公开(公告)号：US5767862A

公开(公告)日：1998-06-16

申请号：US616546

申请日：1996-03-15

申请人： Subramanian Krishnamurthy ,  James Peterson ,  Paul Shupak

发明人： Subramanian Krishnamurthy ,  James Peterson ,  Paul Shupak

IPC分类号： G09G5/00 ,  G09G5/395

CPC分类号： G09G5/395

摘要： A method and an apparatus for writing display data to and reading display data from a FIFO. In one embodiment of the present invention, a memory controller coupled to a memory is configured to retrieve display data from the memory and write the retrieved data to a FIFO. The memory controller retrieves the display data from the memory in response to a FIFO write signal received from an output display controller. The output display controller is further configured to generate a FIFO read signal which is received by the FIFO. In response to the FIFO read signal, display data entries are sequentially read from the FIFO and transferred to an output display. The present invention features a programmable memory circuit such as a register, configured to store the value pointing to a particular display data entry in the FIFO. When the particular display data entry is read, a subsequent FIFO write signal is issued to the memory controller. The value stored in the programmable memory circuit is chosen to minimize the occurrences of overflow and underflow conditions in the FIFO. In addition, the present invention features a self-adjusting, or self-throttling aspect which provides the present invention with the capability to dynamically adapt to different computer system configurations having different system clock and video clock frequencies.

摘要翻译： 一种用于向FIFO写入显示数据并从其读取显示数据的方法和装置。 在本发明的一个实施例中，耦合到存储器的存储器控​​制器被配置为从存储器检索显示数据并将检索的数据写入FIFO。 存储器控制器响应于从输出显示控制器接收到的FIFO写信号，从存储器检索显示数据。 输出显示控制器还被配置为产生由FIFO接收的FIFO读信号。 响应于FIFO读信号，显示数据条目从FIFO顺序读取并传送到输出显示。 本发明具有诸如寄存器的可编程存储器电路，其被配置为存储指向FIFO中的特定显示数据条目的值。 当读取特定显示数据条目时，向存储器控制器发出随后的FIFO写入信号。 存储在可编程存储器电路中的值被选择以最小化FIFO中溢出和下溢条件的发生。 此外，本发明具有自调节或自节流方面，其提供本发明动态适应具有不同系统时钟和视频时钟频率的不同计算机系统配置的能力。