TSS461C datasheet(39/57 Pages) ATMEL

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TSS461C

4193G–AUTO–12/04

Mailbox

The mailbox contains all the messages received or to be transmitted. Each messages is

link to a channel. The Mailbox RAM area has 128 bytes and is mapped from 0x80 to

0xFF (see Section “Mapping”).

The message (or message buffer) is composed of:

•

1 byte of message status (only used in receiving)

•

Bytes of data. These data are the bytes of the DATA field of the frame with the same

organization.

The message is pointed by the Message Pointer Register of the channel, the length of

the message is given by the Message Length & Status Register of the channel

(Section “Message Pointer Register” and Section “Message Length And Status Regis-

ter”). This area is a pure RAM, it contains a random value after reset.

Figure 21. Message Buffer Structure for Reception

Note:

Received DATA Frame, immediate or deffered reply

CHER CHTx

CHRx

Message Pointer Register

DRAK

M_P [6..0]

Message Length & Status Register

M_L [4..0]

RTR

RNW

RAK

M_L [4..0] = n+1

received

DATA 0

Message

ID [11..0]

SOF

DATA 0

DATA n

FCS

EOF

received

DATA n

Received

M_P + 0x80 + n + 2

M_P + 0x80

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