XIB-E【PDF 44/64 页】BOARD INTERFACE ETHERNET

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Sheet目录58

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Initiating a Connection

Connection Guidelines:

" A remote mod

" The base mod

" A remote mod

" A connection f

whatever cond

ondition

ule can only request a connection with the base module.

ule may hold off or grant a connection request to another module.

ule will not try to establish a connection if one already exists.

ails if no response is received after RR (Retries) CRP packets. After a failure,

ition was causing a connection to be established is cleared. If the c

was data to be sent, all data in the DI buffer will be flushed. If the condition was DI3

transition, then no connection will be attempted until another correct DI3 transition.

" A global connection cannot fail. [Definition is on next page.]

Once in Multi-Streaming Mode (MD > 0), several events can initiate an exclusive connection:

1. Remote module has payload to transmit. After a remote module receives data from its host,

the module will at

ction is

tempt to establish a connection with the base module. The conne

defined by the rem

r. If another remote has a

otes D (Destination Address) paramete

connection with th

til the connection runs its

e base, o connection will be established un

course. Any remotes requesting a connection will then arbitrate for the next connection. RR

(Retries) and RN (Random back-off) parameters control this arbitration.

2. Base sets the DT (Destination Address) parameter. When the base module sets the DT

(Destination Address) parameter, an exclusive connection is immediately initiated with the

remote module that has a matching DT parameter. After the DT command is sent (If

ATCM=1), the base module indicates a successful connection with a CONNECT XXXX string

where "XXXX" is the remote's address. An unsuccessful connection is indicated with an

ERROR string. If the connection is successful, the module immediately exits AT Command

Mode and data can be sent to and received from the connected remote module. If an error is

returned, the module stays in AT Command Mode. If a base is connected to a remote when

the DT command is executed, the current connection is disconnected before a new

connection is created.

3. DI3 pin (pin 2, SLEEP) is asserted (set low). Both base and remote modules can create a

connection (defined by the current DT (Destination Address) parameter) when the DI3 pin is

asserted (driven high). DR (DI3 Configuration) Command is used to establish this mode. If a

remote asserts DI3, a connection request will be sent when no connection is active. If the

base asserts DI3, a connection will immediately be established with the remote after any

connection.

Initiating a Disconnection

o disconnect, the base module sends a DGP (disconnect grant

nly request a disconnect. The following conditions cause a disc

packet). A remote module can

onnect:

1. No over-the-air data sent or received for CE (Connection In

ver-

activity Timeout) time. If no o

the-air data is successfully sent (no acknowledgement received) or received (any good

packet) for CE time, the connection will be dropped. Only a base module can detect this

condition. Refer to CE Command.

2. Absolute CB (Connection Duration Timeout). The CB param

ute timeout.

eter defines an absol

A timer is started on the remote units when a connection is established. When the

connection has been active for CB time, the base will close the connection. A remote that

detects this condition will automatically disconnect (it will n

sconnect

ot send a DRP (di

request packet)). Remotes that monitor a connection between the base and another remote

will disregard any connection after the CB time. Refer to CB Command.

3. DI3 pin (pin 2, SLEEP) is de-asserted (set high). A base or remote module can cause a

disconnect by setting the DI3 line high. If no connection is active, the de-assertion is

ignored. A remote will request a disconnect if DI3 is de-asserted and the remote is currently

connected the base. Refer to DR (DI3 Configuration) Command.

4. A remote or a base module receives the ATDC (Disconnect) Command.

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