CRC_CTRL field descriptions (continued)
Field
Description
24
TCRC
Width of CRC protocol.
0
16-bit CRC protocol.
1
32-bit CRC protocol.
23–0
Reserved
This read-only field is reserved and always has the value zero.
31.3 Functional description
31.3.1 CRC initialization/re-initialization
To enable the CRC calculation, the user must program the WAS, POLYNOMIAL, and
necessary parameters for transpose and CRC result inversion in the applicable registers.
Asserting the CTRL[WAS] bit enables the programming of the seed value into the CRC
data register.
After a completed CRC calculation, re-asserting the CTRL[WAS] bit and programming a
seed (whether the value is new or a previously used seed value) re-initialize the CRC
module for a new CRC computation. All other parameters must be set before
programming the seed value and subsequent data values.
31.3.2 CRC calculations
In 16-bit and 32-bit CRC modes, data values can be programmed 8 bits, 16 bits, or 32 bits
at a time, provided all bytes are contiguous. Non-contiguous bytes can lead to an
incorrect CRC computation.
31.3.2.1 16-bit CRC
Compute a 16-bit CRC with the following steps:
1. Clear the CTRL[TCRC] bit to enable 16-bit CRC mode.
2. Program the transpose and complement options in the CTRL register as required for
for details.
3. Write a 16-bit polynomial to the GPOLY[LOW] field. The GPOLY[HIGH] field is
not usable in 16-bit CRC mode.
4. Set the CTRL[WAS] bit to program the seed value.
Functional description
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
768
Freescale Semiconductor, Inc.
Содержание K53 Series
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