Datasheet

1059
SAM9263 [DATASHEET]
Atmel-6249N-ATARM-SAM9263-Datasheet_14-Mar-16
50.1.5 CAN
50.1.5.1 CAN: Low Power Mode and Error Frame
If the Low Power Mode is activated while the CAN is generating an error frame, this error frame may be shortened.
Problem Fix/Workaround
None
50.1.5.2 CAN: Low Power Mode and Pending Transmit Messages
No pending transmit messages may be sent once the CAN Controller enters Low-power Mode.
Problem Fix/Workaround
Check that all messages have been sent by reading the related Flags before entering Low-power Mode.
50.1.5.3 CAN: Contents of Mailbox 0 can be sent Even if Mailbox is Disabled
When a transmit request (on a mailbox other than mailbox 0) is done simultaneously with the RX line going low,
the CAN may send the contents of mailbox 0 even if this mailbox is disabled or has been set in reception.
The contents of mailbox 0 are sent, followed by the mailbox which is supposed to be sent.
Note that this is unlikely to happen and only occurs with a high bus load.
In this case, when the CAN attempts to send mailbox 0, the mailbox 0 ID is used for arbitration. If arbitration is lost,
the send request for mailbox 0 is canceled, else the contents of mailbox 0 are sent. The original transmit request is
correctly handled afterwards.
Problem Fix/Workaround
Two workarounds:
1. Do not use mailbox 0 and program an unused identifier (example: 0x7FF) which will not affect the CAN bus.
The spurious emission may happen but the impact on the bus will be minimized.
Or:
2. Use only mailbox 0 to transmit and no other mailboxes. In this case, there will be no spurious emission on
the CAN bus.
50.1.6 ECC
50.1.6.1 ECC status may be wrong with external SRAM
When the data bus width is different for an SRAM on any EBI NCS and the NAND Flash, the ECC status is wrong.
A single error is seen as a multiple error and is not corrected.This does not occur with SDRAM.
Problem Fix/Workaround
None.
50.1.7 EMACB
50.1.7.1 Transmit Underrun Errors
EMACB FIFO internal arbitration scheme is:
1. Receive buffer manager write
2. Receive buffer manager read
3. Transmit data DMA read
4. Receive data DMA write
5. Transmit buffer manager read
6. Transmit buffer manager write