| 摘要 |
<p>PURPOSE:To continuously read the contents of a read-only memory at a high speed by providing the read-only memory, operation-period indication signal generating circuit, read-request signal generating circuit, and switching circuit. CONSTITUTION:Switching circuit 5 outputs operation-period indication signal BY inputted to input terminal A when control signal MD is at ''1'' or read indication signal RO inputted to input terminal B when at ''0''. Operation-period indication signal generating circuit 6 outputs from output terminal OS operation-period indication signal BY which when operation-start indication signal ST is inputted to input terminal IS, is held at ''1'' during the operation period. Namely, if operation-start indication signal ST is inputted to operation-period indication signal generating circuit 6 when control signal MD is at ''1'', operation-start indication signal ST serves as a trigger signal, so that read-request signal generating circuit 4 will output continuously read request signal CK to output terminal TG. Thus, the contents of read-only memory 1 can be read continuously at a high speed.</p> |
