| 摘要 |
<p>PURPOSE:To shorten the access time to a memory by increasing the pulse width of a clock supplied to a processor in response to the access time required by a storage device. CONSTITUTION:A microprocessor 101 outputs an address signal 203 for execution of an access, and a D-RAM control circuit 104 detects that the signal 203 is aimed at a dynamic memory to produce the control signals 204 and 205 to the dynamic memory and also to send a dividing ratio changing signal 206 to a dividing circuit 107. The circuit 107 switches the 2-dividing ratio to the 4-dividing ratio only for a period when the signal 206 is kept at a low level. As a result, the pulse width of a dividing output waveform 202 is doubled only for the above switching period. Thus the dead time is reduced when an access is given to the memory.</p> |
