| 摘要 |
PROBLEM TO BE SOLVED: To improve access efficiency by making data from bas masters writable in a memory in a page mode by providing a memory access sequencer having a specified function. SOLUTION: A memory access sequencer 5 has a function which compares addresses (c) to (f) from bus masters 2 and 3 and write data holding parts 10 and 11 with an address (g) at the time of the preceding memory access and preferentially selects a writeback request on the same page. The sequencer 5 selects the request of an address to be a page mode among the low addresses (c) and (d) of writeback requests (h) and (j) from the bas masters 2 and 3 and the row addresses (e) and (f) of the write data holding parts 10 and 11 and performs memory write to a memory element part 14. At the same time, it updates the low address (g) at the time of memory access held by an address latch 12. A flag 22 showing the existence of the address of the row address (g) is set in the address latch 12.
|
