Interface for flash EEPROM memory arrays

• US 6,260,102 B1
• Filed: 12/26/1996
• Issued: 07/10/2001
• Est. Priority Date: 12/26/1996
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Robinson, Kurt B.
• Primary Examiner(s): Kim, Matthew
• Assistant Examiner(s): BATAILLE, PIERRE MICHE
• Application Number:
  US08/773,167
• Time in Patent Office: 1,657 Days
• Field of Search: 711/103, 711/111, 711/154, 711/100, 711/206, 711/209, 395/500, 365/218, 365/230.01, 365/185.33, 710/10.16, 309/327
• US Class Current: 711/103
• CPC Class Codes: G06F 13/105 where the programme performs an input/output emulation function
• CPC Class Codes: G06F 3/0607 by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
• CPC Class Codes: G06F 3/0632 by initialisation or re-initialisation of storage systems
• CPC Class Codes: G06F 3/0688 Non-volatile semiconductor memory arrays

Abstract

A device level interface for connecting a flash EEPROM memory array to other components of a computer system which interface is designed to provide signals which directly relate to the primitive operations of a flash EEPROM memory array. The interface is adapted to use a fixed command set which allows a query command to be used to determine the functionality of the array. The values returned may be used to initialize software drivers used for accessing the array in primitives which relate to the flash EEPROM memory array.

Claims

1. A method of initializing a software driver for a flash memory system comprising:

interrogating a query memory residing within the flash memory device to determine a characteristic of the flash memory device;

returning data stored in the query memory defining the characteristic of the flash memory device;

setting values for the software driver based on the characteristic provided as a result of the interrogation.

2. The method of claim 1 wherein the values for the software driver are initialization values.

3. The method of claim 1 wherein the values are determined from the data stored in the query memory.

4. The method of claim 1 wherein the values are designed to permit direct access to the flash memory device.

5. The method of claim 1 wherein interrogating the query memory further comprises sending a query command from the software driver to the query memory.

6. The method of claim 1 wherein returning data stored in the query memory further comprises returning data describing a physical parameter of the flash memory device.

7. A method of communicating with a flash memory device comprising:

interrogating a query memory residing within the flash memory device;

returning data defining a characteristic of the flash memory device stored in the query memory;

initializing a software driver based on the query response;

translating a command from a disk file system command to a command directly executable by the flash memory device;

sending the command to the flash memory device.

8. The method of claim 7 wherein returning data stored in the query memory further comprises returning data defining a physical parameter of the flash memory device technology.

9. The method of claim 7 wherein returning data stored in the query memory further comprises returning a first command set comprising a first set of basic commands used to communicate with the flash memory device.

10. The method of claim 9 wherein returning data stored in the query memory further comprises returning extensions to the first command set comprising additional commands that can be added to the first command set.

11. The method of claim 9 wherein returning data stored in the query memory further comprises returning a second command set comprising a second set of basic commands used to communicate with the flash memory device.

12. The method of claim 11 wherein returning data stored in the query memory further comprises returning extensions to the second command set comprising additional commands that can be added to the second command set.

13. The method of claim 7 wherein translating the command further comprises using a flash translation layer to translate the command into the command directly executable by the flash memory device.

14. The method of claim 7 wherein interrogating the query memory further comprises sending a query command from the software driver to the query memory.

15. A machine readable media having stored thereon a sequence of commands which when executed by a processor cause the processor to perform the following:

interrogating a query memory residing within a flash memory device to determine a characteristic of the flash memory device;

receiving data stored in the query memory defining the characteristic of the flash memory device;

setting values for a software driver based on the characteristic provided as a result of the interrogation.

16. The machine readable media of claim 18 wherein setting values further comprises setting initialization values.

17. The machine readable media of claim 15 wherein the values are determined from the data stored in the query memory.

18. The machine readable media of claim 15 wherein the values are designed to permit direct access to the flash memory device.

19. The machine readable media of claim 18 wherein interrogating the query memory further comprises sending a query command from the software driver to the query memory.

20. The machine readable media of claim 18 wherein receiving data stored in the query memory further comprises receiving data defining a physical parameter of the flash memory device.

21. A memory system comprising:

a flash memory device;

a query memory residing within the flash memory device which stores data defining a characteristic of the flash memory device;

a memory storing software, the software configured to receive data and commands in a disk file system format and convert the commands into commands directly executable by the flash memory device by providing an algorithm used for interfacing with the flash memory device based on the characteristic of the flash memory device stored in the query memory, the algorithm setting values for the software based on the characteristic of the flash memory device.

22. The memory system of claim 21 wherein the query memory stores data defining a physical parameter of the flash memory device.

23. The memory system of claim 21 wherein the query memory stores data defining a first command set comprising a first set of basic commands used to communicate with the flash memory device.

24. The memory system of claim 23 wherein the query memory stores data defining extensions to the first command set comprising additional commands that can be added to the first command set.

25. The memory system of claim 23 wherein the query memory stores data defining a second command set comprising a second set of basic commands used to communicate with the flash memory device.

26. The memory system of claim 25 wherein the query memory stores data defining extensions to the second command set comprising additional commands that can be added to the second command set.

27. The memory system of claim 21 wherein the memory is configured to permit direct access to the flash memory device.

28. The memory system of claim 21 wherein the flash memory device further comprises:

a device command interface having address decode circuitry and state machines;

a write state machine configured to assist in writing and erasing cells of blocks of flash memory;

a write buffer configured to furnish data to blocks of flash memory cells;

a status register configured to provide operational status of the flash memory device; and

a data multiplexor configured to control the transfer of data in and out of the flash memory device.