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Two additional access transistors serve to control the access to a storage cell during read and write operations. 6T SRAM is the most common kind of SRAM. [20] In addition to 6T SRAM, other kinds of SRAM use 4, 5, 7, [ 21 ] 8, 9, [ 20 ] 10 [ 22 ] (4T, 5T, 7T 8T, 9T, 10T SRAM), or more transistors per bit.
Mosys uses a single-transistor storage cell (bit cell) like dynamic random-access memory (DRAM), but surrounds the bit cell with control circuitry that makes the memory functionally equivalent to SRAM (the controller hides all DRAM-specific operations such as precharging and refresh). 1T-SRAM (and PSRAM in general) has a standard single-cycle ...
It is used in a few game consoles such as the Wii. SRAM (Static random-access memory) – This stores each bit of data in a circuit called a flip-flop, made of 4 to 6 transistors. SRAM is less dense and more expensive per bit than DRAM, but faster and does not require memory refresh. It is used for smaller cache memories in computers.
SRAM typically has six-transistor cells, whereas DRAM (dynamic random-access memory) typically has single-transistor cells. [ 17 ] [ 15 ] In 1965, Toshiba 's Toscal BC-1411 electronic calculator used a form of capacitive bipolar DRAM, storing 180-bit data on discrete memory cells, consisting of germanium bipolar transistors and capacitors.
Commercial use of SRAM began in 1965, when IBM introduced the SP95 memory chip for the System/360 Model 95. [ 11 ] Dynamic random-access memory (DRAM) allowed replacement of a 4 or 6-transistor latch circuit by a single transistor for each memory bit, greatly increasing memory density at the cost of volatility.
SRAM consists of a series of transistors arranged in a flip-flop, which will hold one of two states as long as power is applied. Since the transistors have a very low power requirement, their switching time is very low. However, since an SRAM cell consists of several transistors, typically four or six, its density is much lower than DRAM.
Quad Data Rate (QDR) SRAM is a type of static RAM computer memory that can transfer up to four words of data in each clock cycle. Like Double Data-Rate (DDR) SDRAM, QDR SRAM transfers data on both rising and falling edges of the clock signal. The main purpose of this capability is to enable reads and writes to occur at high clock frequencies ...
SRAM is used for CPU cache. SRAM is also found in small embedded systems requiring little memory. SRAM retains its contents as long as the power is connected and may use a simpler interface, but commonly uses six transistors per bit. Dynamic RAM is more complicated for interfacing and control, needing regular refresh cycles to prevent losing ...