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The synchronization protection count can be set separately for both forward and back protection. The count conditions for the protection counts are as follows. Back protection mode (not synchronized: BLOCK = low) If the timing of the IC internal synchronization free-running counter matches the timing of the received BIC, the protection count is incremented by l. Contrarily, if the timings of the IC internal counter and the received BIC do not match, the protection counter is cleared t0 0. The timing of the count is the timing ofthe IC internal counter. Forward protection mode (synchronized: BLOCK = high) In reverse to the back protection mode, if the timing of the IC internal free-running counter does not match the detection timing of the received BIC, the protection counter is incremented, and if the timings match, the protection counter is cleared t0 0. Figure l shows the states ofthe protection counter for the cases where the forward and back protection counts are both 3. This lC defines the value ofthe protection counter to be l at the point that a match or a discrepancy occures between the IC internal timing and the timing of the received BIC. For example, when the value ofthe back protection count is 2, the IC internal timing and the timing ofthe received BIC will have matched two times consecutively. If the protection data is set to new values, for example if the protection counts are set t0 3 as assumed in figure l, applications must send values which are l less than the intended value; in this case 22H. Similarly, if the value is set to OOH, the protection counts will, by definition, be set t0 1 for both the forward and back directions. However, note that the resulting operation will be equivalent to there being no protection circuit. The default values are 8 for the forward protection count and 2 for the back protection count. If the block synchronization output (BLOCK) is used for discriminating whether or not FM multiplex data is present, we recommend setting the block synchronization back protection count to a value that is more strict than the default value. (That is, we recommend replacing the default value of 2 with a value of 3 0r higher.)