Gpcrc - General Purpose Cyclic Redundancy Check; Introduction; Features - Silicon Laboratories EFR32xG21 Wireless Gecko Reference Manual

14. GPCRC - General Purpose Cyclic Redundancy Check

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14.1 Introduction

The GPCRC module implements a Cyclic Redundancy Check (CRC) function. It supports both 32-bit and 16-bit polynomials. The sup-
ported 32-bit polynomial is 0x04C11DB7(IEEE 802.3), while the 16-bit polynomial can be programmed to any value, depending on the
needs of the application. Common 16-bit polynomials are 0x1021 (CCITT-16), 0x3D65 (IEC16-MBus), and 0x8005 (zigbee, 802.15.4,
and USB).

14.2 Features

• Programmable 16-bit polynomial, fixed 32-bit polynomial
• Byte-level bit reversal for the CRC input
• Byte-order reorientation for the CRC input
• Word or half-word bit reversal of the CRC result
• Ability to configure and seed an operation in a single register write
• Single-cycle CRC computation for 32-, 16-, or 8-bit blocks
• DMA operation
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GPCRC - General Purpose Cyclic Redundancy Check
Quick Facts
What?
The GPCRC is an error-detecting module commonly
used in digital networks and storage systems to de-
tect accidental changes to data.
Why?
The GPCRC module can detect errors in data, giv-
ing a higher system reliability and robustness.
How?
Blocks of data entering GPCRC module can have a
short checksum, based on the remainder of a poly-
nomial division of their contents; on retrieval the cal-
culation is repeated, and corrective action can be
taken against presumed data corruption if the check
values do not match.
Reference Manual
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