Non-volatile memory data integrity validation

• US 8,128,186 B2
• Filed: 07/27/2007
• Issued: 03/06/2012
• Est. Priority Date: 07/27/2007
• Status: Active Grant

• Current Assignee: Hewlett-Packard Company (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Bauman, Joseph H.
• Primary Examiner(s): Le, Uyen Chau N
• Assistant Examiner(s): Prince, Kajli
• Application Number:
  US11/881,543
• Publication Number:
  US 20090027439A1
• Time in Patent Office: 1,684 Days
• Field of Search: 347/19
• US Class Current: 347/19
• CPC Class Codes: B41J 2/17546 electronically
• 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

Abstract

The present disclosure relates to a replaceable printing component for use in a printing system including print mechanism configured to receive the replaceable printing component. The replaceable printing component includes an electrical storage device responsive to printing system control signals for selectively storing information received from the print mechanism, the electrical storage device includes a storage portion containing data associated with the replaceable printing component, and first and second validation fields configured to store error detection codes relatable to the data contained in the storage portion to determine whether the data is valid. Wherein the electrical storage device is configured, prior to a first transfer of data from the print mechanism to the storage portion, to receive and store in one of the first and second validation fields an error detection code related to the data currently contained in the storage portion, and the electrical storage device is configured to receive and store in the other of the first and second validation fields an error detection code related to the data that will be contained in the storage portion after the first data transfer.

Claims

1. A printing system for selectively depositing visible material on print media, the printing system comprising:

a print mechanism configured to receive a replaceable printing component, the print mechanism including a control portion for transferring data between the print mechanism and the replaceable printing component; and

a replaceable printing component including an electrical storage device responsive to printing system control signals for selectively storing information received from the print mechanism, the electrical storage device including;

a storage portion containing data associated with the replaceable printing component; and

first and second validation fields configured to store error detection codes relatable to the data contained in the storage portion to determine whether the data is valid;

wherein the electrical storage device is configured, prior to a first transfer of data from the print mechanism to the storage portion, to receive and store in one of the first and second validation fields a first error detection code related to the data currently contained in the storage portion, and the electrical storage device is configured to receive and store in the other of the first and second validation fields a second error detection code related to the data that will be contained in the storage portion after the first data transfer; and

wherein the control portion is configured to transfer, to the first validation field, the second error detection code related to the data that will be contained in the storage portion after the first data transfer and to transfer, to the second validation field, a third error detection code related to the data that will be contained in the storage portion after a second data transfer successively following the first data transfer.

2. The printing system for selectively depositing visible material on print media of claim 1, wherein prior to a subsequent transfer of data from the print mechanism to the storage portion, the electrical storage device is configured to receive and store, in the one of the first and second validation fields not containing data related to the data contained in the storage portion immediately prior to the subsequent transfer of data, an error detection code related to the data that will be contained in the storage portion after the subsequent transfer.

3. The printing system for selectively depositing visible material on print media of claim 2 wherein the storage portion comprises a plurality of parameter fields associated with the replaceable printing component, and each parameter field of the plurality of parameter fields comprises a plurality of parameter values, the plurality of parameter fields sized in the storage portion in blocks of the parameter values having a preselected size such that a transfer of a single block to one of the parameter fields may be made atomically in a single write operation.

4. The printing system for selectively depositing visible material on print media of claim 1, wherein the control portion is configured to compute parity data, comprising the second error detection code, from the data that will be contained in the storage portion after the first transfer.

5. The printing system for selectively depositing visible material on print media of claim 1, wherein the control portion is configured to compute a cyclic redundancy check, comprising the second error detection code, from the data that will be contained in the storage portion after the first transfer.

6. The printing system for selectively depositing visible material on print media of claim 1, wherein the control portion is configured to compute a hash sum, comprising the second error detection code, from the data that will be contained in the storage portion after the first transfer.

7. The printing system for selectively depositing visible material on print media of claim 1 wherein the print mechanism is an ink-jet printing system, the visible material is ink, and the replaceable printing component further includes a replaceable ink container containing a quantity of ink, the replaceable ink container providing ink to the print mechanism.