Datasheet

Message RAM

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26.5.5 ECC RAM

On devices with SECDED implementation for the message RAM, the ECC bits are stored in a dedicated

ECC RAM area which is memory mapped as follows: The location of the ECC bits for a particular

message object in RAM is: Message RAM base address + 0x1000 + (message object number) * 0x20.

NOTE: ’0’ is not a valid message object number. At address 0x1000, the ECC bits of the last

implemented message object are located.

As shown in Figure 26-7, the ECC bits for the last implemented Message Object (here: 128) are located at

offset 0x1000; the ECC bits for Message Object 1 are located at offset 0x1020, and the ECC bits for

Message Object 127 are located at offset 0x1FE0. The ECC RAM is only memory mapped if SECDED

diagnostic mode is enabled.

Figure 26-7. ECC RAM Representation

Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Reserved

Msg RAM base +

0x1000

Reserved ECC[8:0] last implemented Message Object (here: 128)

Reserved

Msg RAM base +

0x1020

Reserved ECC[8:0] Message Object 1

Reserved

Msg RAM base +

0x1FE0

Reserved ECC[8:0] Message Object 127

1158

Controller Area Network (DCAN) Module SPNU562–May 2014

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