MEMORY MODULE HAVING ADDRESS MIRRORING FUNCTION

摘要

A memory module having an address minoring function is provided. The memory module includes a register that allows mode registers of first memory chips of a first rank and mode registers of second memory chips of a second rank to be identically programmed in response to a mode register set (MRS) command during a rank-merged test mode. The register sets address signals, which are symmetrically connected to the first and second memory chips through through-via-holes (TVHs) or blind-via-holes (BVHs) of a printed circuit board, to be selectively mirrored.

主权项

1. A memory module comprising:
first memory chips of a first rank, mounted on a first surface of a printed circuit board; second memory chips of a second rank, mounted on a second surface of the printed circuit board that is opposite to the first surface of the printed circuit board; and a register configured to identically program mode registers of the first memory chips of the first rank and mode registers of the second memory chips of the second rank according to address signals received together with a first mode register set (MRS) command, in response to the first MRS command during testing of the memory module.