| 摘要 |
PURPOSE:To ensure an economical and quick initial setting by adding the read/ write switching circuit, the writing pulse formation circuit and others to the holding memory and time switch on the time-division channel. CONSTITUTION:In the initial setting due to the make of the power source, read/ write switching circuit RWSEL selects the writing pulse in reading cycle R based on control information cont and then applies it to memory M. And the initial set pattern is used for the data which is applied to memory M from control part CONT. Thus for the memory address, output f of counter CNT is used, and also writing pulse g is applied to memory M even in reading cycle R. As a result, the initial set patterns are written in sequence into all addresses of memory M. Supposing one frame is about 125mus, the initial set patterns have been written into all addresses of M after about 125 s, thus completing the initial setting for memory HM. The same action is given also to the time switch for the initial setting. |
