Semiconductor device with self refresh test mode

Details Semiconductor device with self refresh test mode Semiconductor device with self refresh test mode

2005-08-09

2005-08-09

Elms, Richard (Department: 2824)

Static information storage and retrieval

Read/write circuit

Data refresh

C365S201000

Reexamination Certificate

active

06928019

ABSTRACT:
A semiconductor device (such as a DRAM) includes a memory array that has dynamic memory cells. In a self refresh test mode, a self refresh test mode controller monitors and/or controls various blocks and internal signals in the semiconductor device. The self refresh test mode controller may communicate with a remote testing device through various conductors including one or more DQ lines and/or one or more address lines. The self refresh test mode controller provides at least one or more of the following four functions: (1) the ability to control internal signals while in self refresh test mode; (2) the ability to monitor internal signals while in self refresh test mode; (3) the ability to put in a programmable delay, change the delay, or change internal timing while in self refresh test mode (add delay or make delay programmable, adjustable); (4) the ability to have the device do a device read in a self refresh test mode (the DQ pins may be used to read particular data on the row, while the column address is frozen).

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