| 摘要 |
PROBLEM TO BE SOLVED: To provide a bidirectional repeater circuit capable of preventing a pre-frame from becoming short at the time of relaying in SDLC communication. SOLUTION: Data inputted from a differential transmission line 100 through a line receiver 10 to a shift register 30 are delayed for 7 cycles of CP and sent out from a line driver 20 to the differential transmission line 100. The line driver 20 is enabled with the input of "HHHH" to the shift register 30 as a trigger and a counter 40 starts counting from there. At the time of counting to a full count value, the counter 40 disables the line driver 20 but an initial value is set to keep an enable state while the data are inputted to the circuit. The same circuit is provided for both transmission directions, and while data are inputted to one of them, the line driver 20 of the other is disabled. COPYRIGHT: (C)2004,JPO&NCIPI
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