Host System That Manages a LBA Interface With Flash Memory

• US 20080155175A1
• Filed: 12/26/2006
• Published: 06/26/2008
• Est. Priority Date: 12/26/2006
• Status: Abandoned Application

• Current Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Original Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Inventors: Sinclair, Alan W., Wright, Barry
• Application Number:
  US11/616,218
• Publication Number:
  US 20080155175A1
• Time in Patent Office: Days
• US Class Current: 711/103
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 12/0646 Configuration or reconfiguration
• CPC Class Codes: G06F 2212/7206 Reconfiguration of flash memory system

Abstract

Data files are assigned addresses within one or more logical blocks of a continuous logical address space interface (LBA interface) of a usual type of flash memory system with physical memory cell blocks. This assignment may be done by the host device which typically, but not necessarily, generates the data files. The number of logical blocks containing data of any one file is controlled in a manner that reduces the amount of fragmentation of file data within the physical memory blocks, thereby to maintain good memory performance. The host may configure the logical blocks of the address space in response to learning the physical characteristics of a memory to which it is connected.

Claims

1. A data processing system, comprising:

an interface having a continuous address space,

a processor programmed to perform at least the following functions;

divide the logical address space into blocks of distinct addresses for assignment to data of file objects that are transferable through the interface, and

reassign addresses of at least some of the data of a particular file object from within a first set of at least one designated block to a different set of at least one designated block without changing said at least some of the data of the particular file object.

2. The system of claim 1, wherein the interface is additionally adapted to be connected with a re-programmable non-volatile memory system for storage therein of the data of the file objects.

3. A data processing system, comprising:

an interface having a continuous address space divided into blocks of distinct addresses for assignment to data of file objects that are transferable through the interface,

a processor programmed to perform at least the following functions;

maintain at least one list of blocks according to the character of the data of the file objects to which addresses are assigned therein,

identify one or more blocks on the list from the character of the data of at least one of the file objects to which addresses are assigned therein,

reassign addresses in a different one or more blocks to the at least one of the file objects in the identified one or more blocks, and

thereafter designate the identified one or more blocks as available to receive data of a different one of the file objects.