CAN Operation
17-16
ADSP-BF50x Blackfin Processor Hardware Reference
The message identifier of the received message, along with the identifier
extension (
IDE
) and remote transmission request (
RTR
) bits, are compared
against each mailbox’s register settings. If the
AME
bit is not set, a match is
signalled only if
IDE
,
RTR
, and all identifier bits are exact. If, however,
AME
is set, the acceptance mask registers determine which of the identifier,
IDE
,
and
RTR
bits need to match. The logic applies
Received Message XNOR
CAN_IDx
or
AME AND CAN_AMx
. A one at the respective bit position in the
CAN_AMxx
mask registers means that the bit does not need to match when
AME = 1
. This way, a mailbox can accept a group of messages.
If the acceptance filter finds a matching identifier, the content of the
received data frame is stored in that mailbox. A received message is stored
only once, even if multiple receive mailboxes match its identifier. If the
current identifier does not match any mailbox, the message is not stored.
Table 17-1. Mailbox Used for Acceptance Mask Filtering
Mailbox Used for Acceptance Filtering
MCn
MDn RFHn Mailbox n
Comment
0
x
x
Ignored
Mailbox n disabled
1
0
0
Ignored
Mailbox n enabled
Mailbox n configured for transmit
Remote frame handling disabled
1
0
1
Used
Mailbox n enabled
Mailbox n configured for transmit
Remote frame handling enabled
1
1
x
Used
Mailbox n enabled
Mailbox n configured for receive
Содержание EZ-KIT Lite ADSP-BF506F
Страница 50: ...Contents l ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 92: ...Development Tools 1 30 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 110: ...Interface Overview 3 12 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 132: ...Unique Information for the ADSP BF50x Processor 4 22 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 236: ...Internal Flash Memory Control Registers 6 92 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 342: ...Unique Information for the ADSP BF50x Processor 7 106 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 484: ...Unique Information for the ADSP BF50x Processor 10 60 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 493: ...ADSP BF50x Blackfin Processor Hardware Reference 11 9 Core Timer Unique Information for the ADSP BF50x Processor None ...
Страница 494: ...Unique Information for the ADSP BF50x Processor 11 10 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 506: ...Unique Information for the ADSP BF50x Processor 12 12 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 544: ...Unique Information for the ADSP BF50x Processor 13 38 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 650: ...Programming Examples 15 56 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 712: ...Unique Information for the ADSP BF50x Processor 16 62 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 804: ...Programming Examples 17 92 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 972: ...Unique Information for the ADSP BF50x Processor 20 38 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 1194: ...Programming Examples 24 90 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 1256: ...ACM Registers A 50 ADSP BF50x Blackfin Processor Hardware Reference ...
Страница 1264: ...Boundary Scan Architecture B 8 ADSP BF50x Blackfin Processor Hardware Reference ...