TSS461C datasheet(41/57 Pages) ATMEL

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TSS461C

4193G–AUTO–12/04

Figure 23. Message Status Updating

Message Data (String

Pointed by: Message

Pointer Register + 1)

DATA0 is the first received (or transmitted) byte, DATAn is the last one.

Notes:

1. If the length reserved (in the message length & status register) for an incoming frame

is 2 bytes greater or more, the TSS461C will write the 2 bytes of the CRC field in the

message string just after DATAn.

Because the VAN frame does not contain a message length, the only way for the

component to know the length of the DATA field is either the message length register

value, or the EOD field detection. When the reserved length is too large, at the

moment when it detects the EOD, the TSS461C has already written the 2 bytes of the

CRC field, considering these bytes as normal DATA.

2. The Mailbox RAM area is a circular buffer. The next location after 0xFF is 0x80.

Data Frame

Immediate

I, P

Frame Type

Node x

Message Status on Node A after IT(*)

Commu-

Node A

RAK

RNW

RTR

Length

Value

I, C

RAK

RNW

RTR

Deferred

Value

I, C

RAK

RNW

RTR

Data Frame

I, P

Immediate

I, C

RAK

RNW

RTR

Length

Deferred

I, C

RAK

RNW

RTR

Length

previous values

P: Producer

I: Initiator

C: Consumer

(*) After IT ROK or RNOK. In case of IT RE, the values can be erroneous.

nication

7654321

DATAn

- - -

-- - -

- - -

DATA0

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