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公开(公告)号：US5201037A
公开(公告)日：1993-04-06
申请号：US430952
申请日：1989-10-31
CPC分类号： G09G5/363 , G09G5/393 , G09G2360/126
摘要： A display system uses a dual-port memory having a random access memory part and a serial access memory part as a frame buffer. Display data is transferred from the random access memory part to the serial access memory part in response to a timing signal of the data transfer. Just prior to the timing signal, an access start disable signal is generated, which has an active period being equal to or longer than an access cycle time of drawing data. When the access start disable signal is active, a draw access from a central processing unit, etc. to the dual port memory becomes disable. Further, address bits for a column of the memory are detected to become all zero and a predetermined value, so that the timing of a real time data transfer and the access start disable signal for the real time data transfer can be generated.
摘要翻译： 显示系统使用具有随机存取存储器部分和串行存取存储器部分作为帧缓冲器的双端口存储器。 响应于数据传送的定时信号，显示数据从随机存取存储器部分传送到串行存取存储器部分。 恰好在定时信号之前，生成访问开始禁止信号，其具有等于或长于绘制数据的访问周期时间的活动周期。 当访问启动禁止信号有效时，从中央处理单元等到双端口存储器的绘图访问被禁用。 此外，检测存储器的列的地址位变为全零和预定值，从而可以生成实时数据传送的定时和用于实时数据传送的访问开始禁止信号。
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公开(公告)号：US4622628A
公开(公告)日：1986-11-11
申请号：US623085
申请日：1984-06-21
CPC分类号： H02M7/53873
摘要： An inverter for converting DC power to AC power, an oscillation control circuit for stepwise generating a command value concerning the conversion condition of the inverter, and an operation controller which, when the command value from the oscillation control circuit changes, controls the oscillation control circuit to repetitively generate alternate new and old or present command values before and after change of the command value. Particularly, this invention provides an inverter capable of continuing smooth operation even when the control system has a limited resolution.
摘要翻译： 一种用于将DC电力转换为AC电力的逆变器，用于逐步产生与逆变器的转换条件相关的指令值的振荡控制电路，以及当来自振荡控制电路的指令值变化时，控制振荡控制电路 在命令值改变之前和之后重复生成备用的新旧命令值。 特别地，本发明提供了即使在控制系统具有有限分辨率的情况下也能够继续平稳运行的逆变器。
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