as 0, read as 0.
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.
4 REMOTE FAULT 0, RO/LH Remote Fault:
1 = Remote Fault condition detected (cleared on read or by reset). Fault criteria:
NOTIFICATION from Link Partner of Remote Fault.
0 = No remote fault condition detected.
3 AUTO-NEGOTIATION 1, RO/P Auto Negotiation Ability:
ABILITY
1 = Device is able to perform Auto-Negotiation.
0 = Device is not able to perform Auto-Negotiation.
2 LINK STATUS 0, RO/LL Link Status:
1 = Valid link established (for either 10 or 100 Mb/s operation).
0 = Link not established.
The criteria for link validity is implementation specific. The occurrence of a link failure
condition will causes the Link Status bit to clear. Once cleared, this bit may only be set by
establishing a good link condition and a read through the management interface.
52 Detailed Description Copyright © 2007–2015, Texas Instruments Incorporated
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