| 摘要 |
PURPOSE:To keep a sequential characteristic and to execute a parallel processing by being equipped with a port for a grouped bank and providing a register to hold an address corresponding to respective ports and a checking circuit to investigate a bank using condition. CONSTITUTION:An address register 1 sends out a part of an address to a control circuit 2 by a line 101 and sends out a remaining address to address holding registers 3-0-3-3 by a line 102. The registers 3-0-3-3 send out an address held at memory modules 6-0-6-3 by lines 301-304 and send out a part of the address to bank checking circuits 5-0-5-3. Circuits 5-0-5-3 investigate the using condition of a bank which the address set to the registers 3-0-3-3 accesses, when the bank is not used, a request signal to the memory is sent out and the circuits have the function to register the bank which comes to be newly the using condition.
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