| 摘要 |
PURPOSE:To simplify circuit constitution by reducing the number of pre-trigger counters, by constituting a pre-trigger circuit using an address generator for making a trigger enable signal active and a presettable counter. CONSTITUTION:An address generator AG has function capable of setting a start address ast, and the sample timing signal clk from a timing control circuit TMC and the stop signal stp obtained from a presettable counter PC2 are applied to said address generator AG and address output is applied to the address terminal ADR of a memory RAM. The address generator AG makes a trigger enable signal ten active when an address value becomes max. and returns to zero and said signal ten is applied to a trigger control circuit TC. By this mechanism, a waveform memory apparatus wherein the constitution of a pre-trigger circuit is simplified can be obtained.
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