AM79C901AVCT datasheet(51/90 Pages) AMD

51 / 90 page

Am79C901A

PR ELI M IN AR Y

HPR17: HomePNA PHY Status/Control Register (Register 17)

The HomePNA PHY Status/Control Register pro-

vides information regarding the global aspects of the

operation of the PHY.

Table 27.

HPR17: HomePNA PHY Status/Control Register (Register 17)

HPR18 and HPR19: HomePNA PHY TxCOMM

Registers (Registers 18 and 19)

Table 28.

HPR18 and HPR19: HomePNA PHY TxCOMM Registers (Registers 18 and 19)

The 32-bit transmitted data field is to be used for out-

of-band communication between PHY management

entities. No protocol for out-of-band management has

been defined. Accessing the low word causes the PHY

to send all-0 PCOMs until the high word has been ac-

cessed. Once accessed, the next transmitted packet

will cause this register’s contents to be shifted out in the

PCOM field of the transmitted packet. Upon transmis-

sion, this register will read back as all 0s. A non-null

transmitted PCOM will set the TxPCOM Ready bit in

the Event Status Register (HPR26). An access to any

of the two TxPCOM words will clear the TxPCOM

Ready bit in the ISTAT register.

Bits

Name

Description

Read/Write

Default

Value

(hex)

15:13

Reserved

Test control bits. Reads will produce undefined

results. Should be written as 0.

R00

any1Home_ Disable

1 = any1Home Link packet disabled

0 = any1Home Link packet enabled

R/W

11:8

Reserved

Test control bits. Reads will produce undefined

results. Should be written as 0.

Reserved

Test control bit. Reads will produce undefined

results. Should be written as 0.

Received_Power

1 = Last packet received, was sent at High Power

0 = Last packet received, was sent at Low Power

Received_Speed

1 = Last packet received, was sent at High Speed

0 = Last packet received, was sent at Low Speed

Received_Ver

1 = Last packet received, was sent at Version XX

0 = Last packet received, was sent at Version 0

3:0

Reserved

Test control bits. Reads will produce undefined

results. Should be written as 0.

Bits

Name

Description

Read/Write

Default

Value

(hex)

15:0

PHY_TX_COMM (4)

The 32-bit preamble transmitted on the HomePNA

PHY. HPR18 contains the high word and HPR19 the

low word.

R/W

0000

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