Abstract: Embodiments of the invention include a controller apparatus, system and method for transferring data between data storage devices within a computer system. The inventive controller apparatus includes device interface logic for connecting the controller to a plurality of data storage devices, e.g., a hard disk device and a CD-RW device, and host interface logic for connecting the controller to a host or host computer via a bus such as a PCI bus. The host includes a number of other components, e.g., a host memory, connected thereto. The controller includes switching circuitry that allows data to be transferred directly from the source data storage device to at least one destination data storage device, i.e., without the transferred data passing from the controller through the bus to the host and/or the host memory.

Abstract: The use of the JTAG port provides for boundary scan testing of integrated circuits, thereby allowing for the testing of IC's after they have been mounted into a circuit board. However, the conventional JTAG scheme is limited as to speed, since both the input and output vectors must be serially shifted in and out of I/O buffers along the chip boundaries. The present invention speeds the testing of high-speed core logic circuitry by transferring the test program to a special test data register, which downloads the program to the logic circuitry under test, and uploads the results. This allows the core logic to perform the test at its normal operating speed, while still retaining compatibility with the JTAG standard for other tests.

Abstract: A semiconductor memory circuit is arranged with an ordinary crosspoint row-column array of dynamic capacitor memory storage cells. Word serial content addressing is enabled by adding a separate combinational logic device, only one such device for each entire column bit line, typically comprising a comparator feeding a NAND gate to which masking data can be supplied.

Abstract: This disclosure pertains to a digitalized music synthesizer functioning in the real time domain to continuously update, in an asynchronous manner, a continuing approximation of a desired waveform by utilizing its memory of the recent history of the operation of the keyboard of the apparatus. A real time clock and a microcomputer are both driven by a single crystal oscillator, operating at any arbitrary frequency that need not correspond with the frequency of the fundamental or harmonic waves to be produced by the apparatus. A memory of the recent history of keyboard events is maintained. The microcomputer utilizes an algorithm employing square waves as a basis and a differential correcting technique which minimizes the quantity of square wave defining terms that need be computed by only recomputing at each time, corrections to the previous computation.