DM9161B
10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver
Final 24
Version: DM9161B-12-DS-F01
January 31, 2008
0.8 Duplex mode 1,RW Duplex Mode
1 = Full duplex operation. Duplex selection is allowed when
Auto-negotiation is disabled (bit 12 of this register is cleared). With
auto-negotiation enabled, this bit reflects the duplex capability
selected by auto-negotiation
0 = Normal operation
0.7 Collision test 0,RW Collision Test
1 = Collision test enabled. When set, this bit will cause the COL
signal to be asserted in response to the assertion of TX_EN
0 = Normal operation
0.6-0.0 Reserved 0,RO Reserved
Read as 0, ignore on write
8.2 Basic Mode Status Register (BMSR) - 01
Bit Bit Name Default Description
1.15 100BASE-T4 0,RO/P 100BASE-T4 Capable
1 = DM9161B is able to perform in 100BASE-T4 mode
0 = DM9161B is not able to perform in 100BASE-T4 mode
1.14 100BASE-TX
full-duplex
1,RO/P 100BASE-TX Full Duplex Capable
1 = DM9161B is able to perform 100BASE-TX in full duplex mode
0 = DM9161B is not able to perform 100BASE-TX in full duplex mode
1.13 100BASE-TX
half-duplex
1,RO/P 100BASE-TX Half Duplex Capable
1 = DM9161B is able to perform 100BASE-TX in half duplex mode
0 = DM9161B is not able to perform 100BASE-TX in half duplex
mode
1.12 10BASE-T
full-duplex
1,RO/P 10BASE-T Full Duplex Capable
1 = DM9161B is able to perform 10BASE-T in full duplex mode
0 = DM9161B is not able to perform 10BASE-TX in full duplex mode
1.11 10BASE-T
half-duplex
1,RO/P 10BASE-T Half Duplex Capable
1 = DM9161B is able to perform 10BASE-T in half duplex mode
0 = DM9161B is not able to perform 10BASE-T in half duplex mode
1.10-1.7 Reserved 0,RO Reserved
Read as 0, ignore on write
1.6 MF preamble
suppression
1,RO MII Frame Preamble Suppression
1 = PHY will accept management frames with preamble suppressed
0 = PHY will not accept management frames with preamble
suppressed
1.5 Auto-negotiation
Complete
0,RO Auto-negotiation Complete
1 = Auto-negotiation process completed
0 = Auto-negotiation process not completed
1.4 Remote fault 0, RO/LH
Remote Fault
1 = Remote fault condition detected (cleared on read or by a chip
reset). Fault criteria and detection method is DM9161B
implementation specific. This bit will set after the RF bit in the
ANLPAR (bit 13, register address 05) is set
0 = No remote fault condition detected
1.3 Auto-negotiation
ability
1,RO/P Auto Configuration Ability
1 = DM9161B is able to perform auto-negotiation
0 = DM9161B is not able to perform auto-negotiation
1.2 Link status 0,RO/LL Link Status
1 = Valid link is established (for either 10Mbps or 100Mbps operation)
