AM79C901AJCT AMD [Advanced Micro Devices], AM79C901AJCT Datasheet - Page 58

• Manufacturer Part Number: AM79C901AJCT
• Description: HomePHY Single-Chip 1/10 Mbps Home Networking PHY
• Manufacturer: AMD [Advanced Micro Devices]

TBR1: 10BASE-T Status Register (Register 1)
The Status Register identifies the physical and Auto-
Negotiation capabilities of the local PHY. This register
is read only; a write will have no effect. See Table 42.
Note:
1. LH = Latching High, LL = Latching Low.
58
Bits
10:7
15
14
13
12
11
6
5
4
3
2
1
0
100BASE-T4
100BASE-X Full-Duplex
100BASE-X Half-Duplex
10 Mbps Full-Duplex
10 Mbps Half-Duplex
Reserved
Management Frame Preamble
Suppression
Auto-Negotiation Complete
Remote Fault
Auto-Negotiation Ability
Link Status
Jabber Detect
Extended Capability
Name
Table 42. TBR1: 10BASE-T PHY Status Register (Register 1)
P R E L I M I N A R Y
1 = 100BASE-T4 able
0 = Not 100BASE-T4 able
1 = 100BASE-X full-duplex able
0 = Not 100BASE-X full-duplex able
1 = 100BASE-X half-duplex able
0 = Not 100BASE-X half-duplex able
1 = 10 Mbps full-duplex able
1 = 10 Mbps half-duplex able
0 = Not 10 Mbps half-duplex able
Ignore when read
1 = PHY can accept management (mgmt)
frames with or without preamble
0 = PHY can only accept mgmt frames with
preamble
1 = Auto-Negotiation completed
1 = Remote fault detected
0 = No remote fault detected
1 = PHY able to auto-negotiate,
0 = PHY not able to auto-negotiate
1 = Link is up
0 = Link is down
1 = Jabber condition detected
0 = No jabber condition detected
1 = Extended register capabilities
0 = Basic register set capabilities only
0 = Not 10 Mbps full-duplex able
0 = Auto-Negotiation not completed
Am79C901A
Description
Read/Write
(Note 1)
(Note 1)
(Note 1)
R, LH
R, LL
R
R
R
R
R
R
R
R
R
R
R
Default
Value
(hex)
X
0
0
0
1
1
1
0
0
1
0
0
1