Replaceable printer component

• US 9,707,784 B2
• Filed: 05/09/2016
• Issued: 07/18/2017
• Est. Priority Date: 05/29/2008
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Panshin, Stephen D., Ward, Jefferson P., Novak, David B., McCloy, Glenn D., Helterline, Brian L.
• Primary Examiner(s): Yip, Kent
• Application Number:
  US15/149,753
• Publication Number:
  US 20160250872A1
• Time in Patent Office: 435 Days
• Field of Search: 358 114- 116
• CPC Class Codes: B41J 2/17546 electronically
• CPC Class Codes: B41J 29/38 Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
• CPC Class Codes: G03G 15/0863 provided with identifying means or means for storing process- or use parameters, e.g. an electronic memory
• CPC Class Codes: G03G 2215/0697 being an electronically readable memory
• CPC Class Codes: G03G 2221/1823 Cartridges having electronically readable memory
• CPC Class Codes: G06F 21/602 Providing cryptographic facilities or services
• CPC Class Codes: G06F 21/79 in semiconductor storage media, e.g. directly-addressable memories
• CPC Class Codes: H04L 2209/04 Masking or blinding

Abstract

A replaceable printer component includes a memory device to store a tag encryption mask and data. The data is stored in a plurality of blocks of the memory device wherein each block is defined by a tag. The tag encryption mask indicates an encryption status of each block of the memory device defined by the tag. The replaceable printer component includes a communication link to communicatively link the memory device to a printer controller when the replaceable printer component is installed in a printing system. The tag encryption mask is stored within a header of the memory device. Each tag defines a type and a length of the data stored in the blocks.

Claims

1. A memory device to store data related coupled to a replaceable printer component comprising:

a non-volatile memory unit;

an interface to provide communication between the non-volatile memory unit and a printer controller;

a plurality of data blocks in a data area of the non-volatile memory unit;

a plurality of corresponding tags in the non-volatile memory unit, a tag being associated with each data block, the tags and the data being written to the at least one block based on the determination as to whether the at least one block of the data is to be encrypted; and

a tag encryption mask stored within a header area of the non-volatile memory unit;

wherein the non-volatile memory unit is to store encrypted data and unencrypted data, and

wherein the tag encryption mask indicates an encryption status of each block of the non-volatile memory unit defined by the tags.

2. The memory device of claim 1, wherein each tag defines a length of the data stored in a corresponding data block of the plurality of data blocks and wherein a type and length of the data stored in at least two of the plurality of data blocks varies.

3. The memory device of claim 2, wherein each tag identifies a type of data stored in a corresponding one of the data blocks.

4. The memory device of claim 2, wherein each tag specifies a length of a corresponding one of the data blocks.

5. The memory device of claim 2, wherein each respective bit of the tag encryption mask corresponds to a specific tag and data block in the memory unit and indicates whether that corresponding specific data block contains data that is encrypted or unencrypted.

6. The memory device of claim 1, wherein data stored in the memory device comprises information regarding an associated replaceable printer component.

7. The memory device of claim 6, wherein the data comprises data recorded by a printing system and stored on the memory device.

8. The memory device of claim 6, wherein the data comprises operational parameters for the replaceable printer component.

9. The memory device of claim 1, wherein each tag defines a tag identity and a length of a corresponding data block, wherein the tag identity identifies a type of data stored in the corresponding data block.

10. The memory device of claim 1, wherein the tag encryption mask controls whether data being written to a particular data block by the printer controller is encrypted or unencrypted.

11. The memory device of claim 1, wherein each tag is located in the memory unit directly preceding one of the data blocks to which that tag corresponds.

12. A method of storing data on a memory device coupled to a replaceable printer component comprising:

defining at least one tag, the tags defining at least one block of the memory device;

defining data associated with each tag;

determining whether the data is to be encrypted when stored in the memory device of the replaceable printer component;

writing the tags and the data to the at least one block based on the determination as to whether the at least one block of the data is to be encrypted; and

write a tag encryption mask to a header of the memory device,

wherein the tag encryption mask indicates an encryption status of each block of the memory device defined by the tag.

13. The method of claim 12, wherein a type and a length of the data stored in at least two different data blocks associated with two different corresponding tags varies.

14. The method of claim 12, wherein the memory device comprises n number of tags to define n number of blocks of the memory device, and wherein the tag encryption mask comprises n number of bits, each of the bits indicating the encryption status of one of the n number of blocks of the memory device.

15. The method of claim 12, wherein the data defines information regarding the replaceable printer component.

16. The method of claim 12, wherein the data comprises data recorded by a printing system and stored on the memory device.

17. The method of claim 12, wherein the data comprises operational parameters for the replaceable printer component, operational parameters for a printing system to which the replaceable printer component is communicatively coupled, non-operational parameters for the replaceable printer component, non-operational parameters for the printing system, or combinations thereof.

18. A memory device to store data related to a replaceable printer component comprising:

a non-volatile memory unit;

an interface to provide communication between the non-volatile memory unit and a printer controller;

a plurality of data blocks in a data area of the non-volatile memory unit;

a plurality of corresponding tags in the non-volatile memory unit, each tag being located in the memory unit directly preceding one of the data blocks to which that tag corresponds such that a tag is associated with each data block, the tags and the data being written to the at least one block based on the determination as to whether the at least one block of the data is to be encrypted; and

a tag encryption mask stored within a header area of the non-volatile memory unit;

wherein the memory device is to store encrypted data and unencrypted data,

wherein the tag encryption mask indicates, for each tag, an encryption status of each block of the non-volatile memory unit defined by the tags, and

wherein a type or length of data stored in at least two different memory blocks varies.

19. The memory device of claim 18, wherein each respective bit of the tag encryption mask corresponds to a specific tag and data block in the memory unit and indicates, whether that corresponding specific data block contains data that is encrypted or unencrypted.