TSS463B datasheet(43/59 Pages) ATMEL

43 / 59 page

TSS463B

4102E–AUTO–12/04

Figure 29. Message Status Updating

Note:

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

Message Data (String

Pointed by: Message

Pointer Register + 1)

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

Note:

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

frame is 2 bytes greater or more, the TSS463B 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 TSS463B

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

nication

7654321

DATAn

- - -

-- - -

- - -

DATA0

TSS463B Datasheet(PDF) 43 Page - ATMEL Corporation

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