AM79C901AJCT AMD [Advanced Micro Devices], AM79C901AJCT Datasheet - Page 56

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

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
56
15:11
Bits
10:8
6:0
Register
Address
7
20:23
25:31
8:15
16
17
18
19
24
0
1
2
3
4
5
6
7
Level_Adjust
Reserved
Force_Link_Valid
Reserved
TBR20-TBR23
TBR25-TBR31
Table 39. HPR31: HomePNA PHY Analog Control Register (Register 31)
TBR8-TBR15
Symbol
TBR16
TBR17
TBR18
TBR19
TBR24
TBR0
TBR1
TBR2
TBR3
TBR4
TBR5
TBR6
TBR7
Name
Table 40. 10BASE-T PHY Management Registers (TBRs)
PHY Control Register
PHY Status Register
PHY Identifier Register
PHY Identifier Register
Auto-Negotiation Advertisement Register
Auto-Negotiation Link Partner Ability Register
Auto-Negotiation Expansion Register
Auto-Negotiation Next Page Register
Reserved
Status and Enable Register
PHY Control/Status Register
Reserved
PHY Management Extension Register
Reserved
Summary Status Register
Reserved
P R E L I M I N A R Y
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.
Reserved. Must be written as 0.
1 = Link Status bit will be held valid
0 = Normal operation
Reserved. Must be written as 0.
Am79C901A
Name
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.
Description
Basic/Extended
B
B
E
E
E
E
E
E
E
E
E
E
E
E
E
E
Read/
Write
Default Value After
R/W
R/W
R/W
R/W
H_RESET
1500h
0000h
6B71h
0061h
0000h
0004h
2001h
0000h
0001h
0000h
1xx9h
–
–
–
–
–
Default
Value
(hex)
18
0
0
0