Search results
Results from the WOW.Com Content Network
The static qualifier differentiates SRAM from dynamic random-access memory (DRAM): SRAM will hold its data permanently in the presence of power, while data in DRAM decays in seconds and thus must be periodically refreshed. SRAM is faster than DRAM but it is more expensive in terms of silicon area and cost.
Pseudostatic RAM (PSRAM or PSDRAM) is dynamic RAM with built-in refresh and address-control circuitry to make it behave similarly to SRAM. It combines the high density of DRAM with the ease of use of true SRAM. PSRAM (made by Numonyx) is used in the Apple iPhone and other embedded systems. [17] Some DRAM components have a self-refresh standby mode.
It is a set of small DRAM banks with an SRAM cache in front to make it behave much like a true SRAM. It is used in Nintendo GameCube and Wii video game consoles. Cypress Semiconductor's HyperRAM [72] is a type of PSRAM supporting a JEDEC-compliant 8-pin HyperBus [73] or Octal xSPI interface.
Double Data Rate 4 Synchronous Dynamic Random-Access Memory (DDR4 SDRAM) is a type of synchronous dynamic random-access memory with a high bandwidth ("double data rate") interface. Released to the market in 2014, [ 2 ] [ 3 ] [ 4 ] it is a variant of dynamic random-access memory (DRAM), some of which have been in use since the early 1970s, [ 5 ...
However, since an SRAM cell consists of several transistors, typically four or six, its density is much lower than DRAM. This makes it expensive, which is why it is used only for small amounts of high-performance memory, notably the CPU cache in almost all modern central processing unit designs.
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 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. CAM ( Content-addressable memory ) – This is a specialized type in which, instead of accessing data using an address, a data word is applied and the memory returns the location if the ...
Due to its one-transistor bit cell, 1T-SRAM is smaller than conventional (six-transistor, or "6T") SRAM, and closer in size and density to embedded DRAM . At the same time, 1T-SRAM has performance comparable to SRAM at multi-megabit densities, uses less power than eDRAM and is manufactured in a standard CMOS logic process like conventional SRAM.