The latest Quartus II software v14.1 from Altera supports designs with Cypress’s QDR-IV SRAMs and Altera’s Arria 10 FPGAs. The release supports simulation, compilation and timing for designs with Cypress’s QDR-IV SRAMs, which form part of the highest performance, standardised networking memory solution. The software support enables customers to design in a QDR-IV SRAM at its fastest clock speeds and achieve the high Random Transaction Rate (RTR) required to achieve 100-400 Gigabit line card rates.
RTR, 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. QDR-IV devices deliver the RTR required to support these functions, enabling higher bandwidth and higher quality video streams. Cypress’s QDR-IV SRAM is capable of operating in burst-of-two (High Performance) or banked burst-of-two (Xtreme Performance) modes, delivering the fastest clock speeds and highest RTR of all QDR SRAMs. Using Quartus II v14.1, the banked burst-of-two mode can be operated at a maximum frequency of 1,066 MHz with an RTR of 2,132 million transactions per second (MT/sec), while the standard burst-of-two mode can be operated at a maximum frequency of 667 MHz and an RTR of 1,334 MT/sec.
Cypress offers QDR-IV SRAMs in 144- and 72-Mb densities. The 144-Mb CY7C41xxKV and 72-Mb CY7C40xxKV QDR-IV SRAMs are shipping in production quantities today and are available in a 361-ball Flip Chip Ball Grid Array (FCBGA) package.
QDR-IV was developed in the QDR consortium , whose members jointly define SRAM standards to enable multiple sources and supply stability.