AM79C901AVCT datasheet(56/90 Pages) AMD

56 / 90 page

Am79C901A

PR ELI M IN AR 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 reser ved 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

10:8

Reserved

Reserved. Must be written as 0.

R/W

Force_Link_Valid

1 = Link Status bit will be held valid

0 = Normal operation

R/W

6:0

Reserved

Reserved. Must be written as 0.

R/W

Address

Symbol

Name

Basic/Extended

Default Value After

H_RESET

TBR0

PHY Control Register

1500h

TBR1

PHY Status Register

1xx9h

TBR2

PHY Identifier Register

0000h

TBR3

PHY Identifier Register

6B71h

TBR4

Auto-Negotiation Advertisement Register

0061h

TBR5

Auto-Negotiation Link Partner Ability Register

0000h

TBR6

Auto-Negotiation Expansion Register

0004h

TBR7

Auto-Negotiation Next Page Register

2001h

8:15

TBR8-TBR15

Reserved

–

TBR16

Status and Enable Register

0000h

TBR17

PHY Control/Status Register

0001h

TBR18

Reserved

–

TBR19

PHY Management Extension Register

–

20:23

TBR20-TBR23

Reserved

–

TBR24

Summary Status Register

0000h

25:31

TBR25-TBR31

Reserved

–

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