Method and apparatus for preventing unauthorized replication of a digital data file. A plurality of second data set samples are substituted for a plurality of user data samples in a user data sequence to generate a combined data set. Error correction codes are calculated to correct errors in the combined data set. Uncorrectable errors are then intentionally written to the error correction codes corresponding to the second data set samples so that, during playback, the readback system conceals th...

A transmission method allowing the reduced amount of hardware in a repeater is disclosed. The overhead portion of a frame is divided into a selected overhead portion for error-correction processing and the non-selected overhead portion for error-correction processing. The non-selected overhead portion such as an overhead for network management can be transferred without error-correction processing, Therefore, a repeater without error-correction processing of the non-selected overhead portion can...

The present invention provides a technique for operating an integrated circuit comprising a plurality of circuit elements, with a plurality of serial test scan chains, each being coupled to a different one of the circuit elements. A scan chain selector is responsive to a specified scan chain specifying value to select a corresponding one of the plurality of test scan chains. A scan chain controller is also provided which has a serial interface for receiving signals from outside of the integrated...

An internal bus information getting method can get information output onto an internal bus to facilitate detection of a malfunction position in a storage element stored in a microcomputer during execution of a user program. The method includes first, setting a target address specifying a memory access that is expected to cause the built-in storage element to malfunction to a register, by executing an interruption handling program. Next, information output onto the internal bus is latched and hel...

A scan circuit (10) has a scan data input (17), a normal data input (18), a clock input (22), a scan enable input (19), a normal data output (23), and a scan data output (24). The scan circuit includes a multiplexer (27) having two data inputs respectively coupled to the scan data input and normal data input of the scan circuit, having a control input coupled to the scan enable input of the scan circuit, and having an output. The scan circuit also includes a D-type flip-flop (28) having a data i...

A novel method and apparatus for encoding input data at a faster rate provides error detection, clock recovery, and reduction of spectral components near DC, and is capable of encoding data while embedding error detection information simultaneously. This encoding scheme may encode all input data in parallel while simultaneously embedding error detection information to quickly and properly encode input data.

The present invention provides a method for generating random jitter test patterns by generating a sequence of maximum-size asynchronous packets according to the P1394b standard and transmitting the sequence to the device under test. The present invention provides a method for generating jitter test patterns by disabling the transmitter data scrambler of the second device; clearing the port_error register of the device under test; and sending a test pattern to said device under test. The present...

Disclosed is an apparatus for detecting a signal received from a channel signal and for transforming this signal into a binary code sequence via a signal processing apparatus, which can perform a maximum likelihood detection of the reproduced data from an optical disk with reduced complexity. Accordingly, a method to detect a signal (EBS) received from a channel signal (HF), comprises the steps of digitizing the signal received from the channel, equalizing the digitized signal (A.sub.k), generat...

Interleavers are used in data transmission and storage applications to introduce diversity into a data stream, thereby making adjacent symbols more independent with respect to a transfer environment of variable quality. Conventional interleavers require storage in whole units of data blocks. This storage requirement complicates implementations for applications where available circuit area is limited and data rates and block sizes are large. A novel interleaver produces an interleaved data block ...

A method for diagnosing failures within an integrated circuit where known diagnostic fault simulators are unable to detect failure mechanisms which do not conform to known failure models. Basic boolean equations are used to describe the internal nodes forming the logic. These equations are then evaluated by way of a good machine simulation to determine which of the equations are (most) true for failing test patterns and (most) false for passing patterns. At the end of the good machine simulation...