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| 型號： | HOME |
| 英文描述： | Home PHY Single-Chip 1/10Mbps Home Networking PHY? - (PDF) |
| 中文描述： | 首頁PHY的單芯片1/10Mbps家庭網絡物理層？ - （PDF格式） |
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56
Am79C901A
P R E L I M I N A R Y
HPR31: HomePNA PHY Analog Control Register (Register 31)
Table 39.
HPR31: HomePNA PHY Analog Control Register (Register 31)
10BASE-T PHY Management Registers (TBRs)
The Am79C901A home networking device supports
the MII basic register set and extended register set.
Both sets of registers are accessible through the MII
management interface or via the SPI interface. As
specified in the IEEE standard, the basic register set-
Status Register (Register 1). The extended register set
consists of the Control Register (Register 0) and the
consists of Registers 2 to 31 (decimal).
Table 40 lists all the 10BASE-T registers imple-
mented in the device. All the reserved registers
should not be written to, and reading them will return
an undetermined value.
Table 40.
10BASE-T PHY Management Registers (TBRs)
Bits
Name
Description
Read/
Write
Default
Value
(hex)
15:11
Level_Adjust
Global output slope adjustment. These bits control
the number of current sources enabled for transmit.
Each bit represents a single current source. Thus
10101 enables three current sources as does
11100.
R/W
18
10:8
Reserved
Reserved. Must be written as 0.
R/W
0
7
Force_Link_Valid
1 = Link Status bit will be held valid
0 = Normal operation
R/W
0
6:0
Reserved
Reserved. Must be written as 0.
R/W
0
Register
Address
Symbol
Name
Basic/Extended
Default Value After
H_RESET
0
TBR0
PHY Control Register
B
1500h
1
TBR1
PHY Status Register
B
1xx9h
2
TBR2
PHY Identifier Register
E
0000h
3
TBR3
PHY Identifier Register
E
6B71h
4
TBR4
Auto-Negotiation Advertisement Register
E
0061h
5
TBR5
Auto-Negotiation Link Partner Ability Register
E
0000h
6
TBR6
Auto-Negotiation Expansion Register
E
0004h
7
TBR7
Auto-Negotiation Next Page Register
E
2001h
8:15
TBR8-TBR15
Reserved
E
–
16
TBR16
Status and Enable Register
E
0000h
17
TBR17
PHY Control/Status Register
E
0001h
18
TBR18
Reserved
E
–
19
TBR19
PHY Management Extension Register
E
–
20:23
TBR20-TBR23
Reserved
E
–
24
TBR24
Summary Status Register
E
0000h
25:31
TBR25-TBR31
Reserved
E
–
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