Circuit and method for preserving data in sleep mode of...

Details Circuit and method for preserving data in sleep mode of... Circuit and method for preserving data in sleep mode of...

2005-02-18

2008-05-20

Dinh, Son (Department: 2824)

Static information storage and retrieval

Powering

Data preservation

C365S229000, C365S233100

Reexamination Certificate

active

07376039

ABSTRACT:
A data storage circuit and a data preservation method for preserving data when a semiconductor device is in a sleep mode using a test scan chain are provided, where the data storage circuit includes a sleep mode control unit and a scan chain unit, the sleep mode control unit outputs a scan control signal and a scan clock signal in response to one of a test control signal and a sleep mode control signal received from the outside, stores an output data signal in a memory when the output data signal is received, and outputs a test pattern data signal as a scan data signal when the test pattern data signal is received, the scan chain unit outputs a normal data signal stored inside of the scan chain unit as the output data signal to the sleep mode control unit or receives and outputs the scan data signal to a combinational circuit unit in response to the scan control signal and the scan clock signal, and the data storage circuit and the data preservation method prevent a loss of data in a sleep mode of a semiconductor device, and reduce power consumption in a standby state.

REFERENCES:
patent: 6256252 (2001-07-01), Arimoto
patent: 6310491 (2001-10-01), Ogawa
patent: 6433586 (2002-08-01), Ooishi
patent: 7058834 (2006-06-01), Woods et al.
patent: 7269780 (2007-09-01), Arima et al.

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