TSS463-AAR ATMEL [ATMEL Corporation], TSS463-AAR Datasheet - Page 44
TSS463-AAR
Manufacturer Part Number
TSS463-AAR
Description
VAN Data Link Controller with Serial Interface
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.TSS463-AAR.pdf
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Figure 29. Message Status Updating
Message Data (string
pointed by: Message
Pointer Register + 1)
44
TSS463-AA
P: Producer
(*) After IT ROK or RNOK. In case of IT RE, the values can be erroneous.
Data Frame
Data Frame
Frame Type
Immediate
Immediate
Deferred
Deferred
Reply
Reply
Reply
Reply
DATA0 is the first received (or transmitted) byte, DATAn is the last one.
Note:
Node x
- - -
I, P
I, C
I, C
C
P
P
7
I: Initiator
1. If the length reserved (in the message length and status register) for an incoming
2. The Mailbox RAM area is a circular buffer. The next location after 0xFF is 0x80.
frame is 2 bytes greater or more, the TSS463AA will write the 2 bytes of the CRC
field in the message string just after DATAn.
Because the VAN frame does not content a message length, the only way for the
component to know the length of the DATA field is either the message length register
value, either the EOD field detection. When the reserved length is too large, at the
moment when it detects the EOD, the TSS463AA has already written the 2 bytes of
the CRC field, considering these bytes as normal DATA.
Commu-
nication
- - -
6
Node A
- - -
C: Consumer
5
I, C
I, C
I, P
C
P
P
RAK
RAK
RAK
RAK
RAK
Message Status on Node A after IT(*)
- - -
4
DATAn
DATA0
RNW
RNW
RNW
RNW
RNW
previous values
- - -
3
RTR
RTR
RTR
RTR
RTR
- - -
previous
previous
2
length
length
length
value
value
-- - -
1
4205B–AUTO–12/04
- - -
0
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