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US 2002/0120820 A1Published application
Memory device for controlling nonvolatile and volatile memories
AssigneeFujitsu Limited
InventorsYoshinobu Higuchi, Shinji Mizutani, Keisuke Kanazawa
Life of this patent
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Abstract
A memory device includes a nonvolatile memory capable of storing data, a volatile memory capable of being random-accessed, and a controller for transferring data between the nonvolatile memory and the volatile memory and enabling a pseudo access as if the volatile memory were externally directly accessed in accordance with an instruction through an external bus when the data transfer is not performed.
Claims38
A memory device comprising:
- a nonvolatile memory capable of storing data;
- a volatile memory capable of being random-accessed;
- and
- a controller for transferring data between said nonvolatile memory and said volatile memory and enabling a pseudo access as if said volatile memory were externally directly accessed in accordance with an instruction through an external bus when the data transfer is not performed.
1 more element
A memory device comprising:
- a nonvolatile memory capable of storing data;
- a volatile memory capable of being random-accessed;
- and
- a controller capable of starting writing a plurality of data units in said volatile memory or said nonvolatile memory before said plurality of data units have been completely read out from said nonvolatile memory or said volatile memory in data transfer between said nonvolatile memory and said volatile memory.
1 more element
A memory device comprising:
- a plurality of memories having different electrical specifications;
- and
- a controller including a memory bus connected to said plurality of memories and an external bus externally connected, said external bus having a single input/output voltage level, said memory bus and said external bus having different input/output voltage level ranges.
A memory device comprising:
- a nonvolatile memory including an actual data area for storing a plurality of actual data units and a spare data area for storing a plurality of spare data units;
- a volatile memory including an actual data area for storing a plurality of actual data units and a spare data area for storing a plurality of spare data units;
- and
- a controller for performing data transfer between said nonvolatile memory and said volatile memory.
1 more element
Dependencies are inferred from the claim text.