Abstract: A combined error checker and sequence generator which shares a LFSR is disclosed which reduces complexity, cost, and area required for implementation while also improving timing margin. A clock and data recovery system recovers a data signal received over a channel from a remote transceiver. Control logic selects different modes of operation of the system. An error detector compares the two sequence signals and records errors in response to differences between the two sequence signals. A sequence generator generates a sequence signal for use by the error detector as a reference sequence signal or for transmission to a remote transceiver. The system includes one or more switching elements configured to selectively route the generated sequence as feedback into the sequence generator or the received sequence signal into the sequence generator subject to whether the combined error checker and sequence generator is in error checker mode or sequence generator mode.

Abstract: A combined error checker and sequence generator which shares a LFSR is disclosed which reduces complexity, cost, and area required for implementation while also improving timing margin. A clock and data recovery system recovers a data signal received over a channel from a remote transceiver. Control logic selects different modes of operation of the system. An error detector compares the two sequence signals and records errors in response to differences between the two sequence signals. A sequence generator generates a sequence signal for use by the error detector as a reference sequence signal or for transmission to a remote transceiver. The system includes one or more switching elements configured to selectively route the generated sequence as feedback into the sequence generator or the received sequence signal into the sequence generator subject to whether the combined error checker and sequence generator is in error checker mode or sequence generator mode.

Abstract: A method for optimizing the optical disc writing parameters, comprising the steps: acquiring the variable of a mark runlength; determining a modulation amount of the writing parameters based on a relationship between the variable of the mark runlength and the modulation amount of the writing parameters; and modulating the writing parameters. The method is applicable to multifarious optical disc systems, it can adopt multifarious strategies for the writing process, it can optimize the power or the starting time and the stopping time of a plurality of laser pulses, thereby it can get the aim of optimizing the mark runlength.

Abstract: A kind of optical disc consists of the first layer, the second layer and the in-between layer, which lies between the first layer and the second layer. The first layer with its surface undulant includes material used to record information. The second layer with its surface basically flat includes material used to record information referring to the undulation of the first layer. The method to manufacture this optical disc comprises the steps of forming undulant first layer; forming the in-between layer on the surface of the first layer; and then forming the second layer. The first layer includes material used to record information, and the second layer includes material used to record information referring to the undulation of the first layer.