Abstract: Apparatus and an associated method calculates a CRC remainder for a block of data, such as a block of data retrieved from a CD-ROM device. CRC calculations are performed to provide assurances of data integrity subsequent to error corrections of the block of data. CRC remainders associated with N powers of two are stored in the look-up table. When calculating the CRC remainder, selected values stored in the look-up table are retrieved and combined to form the CRC remainder for the block of data.

Abstract: A virtual monitor controller includes a data storage device coupled to receive and output data; an instruction storage device coupled to receive and output instructions; a status storage device coupled to receive and output status data; and a mode storage device coupled to receive and output mode data. The virtual monitor controller is included in a debugger/monitor controller. A debugger/monitor system comprises a host system; the debugger/monitor controller; and a digital processor. Preferably, the controller is coupled between the processor and IC logic. A method of operating a virtual monitor comprises the steps of intercepting an instruction fetch from a microprocessor; downloading instructions from a host computer; and operating the microprocessor with the instructions. Preferably, the instructions are sequentially downloaded.

Abstract: A digital data separator is provided for separating clock information and data from a data stream which is subject to varying amounts of undesired jitter which tend to corrupt the data. A read data window of controlled duration is generated for sampling the input data. The current best estimate of the duration of the read data window is stored in a period register as a period register value. The period register value minus one is loaded into a time register as the time register value. A count down cycle is performed by subtracting a value of one from the time register value in each clock cycle during the course of the count down cycle. The read data window is toggled to begin a new read data window when the time register value is near zero, the value remaining in the time register being designated the remaining value.