SAN JOSE -- Right on the heels of an announcement by a rival group, the SigmaRAM Consortium today unveiled its product roadmap for high-speed synchronous SRAMs that support sustained data rates of up to 24-gigabits per second at clock speeds of 333 MHz in networking and telecom systems.
The SigmaRAM Consortium said its member companies are planning to sample the first 18-megabit SigmaRAM devices in the fourth quarter of 2001. Two versions of the high-speed SRAMs will be available, with either a common I/O or separate input/output for read and write cycles.
Volume production of these 18-Mbit SRAMs are expected to begin in the first quarter of 2002, said the two-year-old consortium, which is made up of GSI Technology, Integrated Silicon Solutions Inc. (ISSI), Mitsubishi, Sony, and Toshiba.
Last week, a rival group backing the QDR (Quad Data Rate) specification also rolled out its support for 333-MHz telecom and networking systems. And like the SigmaRAM group, the QDR camp is aiming to have the first 18-Mbit prototypes of its architecture available in the fourth quarter (see June 14 story). QDR is backed by Cypress, Integrated Device Technology, Micron, NEC, and Samsung.
The SigmaRAM Consortium said its design consolidates many different SRAM architectures and operation modes into a single product family. The devices use a 209-contant ball-grid array (BGA) package that is scalable from 18-Mbit to 144-Mbit densities.
The common I/O SigmaRAM devices offer the widest data bus of 72 bits, while the separate I/O architecture has a data bus of 36 bits. The common I/O version shares one data bus with no penalties when alternating between read and write cycles, according to the group. Separate I/O versions will have independently optimized read and write cycles. Both types of I/O offer double data rate architectures, which can sustain similar throughput rates with fewer pins, said the group.
The SigmaRAM memories will operate at 333 MHz with sustained data throughput of 24 Gbit/sec. with entirely random addressing capabilties, said the consortium.