公开(公告)号：US06988207B2

公开(公告)日：2006-01-17

申请号：US09882960

申请日：2001-06-15

申请人： Yiu Lam Chan ,  Michael R. Sollins ,  Ronald R. Munoz

发明人： Yiu Lam Chan ,  Michael R. Sollins ,  Ronald R. Munoz

IPC分类号： G06F9/00 ,  G06F3/00 ,  H04B3/46

CPC分类号： G01R31/318552 ,  G01R31/318572 ,  G01R31/318594

摘要： A circuit that uses a bi-directional buffer as follows: First a tri-state output buffer is connected to a functional clock and a bi-directional port is connected to a test clock. The bi-directional buffer is configured to receive control signals to selectively block and unblock the tri-state output port connected to the functional clock. In addition, the bi-directional port connected to a test clock is connected to the internal logic of the device. When the tri-state output buffer connected to the functional clock is blocked, the test clock transmits a clock signal to the internal logic of the device. When the tri-state output buffer connected to the functional clock is unblocked, the functional clock transmits a clock signal to the internal logic of the device.

公开(公告)号：US06954531B2

公开(公告)日：2005-10-11

申请号：US09882951

申请日：2001-06-15

申请人： Michael R. Sollins

发明人： Michael R. Sollins

IPC分类号： H04M19/04 ,  H04M3/00

CPC分类号： H04M19/04

摘要： A ring voltage generator uses values stored in random access memory to generate a train of pulses used to drive a voltage waveform to ring a telephone ringer. The values are stored in RAM, and are programmable by a user without requiring a change in the ring voltage generator design.

摘要翻译： 环形电压发生器使用存储在随机存取存储器中的值来产生用于驱动电压波形振铃电话铃声的一串脉冲。 这些值存储在RAM中，并且可以由用户编程，而不需要改变环形电压发生器设计。