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- Quad_Data_Rate_SRAM abstract "Quad Data Rate (QDR) SRAM is a type of static RAM computer memory that can transfer up to four words of data in each clock cycle. Like Double Data-Rate (DDR) SDRAM, QDR SRAM transfers data on both rising and falling edges of the clock signal. The main purpose of this capability is to enable reads and writes to occur at high clock frequencies without the loss of bandwidth due to bus-turnaround cycles incurred in DDR SRAM. QDR SRAM uses two clocks, one for read data and one for write data and has separate read and write data buses (also known as Separate I/O), whereas DDR SRAM uses a single clock and has a single common data bus used for both reads and writes (also known as Common I/O). This helps to eliminate problems caused by the propagation delay of the clock wiring, and allows the illusion of concurrent reads and writes (as seen on the bus, although internally the memory still has a conventional single port - operations are pipelined but sequential). When all data I/O signals are accounted, QDR SRAM is not 2x faster than DDR SRAM but is 100% efficient when reads and writes are interleaved. In contrast, DDR SRAM is most efficient when only one request type is continually repeated, e.g. only read cycles. When write cycles are interleaved with read cycles, one or more cycles are lost for bus turnaround to avoid data contention, hence bus efficiency is reduced. Most SRAM manufacturers constructed QDR and DDR SRAM using the same physical silicon, differentiated by a post-manufacturing selection (e.g. blowing a fuse on chip).QDR SRAM was designed for high-speed communications and networking applications, where data throughput is more important than cost, power efficiency or density. The technology was created by Micron and Cypress, later followed by IDT, then NEC, Samsung and Renesas. Quad Data Rate II+ Memory is currently being designed by Cypress Semiconductor for Radiation Hardened Environments. The device has Total Dose rating of 300Krad, No Latchup at 120 LET and SEU data of 1.34E-10, by using simple SECDED Hamming code.".
- Quad_Data_Rate_SRAM wikiPageExternalLink www.qdrconsortium.org.
- Quad_Data_Rate_SRAM wikiPageExternalLink an4065_12.pdf.
- Quad_Data_Rate_SRAM wikiPageID "1001218".
- Quad_Data_Rate_SRAM wikiPageLength "3427".
- Quad_Data_Rate_SRAM wikiPageOutDegree "14".
- Quad_Data_Rate_SRAM wikiPageRevisionID "642320749".
- Quad_Data_Rate_SRAM wikiPageWikiLink Category:Computer_memory.
- Quad_Data_Rate_SRAM wikiPageWikiLink Clock_signal.
- Quad_Data_Rate_SRAM wikiPageWikiLink Computer_memory.
- Quad_Data_Rate_SRAM wikiPageWikiLink Computer_network.
- Quad_Data_Rate_SRAM wikiPageWikiLink Cypress_Semiconductor.
- Quad_Data_Rate_SRAM wikiPageWikiLink DDR_SDRAM.
- Quad_Data_Rate_SRAM wikiPageWikiLink Data.
- Quad_Data_Rate_SRAM wikiPageWikiLink Integrated_Device_Technology.
- Quad_Data_Rate_SRAM wikiPageWikiLink Micron_Technology.
- Quad_Data_Rate_SRAM wikiPageWikiLink NEC.
- Quad_Data_Rate_SRAM wikiPageWikiLink Renesas_Electronics.
- Quad_Data_Rate_SRAM wikiPageWikiLink Samsung.
- Quad_Data_Rate_SRAM wikiPageWikiLink Static_random-access_memory.
- Quad_Data_Rate_SRAM wikiPageWikiLink Telecommunication.
- Quad_Data_Rate_SRAM wikiPageWikiLinkText "QDR".
- Quad_Data_Rate_SRAM wikiPageWikiLinkText "Quad Data Rate SRAM".
- Quad_Data_Rate_SRAM subject Category:Computer_memory.
- Quad_Data_Rate_SRAM hypernym Memory.
- Quad_Data_Rate_SRAM type Company.
- Quad_Data_Rate_SRAM type Array.
- Quad_Data_Rate_SRAM type Datum.
- Quad_Data_Rate_SRAM comment "Quad Data Rate (QDR) SRAM is a type of static RAM computer memory that can transfer up to four words of data in each clock cycle. Like Double Data-Rate (DDR) SDRAM, QDR SRAM transfers data on both rising and falling edges of the clock signal. The main purpose of this capability is to enable reads and writes to occur at high clock frequencies without the loss of bandwidth due to bus-turnaround cycles incurred in DDR SRAM.".
- Quad_Data_Rate_SRAM label "Quad Data Rate SRAM".
- Quad_Data_Rate_SRAM sameAs Q7268276.
- Quad_Data_Rate_SRAM sameAs QDR_SDRAM.
- Quad_Data_Rate_SRAM sameAs m.03y5yg.
- Quad_Data_Rate_SRAM sameAs Q7268276.
- Quad_Data_Rate_SRAM wasDerivedFrom Quad_Data_Rate_SRAM?oldid=642320749.
- Quad_Data_Rate_SRAM homepage www.qdrconsortium.org.
- Quad_Data_Rate_SRAM isPrimaryTopicOf Quad_Data_Rate_SRAM.