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AM79C978VC/W 数据表(PDF) 189 Page - Advanced Micro Devices

部件名 AM79C978VC/W
功能描述  Single-Chip 1/10 Mbps PCI Home Networking Controller
PDF  261 Pages
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM79C978VC/W 数据表(HTML) 189 Page - Advanced Micro Devices

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Am79C978
189
TBR0: 10BASE-T PHY Control Register (Register 0)
Table 65.
TBR0: 10BASE-T PHY Control Register (Register 0)
Notes:
1. R/W = Read/Write, SC = Self Clearing, RO = Read only.
2. Soft Reset does not reset the PDX block. Refer to the Soft Reset Section for details.
3. Bits 8 and 13 have no effect if Auto-Negotiation is enabled (Bit 12 = 1).
4. If the ISOL pin of the chip and the Isolate bit in Register 0 is 1, this bit will be set.
Reg
Bits
Name
Description
Read/Write
(Note 1)
Default
Value
Soft
Reset
0
15
Soft Reset (Note 2)
When write: 1 = PHY software reset,
0 = normal operation.
When read: 1 = reset in process,
0 = reset done.
R/W, SC
0
0
014
Loopback
0 = asserts Loopback mode,
1 = deasserts Loopback mode
R/W
0
0
013
Speed Selection
(Note 3)
1 = 100 Mbps,
0 = 10 Mbps
R/W
1
1
012
Auto-Negotiation
Enable
1 = enable Auto-Negotiation,
0 = disable Auto-Negotiation
R/W
1
1
0
11
Power Down
1 = power down,
0 = normal operation
R/W
0
0
010
Isolate
(Note 4)
1 = electrically isolate PHY
0 = normal operation
R/W
1
1
09
Restart Auto-
Negotiation
1 = restart Auto-Negotiation,
0 = normal operation
R/W, SC
0
0
08
Duplex Mode
(Note 3)
1 = Full-Duplex,
0 = Half-Duplex
R/W
1
Retains
previous
value
0
7
Collision Test
1 = enable COL signal test,
0 = disable COL signal test
R/W
0
0
0
6-0
Reserved
Write as 0, ignore on read
RO
0
0



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