DM9801A datasheet(49/60 Pages) DAVICOM

49 / 60 page

DM9801A

1M Home Phoneline Network Physical Layer Single Chip Transceiver

Final

Version: DM9801A-DS-F01

May 30, 2001

Management Interfaces

The DM9801A may be managed from either of two

interfaces with managed parameters varying depending on

the interface:

Remote control-word management commands

embedded in the AID header on the wire network.

Management messages from the local management

entity.

AID Header Remote Control-Word Commands

Home Phoneline Networking stations may be configured

either as master stations or slave stations. Only one master

may exist on a given Home Phoneline Network over which

the header is preserved. Operation is master station mode is

optional while operation is slave mode is a requirement.

The master station may send commands embedded in the

header control word to remotely set various parameters of

the remote slave stations. Stations are identified via the AID

as follows:

The master station is identified on the Home Phoneline

Network with an AID of 0xFF (hex).

The slave is identified with an AID of 0x00 (hex) to 0xEF

(hex).

AID values of 0xF0 to 0xFE are reserved for future use.

Once a command has been transmitted, the master station

must revert to a slave AID so that subsequent control words

are not interpreted by the slave stations as new commands.

A master remote command must consist of three frames

with an AID header of 0xFF (hex). Since the header is

appended (piggy-backed) to packets received from the

MAC that are normally transmitted independently of the

DM9801A, master control frames are transmitted only when

the MAC sends packets to the DM9801A. Therefore,

packets from the master station may be separated by long

intervals during which other (slave) stations may transmit

their frames.

A remote master Control-Word command must be

recognized and executed by a Home Phoneline Networking

PHY when it receives three consecutive valid frames with an

AID of 0xFF (hex). Valid commands are as follows:

SET_VERSION - Commands slave devices to operate

according to 1M Home Networking version.

SET_POWER - commands slave stations to set their

transmit level to a prescribed level until another master

command is received.

SET_SPEED - commands slave stations to set their

transmit speed to a prescribed value until another

master command is received.

The control word bit encoding and possible values are

described in Table 4 below.

Bit #

Indicated Status

0 = This station is version 0

1 = This station is not version 0

0 = Frame transmitted at low power

1 = Frame transmitted at high power

0 = Frame transmitted at low speed

0 = Frame transmitted at high speed

Reserved

Master/Slave Station Control Word Functions

Table 4

Note: Master and Slave control word bit encoding are identical.

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