TSS461 ATMEL Corporation, TSS461 Datasheet - Page 43

• Manufacturer Part Number: TSS461
• Description: VAN Data Link Controller
• Manufacturer: ATMEL Corporation

4194C–AUTO–01/06
Second, 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 passing the after transmission state.
Third, the TSS461E has not yet started to transmit the reply request, when another module
either requests a reply, and gets it, or transmits a deferred reply. Warning! 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. A deferred Reply Message is shown below.
This message type will immediately transmit 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.
Illegal Reply Request
After Transmission
(of Reply Request)
After Transmission
After Reception
After Reception
After Reception
After Reception
Recommended
Initial Setup
Initial Setup
Initial Setup
Initial Setup
Reply Request Message Without Transmission
Don’t Care
RNW
RNW
RNW
RNW
Reply Request Detection Message
RNW
1
1
1
1
1
1
1
1
0
0
1
Immediate Reply Message
Deferred Reply Message
Inactive Message
RTR
RTR
RTR
RTR
Don’t Care
1
1
0
0
0
0
0
0
RTR
0
1
1
Unchanged
Don’t Care
CHTx
CHTx
CHTx
CHTx
Don’t Care
0
1
0
1
1
1
CHTx
1
1
0
TSS461E
Don’t care
CHRx
CHRx
CHRx
CHRx
CHRx
0
1
0
1
1
1
0
1
1
1
1
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