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IDT71F432 Datasheet(PDF) 1 Page - Integrated Device Technology |
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IDT71F432 Datasheet(HTML) 1 Page - Integrated Device Technology |
1 / 5 page Integrated Device Technology, Inc. COMMERCIAL TEMPERATURE RANGE DECEMBER 1996 ©1996 Integrated Device Technology, Inc. DSC-3555/3 13.1 1 fundamentally compatible with standard PBSRAM, with addi- tional features to accommodate the internal DRAM operation of the memory. These additional features are defined so that 71F432 compatible system controllers and properly imple- mented PC boards can work transparently with either the 71F432 or PBSRAM in cache memory applications. Six pins, identified as No Connect (NC) on the standard PBSRAM specifications, are used to support 71F432 opera- tion. These pins are 5V supply (2), host bus W/R#, RESET# and two proprietary functions labeled F0 and F1. When using standard PBSRAM, these pins have no effect and the associ- ated functions in the 71F432-compatible chipset are not activated. The 71F432 supports PBSRAM operating modes, includ- ing burst read (3-1-1-1), burst write (3-1-1-1) and pipelined burst read or write (3-1-1-1-1-1...). As with all DRAM devices, refresh is required. The memory is not accessible during the refresh interval. Refresh occupies 0.5% of the clock cycles, resulting in a system performance reduction of less than 0.1%. DESCRIPTION: The IDT71F432 MCache is a high-performance, low-power replacement for standard 32K x 32 pipelined burst SRAM (PBSRAM) in cache applications. The 71F432 is built using IDT's Fusion Memory technology, which combines the perfor- mance of SRAM with the cost structure of DRAM. It is How does the performance of Fusion Memory cache RAMs compare with synchronous burst SRAMS? • The Fusion Memory devices equal the performance of the SRAMs they are designed to replace. Are Fusion Memory and PBSRAMs interchangeable? • A system designed to use the Fusion Memory cache RAMs can use standard PBSRAMs instead. What is the difference between MoSys MCache™ and IDT’s Fusion Memory? • MCache is MoSys’ trademark for their cache memory devices. Fusion Memory is IDT’s trademark for the under- lying technology. IDT will use the technology in other products besides cache RAMs. The IDT71F432 and MoSys' MCache devices are interchangeable. ABOUT IDT'S Fusion Memory TECHNOLOGY: What is Fusion Memory? • Fusion Memory is a new kind of memory technology that combines the high performance and ease-of-use of SRAM with the manufacturing costs of DRAM. Why are Fusion Memory chips so much smaller than SRAM? • Traditional SRAM uses four or six transistors to make each memory cell. Fusion Memory uses only one transistor for each memory cell, so the memory array itself is only about 1/4 the size of an SRAM. Is Fusion Memory the same as Dynamic Memory? • Not exactly. While both Fusion Memory and DRAMs use single-transistor dynamic cells for storage, Fusion Memo- ries use much different designs for all the surrounding circuitry, such as address drivers, sense amps, and control circuitry. This gives Fusion Memory a performance level that is much higher than DRAM. If Fusion Memory uses dynamic storage, are there refresh cycles? • Yes, but the refresh control is handled automatically and nearly invisibly, using either on-chip circuitry or circuitry in the chip set used with the memory device. The perfor- mance penalty is typically less than 0.1%. Cost Fusion Memory DRAM SRAM FEATURES: • Uses IDT's Fusion Memory technology • 66 and 75 MHz speed grades • 3-1-1-1 Pipelined Burst Read • 3-1-1-1 Pipelined Burst Write • 3-1-1-1-1-1-1-1... extended pipelined operation • Refresh overhead consumes less than 0.5% of cycles • Pinout is superset of industry standard PBSRAM • Interchangeable with PBSRAM in new designs • Compatible with MoSys MCache™ devices • Low operating and standby power consumption 1/3 the power of standard PBSRAM • Packaged in a JEDEC Standard 100-pin rectangular plastic thin quad flatpack (TQFP) The IDT logo is a registered trademark and Fusion Memory and CacheRAM are trademarks of Integrated Device Technology Pentium is a trademark of Intel Corp. MCache is a trademark of MoSys, Inc. Fusion Memory™ Provides SRAM Performance at DRAM Cost 32K x 32 MCache SYNCHRONOUS PIPELINED CACHE RAM IDT71F432 |
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