AN2761 Freescale Semiconductor / Motorola, AN2761 Datasheet

AN2761

Manufacturer Part Number

AN2761

Description

Understanding Cryptographic Performance

Manufacturer

Freescale Semiconductor / Motorola

Datasheet

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Freescale Semiconductor

Application Note

Understanding Cryptographic

Performance

by: Matthew Short and Geoffrey Waters

1.1

Freescale Semiconductor defines cryptographic raw performance as the bandwidth of a cryptographic

execution unit as measured from the unit’s input FIFO, through the algorithm accelerator, and into the

unit’s output FIFO. This number assumes that the execution unit has been set up prior to measurement and

varies only as a function of operating frequency and the execution unit selected. When multiple operations

are performed on the same data (encryption and authentication), the measurement is made from the input

FIFO of the first execution unit to the output FIFO of the second.

1.2

Bus limited performance is cryptographic throughput as measured from the time a cryptographic hardware

unit’s DMA begins reading external memory, to the time the DMA has placed final data and context in

external memory. The latency of each bus transaction is assumed to be the relatively worst case for every

transaction and does not necessarily take into account the pipelined nature of the bus architecture. For

Freescale Semiconductor’s security architecture, this performance benchmark includes the fetch of

descriptors, encryption keys, IVs, HMAC keys, and plaintext, and the write back of ciphertext, the HMAC,

any preserved context, and a DONE write back. The measurement varies as a function of bus frequency

and packet size but is not a function of the execution unit selected. It should also encompass DRAM

latency, memory controller characteristics, and bus arbitration mechanism. The performance should then

This document contains information on a new product. Specifications and information herein

are subject to change without notice.

NCSG

Performance Methodology

Raw Performance

Bus Limited Performance

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

Rev. 0, 6/2004

AN2761

Related parts for AN2761

AN2761 Summary of contents

Page 1

... The performance should then This document contains information on a new product. Specifications and information herein are subject to change without notice. © Freescale Semiconductor, Inc., 2004. All rights reserved. For More Information On This Product, Go to: www.freescale.com AN2761 Rev. 0, 6/2004 ...

Page 2

Freescale Semiconductor, Inc. Coldfire Security Performance be scaled by the percentage of the bus that can be allocated to cryptographic processing, usually between 10% to 33%. 1.3 CPU Limited Performance CPU limited performance takes into consideration the instructions per packet ...

Page 3

Freescale Semiconductor, Inc. THIS PAGE INTENTIONALLY LEFT BLANK Understanding Cryptographic Performance, Rev. 0 Freescale Semiconductor For More Information On This Product, Go to: www.freescale.com Coldfire Security Performance 3 ...

Page 4

... Learn More: For more information about Freescale Semiconductor products, please visit http://motorola.com/semiconductors AN2761 Rev. 0, 6/2004 For More Information On This Product, Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document ...

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