NXP Semiconductors MWCT101 S Series, Reference Manual

Page: 1644 / 1761

49.4.2.35.3 Diagram
Bits 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
Reserved
FD_MBCRC
Reserved
FD_TXCRC
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R FD_TXCRC
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
49.4.2.35.4 Fields
Field Function
31
—
Reserved
30-24
FD_MBCRC
CRC Mailbox Number for FD_TXCRC
This field indicates the number of the mailbox corresponding to the value in the FD_TXCRC field, for both
FD and non-FD frames.
It reports the same information as in CRCR[MBCRC].
23-21
—
Reserved
20-0
FD_TXCRC
Extended Transmitted CRC value
This 21-bit field contains the CRC value calculated over the most recent transmitted message. Different
CRC polynomials are used for different frame formats. A 15-bit polynomial, CRC_15, is used for all
frames in CAN format. The second 17-bit polynomial, CRC_17, is used for frames in CAN FD format with
a data field up to sixteen bytes long. The third 21-bit polynomial, CRC_21, is used for frames in CAN FD
format with a data field longer than sixteen bytes.
For CRC_15 and CRC_17, the 6 most significant bits and the 4 most significant bits are reported as
zeros, respectively.
For CRC_15, this register has the same content as CRC register.
Memory map/register definition
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
1644 NXP Semiconductors