TSS463B datasheet(46/59 Pages) ATMEL

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TSS463B

4102E–AUTO–12/04

Priority Among the

Different Channels

The priority handling on the VAN bus itself is already explained in the Line interface sec-

tion. The priorities for the messages in the TSS463B is however slightly different.

For instance, it’s possible that an identifier matches two or more of the identifiers pro-

grammed into the registers. In this case, it is the lowest identifier number that has

priority. i.e. if both identifier 5 and 10 match the identifier received, it is the identifier 5

that will receive the message.

However, since the identifier 5 will become an inactive message when it has received

the frame, the next time the same identifier is seen on the bus, the corresponding data

will be received by identifier 10.

The same is valid for messages to be transmitted, i.e. if two or more messages are

ready to be transmitted, it is the one with the lowest identifier number that will get

priority.

Retries, Rearbitrate

and Abort

Retries and rearbitrate commands are located, respectively, in the Transmit Control

three commands are available only when the TSS463B is producer.

Figure 30. Transmit Function

Activate

Ch. Enabled in

Xmit Mode ?

Select The Lowest

Ch. Number And

Load ”Max - Retries”

Yes

Abort Activated

On Current Ch. ?

Yes

Disable of

Current Ch.

Wait For Bus Free

(EOF+IFS= 12 Timeslots)

Retry Needed ?

Abort

Abort Required

Rearbitrate?

On Current Ch.

Rearbitrate

Yes

Transmit Frame

And Wait For The End

Decrement

Retry Counter

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