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| 型號： | DM9801A |
| 文件頁數(shù)： | 49/60頁 |
| 文件大?。?/td> | 605K |
| 代理商： | DM9801A |
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DM9801A
1M Home Phoneline Network Physical Layer Single Chip Transceiver
Final
Version: DM9801A-DS-F01
May 30, 2001
49
Management Interfaces
The DM9801A may be managed from either of two
interfaces with managed parameters varying depending on
the interface:
1. Remote control-word management commands
embedded in the AID header on the wire network.
2. 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:
1. The master station is identified on the Home Phoneline
Network with an AID of 0xFF (hex).
2. The slave is identified with an AID of 0x00 (hex) to 0xEF
(hex).
3. 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:
1. SET_VERSION - Commands slave devices to operate
according to 1M Home Networking version.
2. SET_POWER - commands slave stations to set their
transmit level to a prescribed level until another master
command is received.
3. 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 #
0
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
1
2
3
Master/Slave Station Control Word Functions
Table 4
Note: Master and Slave control word bit encoding are identical.
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相關(guān)代理商/技術(shù)參數(shù) |
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