| 摘要 |
PURPOSE: A channel selection logic circuit on a group trunk line is provided to select an optional channel from a trunk line according to channel selection information and make latch time of the data received to a BCH(Bose Chaudhuri Hocquenghem) CODEC synchronized. CONSTITUTION: A channel selection register(12) receives and stores channel information for selecting from a control device. A counter(10) counts reference clock and frame synchronous signal and then generates a BCH CODEC transmission clock and a delay clock signal. A latch clock generating unit(14) generates a clock signal for latching BCH coding data corresponding to channel selection information from a group trunk line by comparing channel selection information outputted from the channel selection register and the counter with the delay clock signal. A BCH CODEC(18) latches and stores BCH code data of the corresponding channel from the group trunk line by a latch clock outputted from the latch clock generating unit(14) and thereafter outputs BCH coding data latched by BCH CODEC transmission and reception clock outputted from the counter(10).
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