am79c901a Advanced Micro Devices, am79c901a Datasheet - Page 44

• Manufacturer Part Number: am79c901a
• Description: Homephy Single-chip 1/10 Mbps Home Networking Phy
• Manufacturer: Advanced Micro Devices

HPR0: HomePNA PHY Control Register (Register 0)
Notes:
1. For collision test, the “enable loopback mode” bit must also be set to ensure that collision traffic is not imposed
2. R/W = Read/Write; R = Read only.
44
Bits
on the network.
6:0
15
14
13
12
11
10
9
8
7
RESET
Enable Loopback Mode
Speed Selection
Auto-Negotiation Enabled
Power Down
Isolate
Restart Auto-Negotiation
Duplex Mode
Collision Test (Note 1)
Reserved
Name
Table 17. HPR0: HomePNA PHY Control Register (Register 0)
P R E L I M I N A R Y
1 = RESET
0 = Normal operation
** Self Clearing after ~70 s
1 = Loopback mode enable
0 = Loopback mode disable
0 = 10 Mbps
1 = Enabled
0 = Disabled
1 = Power down
0 = Normal operation
(This bit is mirrored in PHY Control bit 4)
1 = Electrically isolates PHY from the MII/GPSI
0 = Normal operation
1 = Restart Auto-Negotiation
0 = Normal operation
** Self Clearing
1 = Full-Duplex (for Loopback test only)
0 = Half-Duplex
1 = Enable COL test signal
0 = Disable COL test signal
Write as 0, ignore on read
When read, 1= reset in process
Am79C901A
Description
Read/
Write
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
Default
Value
(hex)
0
0
0
0
0
1
0
0
0
0