Chapter 33 Cyclic Redundancy Check (Crc); Block Diagram - NXP Semiconductors freescale KV4 Series Reference Manual

Chapter 33
Cyclic redundancy check (CRC)
33.1 Introduction
The cyclic redundancy check (CRC) module generates 16/32-bit CRC code for error
detection.
The CRC module provides a programmable polynomial, WAS, and other parameters
required to implement a 16-bit or 32-bit CRC standard.
The 16/32-bit code is calculated for 32 bits of data at a time.
33.1.1 Features
Features of the CRC module include:
• Hardware CRC generator circuit using a 16-bit or 32-bit programmable shift register
• Programmable initial seed value and polynomial
• Option to transpose input data or output data (the CRC result) bitwise or bytewise.
This option is required for certain CRC standards. A bytewise transpose operation is
not possible when accessing the CRC data register via 8-bit accesses. In this case, the
user's software must perform the bytewise transpose function.
• Option for inversion of final CRC result
• 32-bit CPU register programming interface

33.1.2 Block diagram

The following is a block diagram of the CRC.
Freescale Semiconductor, Inc.
KV4x Reference Manual, Rev. 2, 02/2015
Preliminary
651