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Small SRAM buffers are also found in CDROM and CDRW drives to buffer track data, which is transferred in blocks instead of as single values.
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LCD screens and printers also normally employ SRAM to hold the image displayed or to be printed. SRAM is also used in personal computers, workstations, routers and peripheral equipment: internal CPU caches and external burst mode SRAM caches, hard disk buffers, router buffers, etc. Several megabytes of SRAM may be used in complex products such as digital cameras, cell phones, synthesizers, etc. Many categories of industrial and scientific subsystems, automotive electronics, and similar, contains static RAM.
#Static chip writer portable#
In this case, SRAMs are used in most portable equipment because the DRAM refresh current is several orders of magnitude more than the low-power SRAM standby current. The second driving force for SRAM technology is low power applications. In the first role, the SRAM serves as cache memory, interfacing between DRAMs and the CPU. In contrast, the main memory in a computer is typically dynamic RAM (DRAM, D-RAM).Īn SRAM is designed to fill two needs: to provide a direct interface with the CPU at speeds not attainable by DRAMs and to replace DRAMs in systems that require very low power consumption. SRAM is generally used for high-speed registers, caches and relatively small memory banks such as a frame buffer on a display adapter. Due to its high cost, SRAM is often used only as a memory cache.įig1: Typical microprocessor memory configuration Unfortunately, it is also much more expensive to produce than DRAM. In addition, its cycle time is much shorter than that of DRAM because it does not need to pause between accesses. While DRAM supports access times (access time is the time required to read or write data to/from memory) of about 60 nanoseconds, SRAM can give access times as low as 10 nanoseconds. SRAM is faster and more reliable than the more common DRAM. In SRAM the data is lost when the memory is not electrically powered. Compared to Dynamic RAM (DRAM), SRAM does't have a capacitor to store the data, hence SRAM works without refreshing. SRAM uses bistable latching circuitry made of Transistors/MOSFETS to store each bit. Static Random Access Memory (SRAM) is a type of volatile semiconductor memory to store binary logic '1' and '0' bits. Embedded Systems Course- module 15: SRAM memory interface to microcontroller in embedded systems