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Field
31–30
Type Of Transpose For Writes
TOT
Defines the transpose configuration of the data written to the CRC data register. See the description of the
transpose feature for the available transpose options.
00
No transposition.
01
Bits in bytes are transposed; bytes are not transposed.
10
Both bits in bytes and bytes are transposed.
11
Only bytes are transposed; no bits in a byte are transposed.
29–28
Type Of Transpose For Read
TOTR
Identifies the transpose configuration of the value read from the CRC Data register. See the description of
the transpose feature for the available transpose options.
00
No transposition.
01
Bits in bytes are transposed; bytes are not transposed.
10
Both bits in bytes and bytes are transposed.
11
Only bytes are transposed; no bits in a byte are transposed.
27
This field is reserved.
Reserved
This read-only field is reserved and always has the value 0.
26
Complement Read Of CRC Data Register
FXOR
Some CRC protocols require the final checksum to be XORed with 0xFFFFFFFF or 0xFFFF. Asserting
this bit enables on the fly complementing of read data.
0
No XOR on reading.
1
Invert or complement the read value of the CRC Data register.
25
Write CRC Data Register As Seed
WAS
When asserted, a value written to the CRC data register is considered a seed value. When deasserted, a
value written to the CRC data register is taken as data for CRC computation.
0
Writes to the CRC data register are data values.
1
Writes to the CRC data register are seed values.
24
Width of CRC protocol.
TCRC
0
16-bit CRC protocol.
1
32-bit CRC protocol.
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
33.3 Functional description
Freescale Semiconductor, Inc.
CRC_CTRL field descriptions
Description
KV4x Reference Manual, Rev. 2, 02/2015
Preliminary
Chapter 33 Cyclic redundancy check (CRC)
655
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