AM79C901AVCT datasheet(52/90 Pages) AMD

52 / 90 page

Am79C901A

PR ELI M IN AR Y

HPR20 and HPR21: HomePNA PHY RxCOMM Registers (Registers 20 and 21)

Table 29.

HPR20 and HPR21: HomePNA PHY RxCOMM Registers (Registers 20 and 21)

The 32-bit received data field 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 of the

received packets will not overwr ite the register

contents. A non-null received PCOM will set the

RxPCOM Valid bit of the Event Status Register

(HPR26). Accessing the high word of the register

clears this bit and allows overwriting of the register

by subsequent received packets.

HPR22: HomePNA PHY AID Register (Register 22)

Table 30.

HPR22: HomePNA PHY AID Register (Register 22)

The PHY’s AID address is used for collision detec-

tion. Unless bit 7 of the CONTROL register is set,

the PHY is assured to select a unique AID address.

Addresses above EFh are reserved. Address FFh is

defined to indicate a remote command.

HPR23: HomePNA PHY Noise Control Register (Register 23)

Table 31.

HPR23: HomePNA PHY Noise Control Register (Register 23)

Bits

Name

Description

Read/Write

Default

Value

(hex)

15:0

PHY_RX_COMM (4)

The 32-bit preamble received by the HomePNA

PHY. HPR20 contains the high word and HPR21 the

low word.

R0000

Bits

Name

Description

Read/Write

Default

Value

(hex)

15:8

PHY_AID

The Access ID of this PHY.

If PHY_Control Disable AID Negotiation is set, then

writes to this bit will have no effect.

R/W

7:0

Noise Events

An 8-bit counter that records the number of noise

events detected. Overflows are held as FFh. Can be

cleared by setting bit 6 of HPR16.

R/W

Bits

Name

Description

Read/

Write

Default

Value

(hex)

15:8

Noise Floor

If the input NOISE measurement (HPR25, bits 15:8)

exceeds the PEAK measurement (HPR25, bits 7:0),

this value is loaded into the NOISE Level register

HPR25, bits 15:8.

R/W

7:0

Noise Ceiling

If the input NOISE measurement (HPR25, bits 15:8)

exceeds the PEAK measurement (HPR25, bits 7:0),

this value is loaded into the NOISE Level register

HPR25, bits 7:0.

R/W

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