Download - FCE Flexible CRC Engine - Infineon
FCEFlexible CRC EngineXMC™ microcontrollersSeptember 2016
Agenda
Overview
Key feature: support 3 independent CRC polynomials
Key feature: data reflection and XOR
Key feature: signature check
System integration
Application examples
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Copyright © Infineon Technologies AG 2016. All rights reserved. 2
Agenda
Overview
Key feature: support 3 independent CRC polynomials
Key feature: data reflection and XOR
Key feature: signature check
System integration
Application examples
1
2
3
4
5
6
Copyright © Infineon Technologies AG 2016. All rights reserved. 3
FCEFlexible CRC Engine
Highlights
The FCE for the XMC™4000 microcontrollerimplements the IEEE 802.3 EthernetCRC32, the CCITT CRC16 and the SAEJ1850 CRC8 polynomials.
The primary target of FCE is to be used asa hardware acceleration engine forsoftware applications or operating systemsservices using CRC signatures.
Customer benefitsKey feature
› 3 independent CRC algorithms can beused concurrently by different softwaretasks
› No software loading to perform datareflection with and without XORoperation
› Less software through hardware lengthand checksum mismatch alerted
› Support 3 independent CRC polynomials
› Equipped with data reflection and XORfeature
› Interrupt error notification and signaturecheck
Copyright © Infineon Technologies AG 2016. All rights reserved. 4
Agenda
Overview
Key feature: support 3 independent CRC polynomials
Key feature: data reflection and XOR
Key feature: signature check
System integration
Application examples
1
2
3
4
5
6
Copyright © Infineon Technologies AG 2016. All rights reserved. 5
FCESupport 3 independent CRC polynomials
› The FCE offers 3 different independent polynomials for CRC calculations
– CRC kernel 0 and 1: IEEE 802.3 CRC32 Ethernet polynomial:0x04C11DB7
– CRC kernel 2: CCITT CRC16 polynomial: 0x1021
– CRC kernel 3: SAE J1850 CRC8 polynomial: 0x1D
› The CRC calculation of these 4 kernels can be executed in parallel, hence theycan be used concurrently by different software tasks
CRC 32-bitEthernet
IEEE 802.30x04C11DB7
CRC 32-bitEthernet
IEEE 802.30x04C11DB7
CRC Kernel 0 CRC Kernel 1
CRC 16-bit
CRC-CCITT0x1021
CRC 8-bit
SAE-J18500x1D
CRC Kernel 2 CRC Kernel 3
Copyright © Infineon Technologies AG 2016. All rights reserved. 6
Agenda
Overview
Key feature: support 3 independent CRC polynomials
Key feature: data reflection and XOR
Key feature: signature check
System integration
Application examples
1
2
3
4
5
6
Copyright © Infineon Technologies AG 2016. All rights reserved. 7
FCEEquipped with data reflection and XOR feature
› Result XOR, indicates if a final XOR operation is done before returning the CRCresult
› Data reflection feature for both input and result
– Byte wise reflection
– Bit wise reflection
Copyright © Infineon Technologies AG 2016. All rights reserved. 8
Agenda
Overview
Key feature: support 3 independent CRC polynomials
Key feature: data reflection and XOR
Key feature: signature check
System integration
Application examples
1
2
3
4
5
6
Copyright © Infineon Technologies AG 2016. All rights reserved. 9
FCE: interrupt error notification andsignature check
› CRC mismatch interrupt
– The automatic signature checkcompares the signature at the end ofa message with the expectedsignature configured in the CHECKregister
– A mismatch error interrupt willhappen if both values are different
› Length error interrupt
– The LENGTH register is configuredwith the number of words of themessage for CRC calculation
– Every time the IR register is written,the LENGTH register is decrementedby one until it reaches zero
– Length error interrupt is generated ifsoftware writes to IR register withLENGTH equal to 0
Copyright © Infineon Technologies AG 2016. All rights reserved. 10
Agenda
Overview
Key feature: support 3 independent CRC polynomials
Key feature: data reflection and XOR
Key feature: signature check
System integration
Application examples
1
2
3
4
5
6
Copyright © Infineon Technologies AG 2016. All rights reserved. 11
FCESystem integration
› Target application
– Reliable USIC communication
– Alternate boot mode
› The FCE can be combined with theUSIC and DMA module for anoptimized system solution
– The software can write into thelength and check register for autodetection of length or mismatcherror respectively
– The DMA can transfer data into theCRC input register without any CPUloading
XMC™4400 XMC™4200XMC™4500
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Agenda
Overview
Key feature: support 3 independent CRC polynomials
Key feature: data reflection and XOR
Key feature: signature check
System integration
Application examples
1
2
3
4
5
6
Copyright © Infineon Technologies AG 2016. All rights reserved. 13
Application exampleCRC for USIC communication
Transferring of data in a digitalnetwork are subjected to noiseand other disturbances which ledto accidental changes to rawdata.
Hence verification needs to bedone at the receiving end toensure data correctness.
Therefore the verification processinvolves the transmission side togenerate a CRC value which isappend into the transmit headerof a data frame.
At the receiving side, CRC isrecalculated again and it’scalculated CRC value is comparedwith the received checksum forany mismatch.
Overview
In brief
Both USIC transmit and receive modules areassigned to an independent CRC kernel forCRC generation and data verification. DMA isused to reduce CPU loading.
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Application exampleAlternate boot mode header initialization
Overview
In brief
Other than using the standard bootmode, XMC™ also allows user tocustomize its boot software in a userdefined flash memory. This is knownas alternate boot mode. The alternateboot mode header requires CRC-32polynomial calculations (04C11DB7H).
The Alternate Boot Modes (ABMs) areintended to start program codeavailable at a user-defined address, ifthe ABM header check-condition issatisfied by the start up software.
To initialize the ABM header, the FCE isused to generate the CRC results forthe application software and the first 4words of the ABM header.
Lastly the software shall write the 2CRC results into the last 2 words ofthe ABM header.
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