| 摘要 |
PURPOSE:To suppress generation of an overrun by giving necessary information instead of address information sent from a memory request origin at the time of a memory access. CONSTITUTION:When a memory request 11 is received by a request receiving circuit 2, address information is sent from an information line 10. Since a bit 13 is ''0'', an AND gate 4 is opened and a memory access discriminating circuit 6 is operated. By its control, an address of an address register 3 is given to a memory body 21. Also, when read-out is designated, a data of the address of the address register 3 is read out of the memory body 21, and sent out to the information line 10 from a driver 18 through an AND gate 19. Also, in case of write, a write data is stored in advance in a register through the signal line 10 from the request origin, and it is written in a position shown by the address of the address register 3. |
