| 摘要 |
PURPOSE:To easily evaluate the speed of a memory by feeding back an output of the memory to an address. CONSTITUTION:The output of the memory is fed back to one address ADD through an AND gate 2. Memory contents '1' and '0' at respective addresses '0', '1' are previously written in the memory M. When a control input terminal CTRL is '0', the output of the memory M is fed back to the address ADD through an AND gate 1, the circuit forms a kind of an oscillation circuit and an oscillation waveform is obtained from the circuit. Since an oscillation cycle 1/2(td) can be evaluated as an access time of the memory, the speed of the memory can be easily evaluated by counting up the oscillation waveforms.
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