TSS463B datasheet(45/59 Pages) ATMEL

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TSS463B

4102E–AUTO–12/04

The second case is that another module on the bus replies with an in-frame reply. In this

case the message type will pass immediately into the after reception state, without pass-

ing the after transmission state.

In the third case the TSS463B has not yet started to transmit the reply request, when

another module either requests a reply, and gets it, or transmits a deferred reply. Warn-

ing! This should be avoided as it may result in an illegal message type (Illegal reply

Request).

The immediate Reply Message will attempt to transmit an in-frame reply, using the data

in the message buffer.

Above a Deferred Reply Message is shown. This message type will immediately trans-

mit a deferred reply frame.

Finally there is the Reply Request Detector Message type. Its purpose is to receive a

reply request frame and notify the processor, without transmitting an in-frame reply.

The table above shows all inactive messages types. The last combination will transmit a

reply request, but will not receive the reply since its buffer is tagged as occupied.

Reply Request Message without transmission

RNW

RTR

CHTx

CHRx

Initial setup

Don’t care

After reception

Unchanged

Immediate Reply Message

RNW

RTR

CHTx

CHRx

Initial setup

After transmission

Deferred Reply Message

RNW

RTR

CHTx

CHRx

Initial setup

After reception

(of reply request)

Reply Request Detection Message

RNW

RTR

CHTx

CHRx

Initial setup

After reception

Inactive Message

RNW

RTR

CHTx

CHRx

Recommended

Don’t care

After transmission

Don’t care

After reception

Don’t care

Illegal reply request

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