| 摘要 |
PROBLEM TO BE SOLVED: To provide a memory control method that, when reading data from a SDRAM, can prevent malfunction due to wiring delay, and can correctly fetch the data read even if the access time varies. SOLUTION: The period for reading the data from the SDRAM is detected, and the phase of a clock for the SDRAM is advanced, only during the period for reading the data, against the phase of the internal clock for operating the system so that the wiring delay of a clock line for transferring the clock for the SDRAM and a data line is cancelled out. Moreover, the information that indicates which is the SDRAM, among a plurality of SDRAMs, that has been set to be in active state for reading the data is acquired, if the SDRAM is disposed in proximity of a control device, the amount of phase lead of the clock for the SDRAM is decreased, and if disposed far away, the amount of the phase lead of the clock for the SDRAM is increased.
|
