Abstract: An enhanced bus turnaround integrated circuit dynamic random access memory ("DRAM") device of particular utility in providing maximum DRAM performance while concomitantly affording a device with may be readily integrated into systems designed to use zero bus turnaround ("ZBT"), or pipeline burst static random access memory ("SRAM") devices. The enhanced bus turnaround DRAM device of the present invention provides much of the same benefits of a conventional ZBT SRAM device with a similar pin-out, timing and function set while also providing improvements in device density, power consumption and cost approaching that of straight DRAM memory. Through the provision of a "Wait" pin, the enhanced bus turnaround device of the present invention can signal the system memory controller when additional wait states must be added yet still provide virtually identical data access time performance to that of ZBT SRAM for all Read and Write operations with a burst length of four or greater.

Abstract: A flow blockage suction interrupt of the present invention reduces the dangerous possibility of bodily suction entrapment of a bather in a swimming, wading, or hydrotherapy pool. The safety valve operates to instantaneously introduce atmosphere into a suction piping system of a pool when a dangerous vacuum condition is detected. The incoming atmosphere breaks the vacuum, freeing entrapped bather. The safety valve includes a dynamic plug and dual spring-loaded actuators, one closing and one opening the valve to atmosphere. The closing actuator is dominant until the opening actuator is triggered by the dangerously high vacuum level that accompanies bodily suction entrapment. The preferred embodiment incorporates a spring-loaded telescopic actuator shaft that is spring-loaded to open fully once triggered, and is triggered by a factory-calibrated diaphragm-actuated suction sensor. Once this safety valve has been tripped, it must be manually reset by the pool operator.