Semiconductor integrated circuit for signal processing of optical disk of write-once type and semiconductor device

A semiconductor integrated circuit for processing a signal of an optical disk of a write-once type, comprising;

• an EFM demodulating circuit for demodulating an EFM-modulated EFM signal read from the optical disk;
• an EFM modulating circuit for EFM-modulating data written on the optical disk;
• an ATIP demodulating circuit for demodulating an ATIP signal read from the optical disk;
• a CLV control circuit for outputting a signal for controlling rotation of the optical disk based on said EFM signal or said ATIP signal;
• a subcode forming arithmetic circuit for performing a CRC operation with respect to the data to be written on the optical disk thereby to form a subcode and for extracting the subcode from said EFM signal and performing the CRC operation of the subcode;
• a CIRC modulating/demodulating circuit for detecting and correcting an error in CIRC signal from said EFM-demodulated signal and adding a CIRC error correction code to the data to be written on the optical disk;
• an interface circuit for outputting and inputting an audio signal or data;
• and
• an interface circuit for interfacing with a data bus of a processor for an external system controller;
• wherein the semiconductor integrated circuit further comprises a circuit for processing a signal of the optical disk of the write-once type;
• said signal processing circuit comprising:
• an extracting circuit for measuring a switching edge interval of the ATIP signal read out of the optical disk by using a reference clock signal, and for extracting a first clock signal used for extracting the edge of the ATIP signal and a second clock signal used for storing the ATIP signal;
• a shift register for storing the ATIP signal in synchronization with the extracted second clock signal;
• and
• a judging circuit for performing an exclusive OR operation with respect to first and second outputs from the shift register and correcting the first clock signal if it is incorrect.

A semiconductor integrated circuit for processing a signal of an optical disk of a write-once type, comprising:

• an EFM demodulating circuit for demodulating an EFM-modulated EFM signal read from the optical disk;
• an EFM modulating circuit for EFM-modulating data written on the optical disk;
• an ATIP demodulating circuit for demodulating an ATIP signal read from the optical disk;
• a CLV control circuit for outputting a signal for controlling rotation of the optical disk based on said EFM signal or said ATIP signal;
• a subcode forming arithmetic circuit for performing a CRC operation with respect to the data to be written on the optical disk thereby to form a subcode and for extracting the subcode from said EFM signal and performing the CRC operation of the subcode;
• a CIRC modulating/demodulating circuit for detecting and correcting an error in CIRC signal from said EFM-demodulated signal and adding a CIRC error correction code to the data to be written on the optical disk;
• an interface circuit for outputting and inputting an audio signal or data;
• and
• an interface circuit for interfacing with a data bus of a processor for an external system controller;
• wherein the semiconductor integrated circuit further comprises a signal processing circuit for writing data to the optical disk of the write-once type;
• said signal processing circuit comprising:
• memory means for storing the data written to the optical disk;
• first non-volatile memory means for storing respective predetermined parameter values corresponding to data read out of said memory means;
• second non-volatile memory means for storing a usable pattern based on the parameter values;
• means for calculating a total digital counting value;
• priority degree calculating means for calculating a priority degree of the pattern based on the total digital counting value calculated by said calculating means;
• and
• means for selecting a single pattern to be outputted from the second non-volatile memory means and storing said pattern on the basis of an output of the priority degree calculating means.

A semiconductor integrated circuit for processing a signal of an optical disk of a write-once type, comprising:

• an EFM demodulating circuit for demodulating an EFM-modulated EFM signal read from the optical disk;
• an EFM modulating Circuit for EFM-modulating data written on the optical disk;
• an ATIP demodulating circuit for demodulating an ATIP signal read from the optical disk;
• a CLV control circuit for outputting a signal for controlling rotation of the optical disk based on said EFM signal or said ATIP signal;
• a subcode forming arithmetic circuit for performing a CRC operation with respect to the data to be written on the optical disk thereby to form a subcode and for extracting the subcode from said EFM signal and performing the CRC operation of the subcode;
• a CIRC modulating/demodulating circuit for detecting and correcting an error in CIRC signal from said EFM-demodulated signal and adding a CIRC error correction code to the data to be written on the optical disk;
• an interface circuit for outputting and inputting an audio signal or data;
• and
• an interface circuit for interfacing with a data bus of a processor for an external system controller;
• wherein the semiconductor integrated circuit further comprises a signal processing circuit for adding a margin bit to the data written to the optical disk of the write-once type,
• said signal processing circuit including;
• memory means for storing the data written to the optical disk,
• first non-volatile memory means for storing a first value obtained by subtracting a value 1 from a length of data having the same value at an end thereof, a length value of data having the same value at a head thereof, and a total digital counting value in a data unit, in accordance with the data read out of said memory means,
• second non-volatile memory means for storing a usable pattern based on the first value and the length value of data having the same value at the head thereof,
• means for calculating the total digital counting value
• priority degree calculating means for calculating a priority degree of the pattern based on the total digital counting value calculated by said calculating means, and
• means for selecting a single pattern to be outputted from the memory means on the basis of an output of the priority degree calculating means.

A semiconductor device comprising:

• an EFM demodulating circuit for demodulating an EFM-modulated EFM signal read from an optical disk;
• an EFM modulating circuit for EFM-modulating data written to the optical disk;
• an ATIP demodulating circuit for demodulating an ATIP signal read from the optical disk;
• a CLV control circuit for outputting a signal for controlling rotation of the optical disk based on said EFM signal or said ATIP signal;
• a subcode forming arithmetic circuit for performing a CRC operation with respect to the data to be written on the optical disk thereby to form a subcode and for extracting the subcode from said EFM signal and performing the CRC operation of the subcode;
• a CIRC modulating/demodulating circuit for detecting and correcting an error in a CIRC signal form said EFM-demodulated signal and for adding a CIRC error correction code to the data written to the optical disk:
• an interface circuit for outputting and inputting an audio signal or data;
• and
• an interface circuit for interfacing with a data bus of a processor for an external system controller;
• said semiconductor device being constructed such that at least two of said EFM demodulating circuit, EFM modulating circuit, ATIP demodulating circuit, CLV control circuit, subcord forming arithmetic circuit, and CIRC modulating demodulating circuit are formed on the same semiconductor substrate;
• wherein the semiconductor device further comprises a controller for controlling the rotation of the optical disk of a write-once type;
• said controller comprising:
• means for measuring the length of a top or bottom of each signal pattern of a binary EFM input signal by using an internal reference clock signal;
• means for judging whether or not the length of the top or bottom is three to eleven times a unit length;
• and
• motor control means for decelerating the rotation of the optical disk when a signal pattern having a top and bottom equal to or smaller than twice the unit length is detected by the judging means and accelerating the rotation of the optical disk when the signal pattern having a top or bottom equal to or greater than twelve times the unit length is detected by the judging means.

A semiconductor device comprising:

• an EFM demodulating circuit for demodulating an EFM-modulated EFM signal read from an optical disk;
• an EFM modulating circuit for EFM-modulating data written to the optical disk;
• an ATIP demodulating circuit for demodulating an ATIP signal read from the optical disk;
• a CLV control circuit for outputting a signal for controlling rotation of the optical disk based on said EFM signal or said ATIP signal;
• a subcode forming arithmetic circuit for performing a CRC operation with respect to the data to be written on the optical disk thereby to form a subcode and for extracting the subcode from said EFM signal and performing the CRC operation of the subcode;
• a CIRC modulating/demodulating circuit for detecting and correcting an error in a CIRC signal form said EFM-demodulated signal and for adding a CIRC error correction code to the data written to the optical disk;
• an interface circuit for outputting and inputting an audio signal or data;
• and
• an interface circuit for interfacing with a data bus of a processor for an external system controller;
• said semiconductor device being constructed such that at least two of said EFM demodulating circuit, EFM modulating circuit, ATIP demodulating circuit, CLV control circuit, subcord forming arithmetic circuit, and CIRC modulating/demodulating circuit are formed on the same semiconductor substrate;
• wherein the semiconductor device further comprises a circuit for processing a signal of the optical disk of a write-once type;
• said signal processing circuit comprising:
• an extracting circuit for measuring a switching edge interval of the ATIP signal read out of the optical disk by using a reference clock signal, and for extracting a first clock signal used for extracting the edge of the ATIP signal and a second clock signal used for storing the ATIP signal;
• a shift register for storing the ATIP signal in synchronization with the extracted second clock signal;
• and
• a judging circuit for performing an exclusive OR operation with respect to first and second outputs from the shift register and correcting the first clock signal if it is incorrect, said first clock being used for extracting the edge of the ATIP signal.

A semiconductor device comprising:

• an EFM demodulating circuit for demodulating an EFM-modulated EFM signal read from an optical disk;
• an EFM modulating circuit for EFM-modulating data written to the optical disk;
• an ATIP demodulating circuit for demodulating an ATIP signal read from the optical disk;
• a CLV control circuit for outputting a signal for controlling rotation of the optical disk based on said EFM signal or said ATIP signal;
• a subcode forming arithmetic circuit for performing a CRC operation with respect to the data to be written on the optical disk thereby to form a subcode and for extracting the subcode from said EFM signal and performing the CRC operation of the subcode;
• a CIRC modulating/demodulating circuit for detecting and correcting an error in a CIRC signal form said EFM-demodulated signal and for adding a CIRC error correction code to the data written to the optical disk;
• an interface circuit for outputting and inputting an audio signal or data;
• and
• an interface circuit for interfacing with a data bus of a processor for an external system controller;
• said semiconductor device being constructed such that at least two of said EFM demodulating circuit EFM modulating circuit ATIP demodulating circuit, CLV control circuit, subcord forming arithmetic circuit, and CIRC modulating/demodulating circuit are formed on the same semiconductor substrate;
• wherein the semiconductor device further comprises a signal processing circuit for writing data to the optical disk of a write-once type;
• said signal processing circuit comprising:
• memory means for storing the data written to the optical disk,
• first non-volatile memory means for storing respective predetermined parameter values corresponding to data read out of said memory means,
• second non-volatile memory means for storing a usable pattern based on the parameter values,
• means for calculating a total digital counting value;
• priority degree calculating means for calculating a priority degree of the pattern based on the total digital counting value calculated by said calculating means;
• and
• means for selecting a single pattern to be outputted from the second non-volatile memory means and storing said pattern on the basis of an output of the priority degree calculating means.

A semiconductor device comprising:

• an EFM demodulating circuit for demodulating an EFM-modulated EFM signal read from an optical disk;
• an EFM modulating circuit for EFM-modulating data written to the optical disk;
• an ATIP demodulating circuit for demodulating an ATIP signal read from the optical disk;
• a CLV control circuit for outputting a signal for controlling rotation of the optical disk based on said EFM signal or said ATIP signal;
• subcode forming arithmetic circuit for performing a CRC operation with respect to the data to be written on the optical disk thereby to form a subcode and for extracting the subcode from said EFM signal and performing the CRC operation of the subcode;
• a CIRC modulating/demodulating circuit for detecting and correcting an error in a CIRC signal form said EFM-demodulated signal and for adding a CIRC error correction code to the data written to the optical disk;
• an interface circuit for outputting and inputting an audio signal or data;
• and
• an interface circuit for interfacing with a data bus of a processor for an external system controller;
• said semiconductor device being constructed such that at least two of said EFM demodulating circuit, EFM modulating circuit, ATIP demodulating circuit, CLV control circuit, subcord forming arithmetic circuit, and CIRC modulating/demodulating circuit are formed on the same semiconductor substrate;
• wherein the semiconductor device further comprises a signal processing circuit for adding a margin bit to the data written to the optical disk of a write-once type;
• said signal processing circuit comprising:
• memory means for storing the data written to the optical disk,
• first non-volatile memory means for storing a first value obtained by subtracting a value 1 from a length of data having the same value at an end thereof, a length value of data having the same value at a head thereof, and a total digital counting value in a data unit, in accordance with the data read out of said memory means,
• second non-volatile memory means for storing a usable pattern based on the first value and the length value of data having the same value at the head thereof,
• means for calculating the total digital counting value;
• priority degree calculating means for calculating a priority degree of the pattern based on the total digital counting value calculated by said calculating means, and
• means for selecting a single pattern to be outputted from the memory means on the basis of an output of the priority degree calculating means.