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Synchronous dynamic random-access memory (SDRAM) is any dynamic random-access memory (DRAM) where the operation of its external pin interface is coordinated by an externally supplied clock signal. DRAM integrated circuits (ICs) produced from the early 1970s to early 1990s used an asynchronous interface, in which input control signals have a direct effect on internal functions only delayed by the trip across its semiconductor pathways. SDRAM has a synchronous interface, whereby changes on control inputs are recognised after a rising edge of its clock input. In SDRAM families standardized by JEDEC, the clock signal controls the stepping of an internal finite state machine that responds to incoming commands. These commands can be pipelined to improve performance, with previously started operations completing while new commands are received. The memory is divided into several equally sized but independent sections called banks, allowing the device to operate on a memory access command in each bank simultaneously and speed up access in an interleaved fashion. This allows SDRAMs to achieve greater concurrency and higher data transfer rates than asynchronous DRAMs could.
Pipelining means that the chip can accept a new command before it has finished processing the previous one. For a pipelined write, the write command can be immediately followed by another command without waiting for the data to be written into the memory array. For a pipelined read, the requested data appears a fixed number of clock cycles (latency) after the read command, during which additional commands can be sent.
The first commercial SDRAM was the Samsung KM48SL2000 chip, introduced in 1992. SDRAM is widely used in computers. Beyond the original SDRAM, further generations of double data rate RAM have entered the mass market – DDR (also known as DDR1), DDR2, DDR3, and DDR4, with the latest generation (DDR4) released in the second half of 2014.
Brand new sba3 brace with bcm buffer tube kit + h2 buffer, fully functional folding stock adapter. "Light machine work on bcg extention for proper fitting" and American made tactical forged 80% lower reciever. Selling as a complete set. Will not part out. $350
I have an AP m5 lower and just raised I have the lower parts kit also.
So I figured I would start building, but need a buffer tube etc.
I think I would either build it as a 308 or 6.5cm.
I would probably be looking at a 16 or 18 inch barrel, not going super long precision at this point...
A few lose items available. All brand new, unused, never installed. Will ship flat rate on buyer's dime. No trades.
$5 ea - CMMG A2 pistol grips (2 available)
$10 - Black dual or single point QD sling. Unknown brand, Amazon purchase.
$30 - LBE Carbine Buffer w/ Carbine spring and Mil-spec...
New in box, plastic packaging never opened. I was a bit impulsive when I bought this and changed my mind about the buffer & stock system I want.
Will trade straight across for an excellent condition (but not necessarily NIB) Aero Precision M5 308 rifle length buffer kit.
Price is firm, already...
Cross posted on the web