| 摘要 |
<p>PURPOSE:To reduce the time and trouble required for the initialization of a write and read memory as much as possible by initializing the memory according to an initialization pattern when a detecting means begins to supply a power or clock signal. CONSTITUTION:When a power source detecting circuit PD or clock detecting circuit CD detects the start of supply of a power or clock signal, an FF is set and a counting circuit CNT is started with its output to begin to step with an external clock and sends its count output (n) to a pattern generating circuit PG and a selecting circuit SEL1. The circuit PG transmits an initialization pattern ip to a selecting circuit SEL2 synchronously with the output (n). Consequently, the output (n) and pattern ip are inputted to the address terminal A and data terminal D of the memory MEM. Consequently, the pattern ip is stored successively from the starting address of the memory MEM according to the stepping of the output (n) and the entire storage area of the memory MEM is initialized with the pattern ip.</p> |
