LLCC68 datasheet(44/111 Pages) SEMTECH

44 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

44 of 111

Semtech

LLCC68

www.semtech.com

6.2.3.5 CRC

The LLCC68 offers full flexibility to select the polynomial and initial value of the selected polynomial. In additions, the user can also select a

complete inversion of the computed CRC to comply with some international standards.

The CRC can be enabled and configured by using the CRCType field in the command SetPacketParam(...). This field allows the user to

enable and select the length and configuration of the CRC.

The CRC selected must be modified together with the CRC initial value and CRC polynomial.

This flexibility permits the user to select any standard CRC or to use his own CRC allowing a specific detection of a given packet. Examples:

To use the IBM CRC configuration, the user must select:

• 0x8005 for the CRC polynomial

• 0xFFFF for the initial value

• CRC_2_BYTE for the field CRCType in the command SetPacketParam(...).

For the CCIT CRC configuration the user must select:

• 0x1021 for the CRC polynomial

• 0x1D0F for the initial value

• CRC_2_BYTE_INV for the field CRCType in the command SetPacketParam(...)

Table 6-7: CRC Type Configuration

CRCType

Description

0x01

CRC_OFF (No CRC)

0x00

CRC_1_BYTE (CRC computed on 1 byte)

0x02

CRC_2_BYTE (CRC computed on 2 bytes)

0x04

CRC_1_BYTE_INV (CRC computed on 1 byte and inverted)

0x06

CRC_2_BYTE_INV (CRC computed on 2 bytes and inverted)

Table 6-8: CRC Initial Value

Default Value

CRC MSB Initial Value [15:8]

0x06BC

0x1D

CRC LSB Initial Value [7:0]

0x06BD

0x0F

Table 6-9: CRC Polynomial

Default Value

CRC MSB Polynomial Value [15:8]

0x06BE

0x10

CRC LSB Polynomial Value [7:0]

0x06BF

0x21

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