SEMICONDUCTOR DEVICE

PROBLEM TO BE SOLVED: To easily changeover the refresh period during a refresh time of memory which requires refresh from the external side by providing a logic circuit to supply a period setting signal for designating one of a plurality of refresh periods and a clock to the memory. SOLUTION: CPU1 s...

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Bibliographic Details
Main Authors OTA KIYOTO, FUJIMOTO TOMONORI
Format Patent
LanguageEnglish
Published 08.10.1999
Edition6
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
INFORMATION STORAGE
PHYSICS
STATIC STORES
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Summary:PROBLEM TO BE SOLVED: To easily changeover the refresh period during a refresh time of memory which requires refresh from the external side by providing a logic circuit to supply a period setting signal for designating one of a plurality of refresh periods and a clock to the memory. SOLUTION: CPU1 supplies, depending on an external low power mode instruction LPM, a clock CP, an auto-refresh period setting signal RAUTO, a self-refresh control signal RSELF and a refresh period setting signal SLFPS to control DRAM core 2. Namely, CPU1 changes over the refresh period by the refresh period setting signal SLFPS during the self-refresh of DRAM core 2 to set the DRAM core 2 to the self-refresh mode and elongates the refresh period of the DRAM core 2 in the timing wherein internal temperature of the semiconductor device is sufficiently lowered.
Bibliography:Application Number: JP19980073627