DM8203
2-port switch with MII / RMII Interface
7
Collision test
Reserved
0,RW
0,RO
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 in
internal MII interface.
0 = Normal operation
Reserved
6-0
Read as 0, ignore on write
8.2 Basic Mode Status Register (BMSR) – 01H
Bit
Bit Name
Default
Description
15
100BASE-T4
0,RO/P 100BASE-T4 Capable
1 = DM8203 is able to perform in 100BASE-T4 mode
0 = DM8203 is not able to perform in 100BASE-T4 mode
1,RO/P 100BASE-TX Full Duplex Capable
1 = DM8203 is able to perform 100BASE-TX in full duplex mode
0 = DM8203 is not able to perform 100BASE-TX in full duplex mode
1,RO/P 100BASE-TX Half Duplex Capable
14
13
100BASE-TX
full-duplex
100BASE-TX
half-duplex
1 = DM8203 is able to perform 100BASE-TX in half duplex mode
0 = DM8203 is not able to perform 100BASE-TX in half duplex
mode
12
11
10BASE-T
full-duplex
1,RO/P 10BASE-T Full Duplex Capable
1 = DM8203 is able to perform 10BASE-T in full duplex mode
0 = DM8203 is not able to perform 10BASE-TX in full duplex mode
1,RO/P 10BASE-T Half Duplex Capable
10BASE-T
half-duplex
1 = DM8203 is able to perform 10BASE-T in half duplex mode
0 = DM8203 is not able to perform 10BASE-T in half duplex mode
10-7
6
Reserved
0,RO
1,RO
Reserved
Read as 0, ignore on write
MII Frame Preamble Suppression
1 = PHY will accept management frames with preamble suppressed
0 = PHY will not accept management frames with preamble
suppressed
MF preamble
suppression
5
4
Auto-negotiation
Complete
0,RO
Auto-negotiation Complete
1 = Auto-negotiation process completed
0 = Auto-negotiation process not completed
Remote Fault
Remote fault
0, RO
1 = Remote fault condition detected (cleared on read or by a chip
reset). Fault criteria and detection method is DM8203
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
3
2
Auto-negotiation
ability
1,RO/P Auto Configuration Ability
1 = DM8203 is able to perform auto-negotiation
0 = DM8203 is not able to perform auto-negotiation
Link status
0,RO
Link Status
1 = Valid link is established (for either 10Mbps or 100Mbps
operation)
0 = Link is not established
Preliminarydatasheet
DM8203-15-DS-P05
October 23, 2008
33
DAVICOM [ DAVICOM SEMICONDUCTOR, INC. ]
