Dynamic command and/or address mirroring system and method for memory modules

• US 20070143553A1
• Filed: 02/13/2007
• Published: 06/21/2007
• Est. Priority Date: 02/05/2004
• Status: Active Grant

• Current Assignee: Round Rock Research LLC
• Original Assignee: Micron Technology, Inc.
• Inventors: LaBerge, Paul
• Granted Patent: US 7,546,435 B2
• Time in Patent Office: Days
• US Class Current: 711/154
• CPC Class Codes: G06F 12/0653 with centralised address assignment
• CPC Class Codes: G11C 5/00 Details of stores covered by group G11C11/00

Abstract

A memory module includes a memory hub that couples signals to memory devices mounted on opposite first and second surfaces of a memory module substrate. The memory devices are mounted in mirrored configuration with mirrored terminals of memory devices on opposite surfaces being interconnected. A memory hub mounted on each module alters the configuration of address and/or command signals coupled to the memory devices depending upon whether the memory devices on the first surface of the substrate or the memory devices on the second surface of the substrate are being accessed. Alternatively, the configuration of the address and/or command signals coupled to mirrored memory devices may be altered by a register mounted on the substrate that is coupled to the memory devices or by a memory controller coupled directly to memory devices on one or more memory modules.

Claims

1. A method of accessing a plurality of memory devices in which a plurality of terminals of a first of the memory devices are interconnected with a corresponding plurality of terminals of a second of the memory devices in a manner that causes the first and second memory devices to function differently responsive to respective address or control signals applied to the interconnected terminals, the method comprising:

if the first memory device is being accessed, applying control or address signals to the interconnected terminals according to a first set of terminal assignments; and

if the second memory device is being accessed, applying control or address signals to the interconnected terminals according to a second set of terminal assignments that is at least in part different from the first set of terminal assignments.

2-40. -40. (canceled)