Electronic device to which memory module can be added

• US 20060242344A1
• Filed: 03/10/2006
• Published: 10/26/2006
• Est. Priority Date: 04/11/2005
• Status: Abandoned Application

• Current Assignee: Murata Machinery Limited (Muratec)
• Original Assignee: Murata Machinery Limited (Muratec)
• Inventors: Daikoku, Katsutoshi
• Application Number:
  US11/373,586
• Publication Number:
  US 20060242344A1
• Time in Patent Office: Days
• US Class Current: 710/301
• CPC Class Codes: G06F 13/4081 Live connection to bus, e.g. hot-plugging current or voltage limitation during live insertion H02H9/004

Abstract

An electronic device includes a board on which a memory module can be added. An expansion memory and a battery, which supplies power to the expansion memory, are arranged on the memory module.

Claims

1. An electronic device including a board on which a memory module can be added, the electronic device comprising:

an expansion memory which is arranged on the memory module; and

a battery which is arranged on the memory module and supplies power to the expansion memory.

2. The electronic device according to claim 1, further comprising a charge control circuit which is arranged on the memory module and charges the battery.

3. The electronic device according to claim 2, further comprising a switch which breaks a connection between the battery and a power source line of the board when the power is being supplied from the battery to the expansion memory.

4. The electronic device according to claim 2, further comprising a diode which breaks a connection between the battery and a power source line of the board when the power is being supplied from the battery to the expansion memory.

5. The electronic device according to claim 1, wherein the expansion memory is a Synchronous Dynamic Random Access Memory (SDRAM).

6. The electronic device according to claim 1, further comprising a slot arranged on the board to insert the memory module.

7. An electronic device including a board on which a memory module can be added, the electronic device comprising:

a main memory which is arranged on the board;

a first battery which is arranged on the board and supplies power to the main memory;

a memory module which is added to the board; and

a second battery which is arranged on the memory module and supplies power to a memory on the memory module.

8. The electronic device according to claim 7, further comprising a charge control circuit which is arranged on the memory module and charges the second battery.

9. The electronic device according to claim 8, further comprising a switch which breaks a connection between the second battery and a power source line of the board when the power is being supplied from the second battery to the memory.

10. The electronic device according to claim 8, further comprising a diode which breaks a connection between the second battery and a power source line of the board when the power is being supplied from the second battery to the memory.

11. The electronic device according to claim 7, wherein the memory on the memory module is a Synchronous Dynamic Random Access Memory (SDRAM).

12. The electronic device according to claim 7, further comprising a slot arranged on the board to insert the memory module.