公开(公告)号：US07987404B2

公开(公告)日：2011-07-26

申请号：US11721446

申请日：2005-12-21

申请人： Junichi Fukuda ,  Hisato Matsuo

发明人： Junichi Fukuda ,  Hisato Matsuo

IPC分类号： H03M13/00

CPC分类号： G11B20/1803 ,  G11B20/1833 ,  G11B2020/10629 ,  G11B2020/1823 ,  G11B2020/1853 ,  G11B2220/90

摘要： A method for transferring corrected data to an external buffer within a tape drive is provided. After the receipt of data from a data recording medium, the data are stored in an external buffer. The data are then transferred from the external buffer to an error correction code (ECC) device. Any error in the data within the ECC device are corrected. The corrected data are subsequently divided into multiple sub-units, and a transfer flag is added to each of the sub-units having corrected data. Only the sub-units having corrected data are transferred from the ECC device back to the external buffer.

摘要翻译： 提供了一种用于将校正数据传送到磁带机内的外部缓冲器的方法。 在从数据记录介质接收数据之后，将数据存储在外部缓冲器中。 然后将数据从外部缓冲器传送到纠错码（ECC）设备。 纠正ECC设备内的数据错误。 校正后的数据随后被分成多个子单元，并将传送标志加到具有校正数据的每个子单元中。 只有具有校正数据的子单元才从ECC设备传送回外部缓冲器。

公开(公告)号：US07965462B2

公开(公告)日：2011-06-21

申请号：US12351725

申请日：2009-01-09

申请人： Masayuki Demura ,  Glen A. Jaquette ,  Hisato Matsuo ,  Keisuke Tanaka

发明人： Masayuki Demura ,  Glen A. Jaquette ,  Hisato Matsuo ,  Keisuke Tanaka

IPC分类号： G11B20/16

CPC分类号： G11B20/1201 ,  G11B20/18 ,  G11B20/1866 ,  G11B2020/1222 ,  G11B2220/90 ,  H03M13/271 ,  H03M13/2909

摘要： Methods, logic, apparatus and computer program product write data, comprising less than a full Data Set, to magnetic tape. Data is received from a host, a do-not-interleave command is issued and C1 and C2 ECC are computed. Codeword Quad (CQ) sets are then formed. At least one CQ set of the Data Set is written to a magnetic tape in a non-interleaved manner and a Data Set Information Table (DSIT) is written to the magnetic tape immediately following the at least one written CQ set. An address transformation may be used to cancel interleaving. Writing a CQ set may include writing a plurality of contiguous instances of the CQ set to the magnetic tape to maintain the effectiveness of ECC capability.

摘要翻译： 方法，逻辑，设备和计算机程序产品写入数据，包括少于一个完整的数据集，到磁带。 从主机接收数据，发出不交错命令，并计算C1和C2 ECC。 然后形成Codeword Quad（CQ）集合。 将数据集的至少一个CQ集以非交错方式写入磁带，并且数据集信息表（DSIT）被写入紧跟在至少一个写入的CQ集之后的磁带上。 可以使用地址变换来取消交织。 编写CQ集可以包括将CQ集的多个连续实例写入磁带以保持ECC能力的有效性。

公开(公告)号：US08412891B2

公开(公告)日：2013-04-02

申请号：US12916668

申请日：2010-11-01

申请人： Masayuki Demura ,  Hisato Matsuo ,  Keisuke Tanaka

发明人： Masayuki Demura ,  Hisato Matsuo ,  Keisuke Tanaka

IPC分类号： G06F12/12 ,  G06F13/18 ,  G06F13/34

CPC分类号： G06F13/161 ,  G06F13/1673 ,  Y02D10/14

摘要： Memory access arbitration allowing a shared memory to be used both as a memory for a processor and as a buffer for data flows, including an arbiter unit that makes assignment for access requests to the memory sequentially and transfers blocks of data in one round-robin cycle according to bandwidths required for the data transfers, sets priorities for the transfer blocks so that the bandwidths required for the data transfers are met by alternate transfer of the transfer blocks, and executes an access from the processor with an upper limit set for the number of access times from the processor to the memory in one round-robin cycle so that the access from the processor with the highest priority and with a predetermined transfer length exerts less effect on bandwidths for data flow transfers in predetermined intervals between the transfer blocks.

摘要翻译： 存储器访问仲裁允许共享存储器既用作处理器的存储器又用作数据流的缓冲器，包括仲裁器单元，其顺序地对存储器的访问请求进行分配，并在一个循环周期中传送数据块 根据数据传输所需的带宽，设置传输块的优先级，使得通过传输块的交替传送来满足数据传输所需的带宽，并且执行对处理器的访问，其具有为 在一个循环周期中从处理器到存储器的访问时间，使得来自具有最高优先级并且具有预定传送长度的处理器的访问对传输块之间的预定间隔中的数据流传输的带宽的影响较小。

公开(公告)号：US08276045B2

公开(公告)日：2012-09-25

申请号：US12351738

申请日：2009-01-09

申请人： Roy D. Cideciyan ,  Evangelos S. Eleftheriou ,  Hisato Matsuo ,  Thomas Mittelholzer ,  Paul J. Seger ,  Keisuke Tanaka

发明人： Roy D. Cideciyan ,  Evangelos S. Eleftheriou ,  Hisato Matsuo ,  Thomas Mittelholzer ,  Paul J. Seger ,  Keisuke Tanaka

IPC分类号： G11C29/00

CPC分类号： H03M13/2909 ,  G11B20/1202 ,  G11B20/1833 ,  G11B20/1866 ,  G11B2020/1836 ,  G11B2020/1853 ,  G11B2220/93 ,  H03M13/15 ,  H03M13/1515

摘要： Conventional C2 coding and interleaving for multi-track data tape in LTO-3/4 do not support recording data onto a number of concurrent tracks which is not a power of two. Higher-rate longer C2 codes, which do not degrade error rate performance, are provided. An adjustable format and interleaving scheme accommodates future tape drives in which the number of concurrent tracks is not necessarily a power of two. A data set is segmented into a plurality of unencoded subdata sets and parity bytes are generated for each row and column. The parameters of the C2 code include N2 as the least common multiple of the number of possible tracks to which codeword objects are to be written. COs are formed from N2 C1 codewords, mapped onto a logical data track according to information within headers of the CO and modulation encoded into synchronized COs which are written to the tape.

摘要翻译： LTO-3/4中的多轨数据磁带的常规C2编码和交织不支持将数据记录到不是2的幂的多个并发磁道上。 提供了更高速率的更长的C2代码，这不会降低错误率性能。 可调格式和交错方案适应将来的磁带驱动器，其中并发轨道的数量不一定是二的幂。 将数据集分割为多个未编码的子数据集，并为每行和列生成奇偶校验字节。 C2码的参数包括N2作为要写入码字对象的可能轨道数的最小公倍数。 CO由N 2 C1码字形成，根据被写入到磁带的编码到同步的CO中的CO和报头中的信息映射到逻辑数据轨道。

公开(公告)号：US08094397B2

公开(公告)日：2012-01-10

申请号：US12350108

申请日：2009-01-07

申请人： Evangelos S. Eleftheriou ,  Robert Allen Hutchins ,  Hisato Matsuo ,  Sedat Oelcer

发明人： Evangelos S. Eleftheriou ,  Robert Allen Hutchins ,  Hisato Matsuo ,  Sedat Oelcer

IPC分类号： G11B5/09

CPC分类号： G11B20/10009 ,  G11B20/10055 ,  G11B20/10175 ,  G11B20/10222 ,  G11B2220/90

摘要： A system in one embodiment includes multiple analog inputs for receiving readback signals, an analog to digital converter coupled to each of the analog inputs for converting the readback signals to digital signals, a buffer coupled to outputs of the analog to digital converters for at least temporarily storing the digital signals, and a digital processing section also coupled to outputs of the analog to digital converters for processing the digital signals for reconstructing data therefrom. A method in one embodiment includes receiving multiple channels of analog readback signals from a magnetic head, converting the analog signals in each channel to digital signals, buffering the digital signals, and outputting the buffered digital signals. A method in another embodiment includes receiving a readback waveform from a magnetic storage device, reducing a frequency offset of the readback waveform, and generating a synchronized, oversampled waveform from the readback waveform.

摘要翻译： 一个实施例中的系统包括用于接收回读信号的多个模拟输入，耦合到每个模拟输入的模数转换器，用于将回读信号转换成数字信号;耦合到模数转换器的输出的缓冲器，用于至少暂时地 存储数字信号，以及数字处理部分，其耦合到模数转换器的输出端，用于处理数字信号以从其重构数据。 一个实施例中的方法包括从磁头接收多个通道的模拟回读信号，将每个通道中的模拟信号转换成数字信号，缓冲数字信号，并输出缓冲的数字信号。 另一实施例中的方法包括从磁存储设备接收回读波形，减少回读波形的频率偏移，以及从回读波形生成同步的过采样波形。

公开(公告)号：US07876516B2

公开(公告)日：2011-01-25

申请号：US12351747

申请日：2009-01-09

申请人： Roy D. Cideciyan ,  Evangelos S. Eleftheriou ,  Hisato Matsuo ,  Thomas Mittelholzer ,  Paul J. Seger ,  Keisuke Tanaka

发明人： Roy D. Cideciyan ,  Evangelos S. Eleftheriou ,  Hisato Matsuo ,  Thomas Mittelholzer ,  Paul J. Seger ,  Keisuke Tanaka

IPC分类号： G11B5/09 ,  G11B20/14

CPC分类号： G11B20/1833 ,  G11B20/1201 ,  G11B20/1866 ,  G11B2020/1287 ,  G11B2020/1289 ,  G11B2020/1446 ,  G11B2020/1836 ,  G11B2220/93 ,  H03M13/27 ,  H03M13/271

摘要： For writing data to multi-track tape, a received data set is received and segmented into unencoded subdata sets, each comprising an array having K2 rows and K1 columns. For each unencoded subdata set, N1-K1 C1-parity bytes are generated for each row and N2-K2 C2-parity bytes are generated for each column. The C1 and C2 parity bytes are appended to the ends of the row and column, respectively, to form encoded C1 and C2 codewords, respectively. All of the C1 codewords per data set are endowed with a specific codeword header to form a plurality of partial codeword objects (PCOs). Each PCO is mapped onto a logical data track according to information within the header. On each logical data track, adjacent PCOs are merged to form COs which are modulation encoded and mapped into synchronized COs. Then T synchronized COs are written simultaneously to the data tape where T is the number of concurrent active tracks on the data tape.

摘要翻译： 为了将数据写入多轨磁带，接收到的数据集并被分割成未编码的子数据集，每个子​​集包括具有K2行和K1列的阵列。 对于每个未编码的子数据集，为每行生成N1-K1 C1-奇偶校验字节，并为每列生成N2-K2 C2-奇偶校验字节。 C1和C2奇偶校验字节分别附加到行和列的末端，分别形成编码的C1和C2码字。 每个数据集的所有C1码字都具有特定的码字头以形成多个部分码字对象（PCO）。 每个PCO根据标题内的信息被映射到逻辑数据轨道上。 在每个逻辑数据轨道上，相邻的PCO被合并以形成被调制编码并被映射到同步的CO中的CO。 然后将T同步的CO同时写入数据磁带，其中T是数据磁带上的并发活动磁道的数量。