Granted Patent B2

US 12,388,655 · App. 18/361,261 · Granted Aug 12, 2025

Inventors: Vladimir Dolzhenko (Loughborough, GB); Håkan Lars-Göran Persson (Bjärred, SE)

Assignee: Arm Limited

H04L9/3247H04N19/124H04N19/172

Abstract

Claims (80)

1. A method of operating a data processing system that comprises:

an encoder operable to compress data; and

a communication system operable to transfer data compressed by the encoder;

the method comprising:

the encoder compressing data to produce compressed data;

decompressing compressed data produced by the encoder to produce first decompressed data;

generating a first signature representative of the first decompressed data;

the communication system transferring compressed data produced by the encoder;

decompressing compressed data that has been transferred by the communication system to produce second decompressed data;

generating a second signature representative of the second decompressed data;

comparing the first signature and the second signature; and

using the comparison to determine whether an error has occurred.

2. The method of claim 1 , wherein the encoder compressing data comprises the encoder lossily compressing the data.

3. The method of claim 1 , wherein the encoder compressing data comprises:

the encoder lossily compressing the data to produce lossily compressed data, and then losslessly compressing the lossily compressed data; and

wherein decompressing compressed data produced by the encoder to produce first decompressed data, and generating a first signature representative of the first decompressed data comprises:

decompressing the lossily compressed data to produce lossily decompressed data, and generating the first signature to be representative of the lossily decompressed data.

4. The method of claim 3 , wherein lossily compressing the data comprises transforming the data to produce transformed data, and then quantizing the transformed data; and

wherein losslessly compressing the lossily compressed data comprises entropy encoding the quantized data.

5. The method of claim 1 , wherein the encoder compressing data comprises the encoder performing the step of decompressing compressed data produced by the encoder.

6. The method of claim 5 , wherein the encoder is a video encoder operable to compress video data by decompressing a previous encoded frame, and comparing a current frame with the decompressed previous encoded frame.

7. The method of claim 1 , comprising the communication system transferring the first signature together with the compressed data produced by the encoder.

8. The method of claim 7 , wherein transferring the first signature together with the compressed data produced by the encoder comprises storing the first signature in a header, and storing the compressed data as associated body data.

9. The method of claim 1 , wherein the data processing system comprises one or more processing units, the communication system comprises a communication bus and a memory, and the method comprises:

in response to a processing unit of the one or more processing units issuing a write transaction request on the bus:

the encoder compressing data generated by the processing unit to produce compressed data;

decompressing compressed data produced by the encoder to produce the first decompressed data;

generating the first signature representative of the first decompressed data; and

storing compressed data produced by the encoder and the first signature in the memory; and

in response to a processing unit of the one or more processing units issuing a read transaction request on the bus:

reading the compressed data and the first signature stored in the memory;

decompressing the read compressed data to produce the second decompressed data;

generating the second signature representative of the second decompressed data;

comparing the first signature and the second signature; and

using the comparison to determine whether an error has occurred.

10. A data processing system comprising:

an encoder operable to compress data; and

a communication system operable to transfer data compressed by the encoder;

wherein the data processing system is operable to:

decompress compressed data produced by the encoder to produce first decompressed data;

generate a first signature representative of the first decompressed data;

decompress compressed data that has been transferred by the communication system to produce second decompressed data;

generate a second signature representative of the second decompressed data;

compare the first signature and the second signature; and

use the comparison to determine whether an error has occurred.

11. The system of claim 10 , wherein the encoder is operable to compress data by lossily compressing the data.

12. The system of claim 10 , wherein the encoder is operable to compress data by:

lossily compressing the data to produce lossily compressed data, and then losslessly compressing the lossily compressed data; and

wherein the system is operable to decompress compressed data produced by the encoder to produce first decompressed data, and generate a first signature representative of the first decompressed data by:

decompressing the lossily compressed data to produce lossily decompressed data, and generating the first signature to be representative of the lossily decompressed data.

13. The system of claim 12 , wherein lossily compressing the data comprises transforming the data to produce transformed data, and then quantizing the transformed data; and

wherein losslessly compressing the lossily compressed data comprises entropy encoding the quantized data.

14. The system of claim 10 , wherein the encoder is operable to compress data by decompressing compressed data produced by the encoder.

15. The system of claim 14 , wherein the encoder is a video encoder operable to compress video data by decompressing a previous encoded frame, and comparing a current frame with the decompressed previous encoded frame.

16. The system of claim 10 , wherein the communication system is operable to transfer the first signature together with compressed data produced by the encoder.

17. The system of claim 16 , wherein the communication system is operable to transfer the first signature together with compressed data produced by the encoder by storing the first signature in a header, and storing the compressed data as associated body data.

18. The system of claim 10 , wherein the data processing system comprises one or more processing units, the communication system comprises a communication bus and a memory, and the system is operable to:

in response to a processing unit of the one or more processing units issuing a write transaction request on the bus:

compress, by the encoder, data generated by the processing unit to produce compressed data;

decompress compressed data produced by the encoder to produce the first decompressed data;

generate the first signature representative of the first decompressed data; and

store compressed data produced by the encoder and the first signature in the memory; and

in response to a processing unit of the one or more processing units issuing a read transaction request on the bus:

read the compressed data and the first signature stored in the memory;

decompress the read compressed data to produce the second decompressed data;

generate the second signature representative of the second decompressed data;

compare the first signature and the second signature; and

use the comparison to determine whether an error has occurred.

19. A non-transitory computer readable storage medium storing software code which when executing on a processor performs a method of operating a data processing system that comprises:

an encoder operable to compress data; and

a communication system operable to transfer data compressed by the encoder;

the method comprising:

the encoder compressing data to produce compressed data;

decompressing compressed data produced by the encoder to produce first decompressed data;

generating a first signature representative of the first decompressed data;

the communication system transferring compressed data produced by the encoder;

decompressing compressed data that has been transferred by the communication system to produce second decompressed data;

generating a second signature representative of the second decompressed data;

comparing the first signature and the second signature; and

using the comparison to determine whether an error has occurred.

Assignments (1)

Continuity (1)

References Cited (17)