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Quad data rate IV SRAM supports 2,132MT/s RTR

02 Apr 2014  | Julien Happich

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Cypress Semiconductor developed its 144Mbit and 72Mbit devices, claimed to be the industry's first quad data rate IV (QDR-IV) SRAM, which support a random transaction rate (RTR) of 2,132 million transactions per second (MT/s).

The number of fully random memory accesses per second is the critical memory performance metric for increased line card and switching rates. The bottleneck for reaching increased line card rates is the processing of look-up tables, statistics and state counters stored in memory, as well as scheduling functions.

Cypress's QDR-IV SRAM is capable of operating in burst-of-two or banked burst-of-two modes, which deliver the fastest clock speeds and highest RTR of all QDR SRAMs. The banked burst-of-two operating mode operates at a maximum frequency of 1,066MHz with an RTR of 2,132MT/s, while the standard burst-of-two operating mode can achieve a maximum frequency of 667MHz and an RTR of 1,334MT/s. Both of these operating modes represent a significant improvement over the previous generation of QDR SRAM (450MHz frequency, 900MT/s RTR).

QDR-IV was developed in the QDR consortium, whose members jointly define SRAM standards to enable multiple sources and supply stability. The 144Mbit CY7C41xxKV and 72Mbit CY7C40xxKV QDR-IV SRAMs are shipping in production quantities now, available in a 361ball Flip Chip Ball Grid Array (FCBGA) package.

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