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Dynamic random-access memory (dynamic RAM or DRAM) is a type of random-access semiconductor memory that stores each bit of data in a memory cell, usually consisting of a tiny capacitor and a transistor, both typically based on metal–oxide–semiconductor (MOS) technology. While most DRAM memory cell designs use a capacitor and transistor ...
PC-800 RDRAM operated at 400 MHz and delivered 1600 MB/s of bandwidth over a 16-bit bus. It was packaged as a 184-pin RIMM (Rambus in-line memory module) form factor, similar to a DIMM (dual in-line memory module). Data is transferred on both the rising and falling edges of the clock signal, a technique known as DDR. To emphasize the advantages ...
An XDR RAM chip's high-speed signals are a differential clock input (clock from master, CFM/CFMN), a 12-bit single-ended request/command bus (RQ11..0), and a bidirectional differential data bus up to 16 bits wide (DQ15..0/DQN15..0). The request bus may be connected to several memory chips in parallel, but the data bus is point to point; only ...
SDRAM memory module. Synchronous dynamic random-access ... There were a number of 8-bit control registers and 32-bit status registers to control various device timing ...
A module of any particular size can therefore be assembled either from 32 small chips (36 for ECC memory), or 16(18) or 8(9) bigger ones. DDR memory bus width per channel is 64 bits (72 for ECC memory). Total module bit width is a product of bits per chip and number of chips. It also equals number of ranks (rows) multiplied by DDR memory bus width.
The GDDR5 interface transfers two 32-bit wide data words per write clock (WCK) cycle to/from the I/O pins. Corresponding to the 8N-prefetch, a single write or read access consists of a 256-bit wide two CK clock cycle data transfer at the internal memory core and eight corresponding 32-bit wide one-half WCK clock cycle data transfers at the I/O ...
A 64 bit memory chip die, the SP95 Phase 2 buffer memory produced at IBM mid-1960s, versus memory core iron rings 8GB DDR3 RAM stick with a white heatsink Random-access memory ( RAM ; / r æ m / ) is a form of electronic computer memory that can be read and changed in any order, typically used to store working data and machine code .
Data lines and control connected in parallel to a 16-bit data bus, and only chip selects connected independently per channel. To two halves of a 32-bit wide data bus, and the control lines in parallel, including chip select. To two independent 16-bit wide data buses; Each die provides 4, 6, 8, 12, or 16 gigabits of memory, half to each channel ...