Forterra, Inc. manufactures water and drainage pipe and products in the United States and Eastern Canada. It also manufactures structural and specialty precast products, and precast concrete bridge girders; and prestressed concrete, welded steel,â¦.
Called double data rate (or DDR), it let the memory transfer data on both the rising and falling edges of the clock signal, giving it the capability to move information nearly twice as quickly as with regular SDR SDRAM.
Around the year 2000, double data rate random access memory (DDR RAM) was developed. This moved data twice in a single clock cycle -- at the start and end. The introduction of DDR RAM also seems to have changed the definition of SDRAM, as many sources now define it as single data rate RAM. DDR RAM has evolved three times, through DDR2, DDR3 and DDR4.