Spacing periodic commands to a volatile memory for increased performance and decreased collision
US8549217B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2009 |
| Grant date | Oct 1, 2013 |
| Priority date | — |
| Expiry date | Jul 23, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C11/40611
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A periodic command spacing mechanism is provided for spacing periodic commands (e.g., refresh commands, ZQ calibration, etc.) to a volatile memory (e.g., SDRAM, DRAM, EDRAM, etc.) for increased performance and decreased collision. In one embodiment, periodic command requests are monitored and if a collision is detected between two or more of the requests, the colliding requests are spaced with respect to one another by a timer offset applied on a chip select basis. The periodic command spacing mechanism may be used in conjunction with command arbitration to make sure the periodic commands are executed without significantly impacting performance (e.g., Reads and Writes are allowed to flow). Preferably, the periodic command requests are initialized by generating an initial sequence of individual requests, each successive request in the initial sequence being generated spaced apart with respect to the previous request by a timer offset applied on a chip select basis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.