| 摘要 |
PURPOSE:To reduce the scale of the hardware nearly to a half and to decrease the power consumption by realizing a time slot replacement circuit using a data memory so as to apply the operation of double buffer form. CONSTITUTION:An address generated from a counter 103 and a memory 104 is inputted respectively to inputs A, B of a selection circuit 102, which switches the address and gives the result to a data memory 101. A selection pulse 107 is inputted to an input B of the selection circuit 102 as a 1-bit address data and a selection pulse 108 being the inverted pulse 107 is inputted to the input A. Either one of the 1-bit address data is selected by the selection circuit 102 and the resulting address data 110 is given to the data memory 101. The area A of the data memory 101 is selected when the address data 110 is logical '0' and the area B is selected conversely when logical '1'. A latch circuit 105 latches a readout data from the data memory 101 and outputs it. |
