| 摘要 |
PROBLEM TO BE SOLVED: To provide major frame synchronous detection method and system, which can detect major frame synchronism at high speed and which have less data loss during synchronism detection. SOLUTION: A minor frame synchronism part 11 takes out frame ID 21 of a minor frame and inputs it to a comparator 13. Minor frame synchronism is locked, and frame ID 21 is set in a frame ID counter 12. The frame ID counter 12 individually executes counting from then and outputs an inner ID 22. When the frame ID 21 matches with the inner ID 22, the comparator 13 outputs a major frame matching detection flag 23 to a major frame synchronism part 14. The major frame synchronism part 14 fixes major frame synchronism, when the major frame matching detection flag 23 in continuously inputted for the prescribed number of times at a minor frame switch timing. |
