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33.2.1 CRC Data register (CRC_DATA)
The CRC Data register contains the value of the seed, data, and checksum. When
CTRL[WAS] is set, any write to the data register is regarded as the seed value. When
CTRL[WAS] is cleared, any write to the data register is regarded as data for general CRC
computation.
In 16-bit CRC mode, the HU and HL fields are not used for programming the seed value,
and reads of these fields return an indeterminate value. In 32-bit CRC mode, all fields are
used for programming the seed value.
When programming data values, the values can be written 8 bits, 16 bits, or 32 bits at a
time, provided all bytes are contiguous; with MSB of data value written first.
After all data values are written, the CRC result can be read from this data register. In 16-
bit CRC mode, the CRC result is available in the LU and LL fields. In 32-bit CRC mode,
all fields contain the result. Reads of this register at any time return the intermediate CRC
value, provided the CRC module is configured.
Address: 4003_2000h base + 0h offset = 4003_2000h
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
R
W
Reset
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
CRC_DATA field descriptions
Field
Description
31–24
HU
CRC High Upper Byte
In 16-bit CRC mode (CTRL[TCRC] is 0), this field is not used for programming a seed value. In 32-bit CRC
mode (CTRL[TCRC] is 1), values written to this field are part of the seed value when CTRL[WAS] is 1.
When CTRL[WAS] is 0, data written to this field is used for CRC checksum generation in both 16-bit and
32-bit CRC modes.
23–16
HL
CRC High Lower Byte
In 16-bit CRC mode (CTRL[TCRC] is 0), this field is not used for programming a seed value. In 32-bit CRC
mode (CTRL[TCRC] is 1), values written to this field are part of the seed value when CTRL[WAS] is 1.
When CTRL[WAS] is 0, data written to this field is used for CRC checksum generation in both 16-bit and
32-bit CRC modes.
15–8
LU
CRC Low Upper Byte
When CTRL[WAS] is 1, values written to this field are part of the seed value. When CTRL[WAS] is 0, data
written to this field is used for CRC checksum generation.
LL
CRC Low Lower Byte
When CTRL[WAS] is 1, values written to this field are part of the seed value. When CTRL[WAS] is 0, data
written to this field is used for CRC checksum generation.
Chapter 33 Cyclic redundancy check (CRC)
KV4x Reference Manual, Rev. 2, 02/2015
Freescale Semiconductor, Inc.
Preliminary
653
Summary of Contents for freescale KV4 Series
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