公开(公告)号：JP2000231534A

公开(公告)日：2000-08-22

申请号：JP2000012794

申请日：2000-01-21

Applicant: IBM

Inventor： DELL TIMOTHY J ,  STEVEN A GRANDON ,  MARK W KELLOGG

IPC: G06F3/00 ,  G06F12/00 ,  G06F13/16 ,  G06F13/42 ,  G11C5/00 ,  G11C7/00 ,  G11C11/401

Abstract: PROBLEM TO BE SOLVED: To obtain a single memory system which can be applied to either a 3.3V DIM or a DDR DIMM by allowing a data storage device to selectively apply each termination to each data inquiry line as necessary. SOLUTION: A DIM identifying circuit means 77 is provided in a memory controller 16b for identifying the kind of a DIMM inserted into a memory 10, and for transmitting a switch activation pulse through a strobe line 78 to termination boards 67 and 68 when it is judged that a DDR DIMM is inserted into the memory 10. The DIMM is provided with an identifying means such as a PROM circuit to be integrated into each DIMM at the time of manufacturing regardless of the kind of the DIMM, that is, 3.3V DIMM or DDR DIMM. Therefore, the kind of the DIMM inserted into the memory 10, that is, 3.3V DIMM or DDR DIMM can be identified by the DIMM identifying circuit means 77.