Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and apparatus for increasing the time available for refresh for 1-t SRAM compatible devices










Image Number 10 for United States Patent #6075740.

A memory system including a DRAM array, a read buffer, a write buffer and an input/output (I/O) interface. The read buffer and write buffer are coupled between the DRAM array and the I/O interface. When an external transaction involves multiple pieces of data in consecutive address locations, such as a burst access, parallel operations are performed in the DRAM array and the I/O interface. In a burst read transaction, all the data in the burst transaction is pre-fetched from the DRAM memory into the read buffer in one memory cycle. After the read data has been pre-fetched, the DRAM array is available for a refresh operation. The DRAM array can therefore be refreshed while the burst read data is sequentially transferred from the read buffer to the I/O interface. In a burst write transaction, multiple burst write data values are written to the write buffer over multiple I/O cycles. This burst write data is not retired to the DRAM array until the next write transaction. At this time, all of the burst write data is simultaneously retired to the DRAM array. As a result, the DRAM array is only engaged in the burst write transaction for one memory cycle. Because the DRAM array is not engaged in the transfer of the new data values from the I/O interface to the write buffer, the DRAM array can be refreshed during one or more of the remaining three I/O cycles.








 
 
  Recently Added Patents
Unsupervised document clustering using latent semantic density analysis
Sample analysis and/or sample processing system
Systems and methods for unchoked control of gas turbine fuel gas control valves
Method and laser receiver for acoustically indicating a laser beam
Method and apparatus for belling plastic pipe
Spatially pre-processed target-to-jammer ratio weighted filter and method thereof
Image playback device and method and electronic camera with image playback function
  Randomly Featured Patents
Protocol adapter for passing diagnostic messages between a host computer and vehicle networks operating in a J1989 or J1708 protocol
Garden scissors
Method of forming capacitors having an amorphous electrically conductive layer
Gas separation membrane and method of producing the same
Chair
Valve guard
Medallion insert for modular flooring assemblies
Programmable control or regulating device
Document processing device with merge function
Breathable, heat-sealable composite polymeric film