| 摘要 |
PROBLEM TO BE SOLVED: To obtain a pipe counter for controlling an output path of a semiconductor memory which can input and output double data at a rising edge and a failing edge of one clock. SOLUTION: In a semiconductor memory operating synchronized by an external clock, this pipe counter comprises a pipe counter controller 202 generating a pipe counter control signal, a pipe counter activating unit 204 in which many counter activating signals are generated responding to the pipe counter control signal and only one out of the plural counter activating signals is activated. and pipe counter signal drivers 206a, 206b, 206c in which any of the plural counter activating signals is received and pipe counter signals are not activated simultaneously each other.
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