| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a logical circuit which can execute FA command in a relatively simple configuration. <P>SOLUTION: A delta register 4 is prepared at the output side of an accumulator 3. First, data in FA queue 1 is transmitted to FA register 2. Next, a synchronous variable (semaphore) stored in a memory 6 and a value in the FA register 2 are transmitted to the accumulator 3. This operation is conducted only at the first time. And, an output of the accumulator 3 is stored in the delta register 4. Then, the second data in the FA queue 1 is transmitted to the accumulator 3. Meanwhile, data in the delta register 4 is also transmitted to the accumulator 3. Next, an output of the accumulator 3 is stored in the delta register 4. Furthermore, the same process is conducted for the data of the third and the further in the FA queue 1. When the FA queue 1 is empty or the data in the FA queue 1 accesses a different address from what it used be, the data in the delta register 4 is written back to the memory 6 as the synchronous variable. <P>COPYRIGHT: (C)2003,JPO |
