SEI specializes in high-performance memory design and offers a number of cores in the following areas:

SRAM Cores and Cache Subsystems

SEI offers a variety of SRAM cores in various configurations and technologies, including asynchronous multi-port RAM suitable for video or cache applications. Our library of SRAM sub-blocks allows us to quickly create custom SRAM cores to meet your particular requirements.

We have extensive experience in cache subsystem design for companies like Silicon Graphics, and can provide cache tag and data RAMs as well as the associated control logic as necessary.

Please contact us for specific information regarding your needs.

ROM Cores

SEI has experience with high-density ROM design and can provide you with ROM cores to meet your needs using our base library of ROM cells. For maximum speed we recommend poly-programmed ROM technology in a NOR configuration. For maximum density we recommend implant-programmed ROM in a NAND configuration.

The chip shown contains a half-megabit implant-programmed ROM on a small COT chip, together with three SRAM cores, a microprocessor, and customer-supplied logic.

High-Performance RAMDAC Cores

SEI offers a variety of high-performance dual-port palette RAMs and DACs primarily targeted at the video market. These RAMDACs and their associated analog circuitry have been used in numerous applications from stand-alone RAMDAC chips for Analog Devices to integrated RAMDACs for Chromatics mPact! chips. Operating speeds are up to 500MHz.

These cores are available for licensing in multiple configurations and depths. See the Analog Circuits page for more details on the DAC designs.

High-Speed Sense-Amp IP

High-Speed Sense-Amp IP As SRAM speeds increase to 300MHz and higher, the sense-amp must detect minute voltage swings on the memory bitlines while at the same time providing adequate noise rejection. The sense-amp gain necessary to achieve reliable readout under these conditions can result in considerable power consumption.

SEI has patented high-speed sense-amp technology that helps overcome these issues, allowing very high speed sensing to be achieved with very low power consumption. This technology has been used in numerous applications, including high-speed (500MHz) video RAMDACs and cache designs, and is available for licensing.