| 摘要 |
PULSE INSERTION CIRCUIT The pulse insertion circuit comprises a series to parallel converter converting a series of input data to two parallel input data having a half clock frequency by distributing the series data alternately, a parallel type elastic memory writing or reading the two parallel input data synchronously, a delay circuit delaying one of the two parallel input data, a selector selecting two data for two outputs from the two parallel input data and the delayed data, a control circuit stopping a read clock signal of the elastic memory for one clock period, and a pulse addition circuit adding a pulse to the parallel data upon receipt of a pulse insertion request signal when the delayed data is selected or the read clock signal is stopped. By using this pulse insertion circuit, a pulse insertion necessary for multiplexing can be carried out with a circuitry adapted to operate at a half of a frequency of the series input data. |
