AM79C978A AMD [Advanced Micro Devices], AM79C978A Datasheet - Page 179

• Manufacturer Part Number: AM79C978A
• Description: Single-Chip 1/10 Mbps PCI Home Networking Controller
• 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.
Note:
1. LH = Latching High, LL = Latching Low.
(Note 1)
(Note 1)
Reg
1
1
1
1
1
1
1
1
1
1
1
1
1
10-7
Bits
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
MF Preamble Suppression
Auto-Negotiation Complete
Remote Fault
Auto-Negotiation Ability
Link Status
Jabber Detect
Extended Capability
Table 49. TBR1: 10BASE-T PHY Status Register (Register 1)
Name
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
0 = not 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
0 = Auto-Negotiation not 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
1 = jabber condition detected
0 = no jabber condition detected
1 = extended register capabilities
0 = basic register set capabilities only
0 = link is down
Am79C978A
Description
Read/Write
(Note 1)
RO, LH
RO, LL
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Default
Value
0
0
0
1
1
0
1
0
0
1
0
0
1
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