公开(公告)号：US5410546A

公开(公告)日：1995-04-25

申请号：US146531

申请日：1993-11-01

申请人： Keith G. Boyer ,  Kenneth R. Burns ,  Thomas H. Gohl ,  Terry R. Gottehrer ,  Bernie R. Marasco ,  Michael R. Stephens ,  Robert D. Thompson

发明人： Keith G. Boyer ,  Kenneth R. Burns ,  Thomas H. Gohl ,  Terry R. Gottehrer ,  Bernie R. Marasco ,  Michael R. Stephens ,  Robert D. Thompson

IPC分类号： G06F11/10 ,  H03M13/09

CPC分类号： H03M13/091 ,  G06F11/10 ,  G06F11/1004

摘要： The present invention discloses a method and apparatus for computing CRC codes for fixed length page buffers of user data where the user data arrives from a transmission device in variable length packets with the packet contents being out of sequential order. The received data is written to a storage device after being restored to the correct sequential order. The data packets are comprised of a header portion and a data portion. The transmission and compression methods commonly employed by the transmission device dictates that the header portion of each packet follows the data portion. The present invention computes a complete CRC code for the data stored in a page buffer in real time as the packets are received by using several registers for saving intermediate CRC codes and circuitry to combine partial CRC codes for those packet portions received out of order. Additional circuitry is provided which reorders the data packet portions received out of order back into sequential order as the data is stored in a page buffer memory in real time. Computing the CRC codes in real time permits the saving of costs associated with other approaches that significantly buffer the incoming packets to permit subsequent reordering and CRC computation. The present invention assures data integrity of data from the time it is received from the compression unit until the time it is sent to the storage device. In addition, the present inventions ability to compute the CRC codes real time maintains optimal performance of data throughput of the storage subsystem. The present invention alleviates problems relating to delaying new data packet transmissions as deferred CRC computations are performed on previous packets reordered in temporary buffer memory.

摘要翻译： 本发明公开了一种用于计算用户数据的固定长度页缓冲器的CRC码的方法和装置，其中用户数据以可变长度分组从传输设备到达，分组内容不顺序。 接收到的数据在恢复到正确的顺序后被写入存储设备。 数据分组由报头部分和数据部分组成。 通常由传输设备使用的传输和压缩方法指示每个分组的报头部分遵循数据部分。 本发明通过使用多个用于保存中间CRC码的寄存器和电路来组合部分接收到的CRC码，从而实时地计算存储在页缓冲器中的数据的完整CRC码。 提供了附加电路，其中随着数据被实时地存储在页面缓冲存储器中，将按顺序接收的数据分组部分重​​新排列成顺序的顺序。 实时计算CRC码可以节省与其他方法相关的成本，这些方法可以显着缓冲输入数据包，从而允许后续的重新排序和CRC计算。 本发明确保从从压缩单元接收的时间到其被发送到存储设备的时间之前的数据的数据完整性。 此外，本发明实时计算CRC码的能力保持了存储子系统的数据吞吐量的最佳性能。 本发明缓和了延迟新数据分组传输的问题，因为对临时缓冲存储器中重新排序的先前分组执行延迟CRC计算。

公开(公告)号：US5369532A

公开(公告)日：1994-11-29

申请号：US896106

申请日：1992-06-09

申请人： William C. Dodt ,  Jerry L. Donze ,  Terry R. Gottehrer ,  Ronald W. Korngiebel ,  Donald F. McCarthy

发明人： William C. Dodt ,  Jerry L. Donze ,  Terry R. Gottehrer ,  Ronald W. Korngiebel ,  Donald F. McCarthy

IPC分类号： G06F3/06 ,  G11B15/04 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/10 ,  G11B27/30 ,  G11B27/32 ,  G11B5/09 ,  G11B19/04

CPC分类号： G06F3/0601 ,  G11B15/04 ,  G11B20/10 ,  G11B20/1209 ,  G11B20/1833 ,  G11B20/1879 ,  G11B27/107 ,  G11B27/3027 ,  G11B27/32 ,  G11B27/322 ,  G11B27/323 ,  G11B27/328 ,  G06F2003/0698 ,  G11B20/1211 ,  G11B2220/90

摘要： Control software and hardware in the tape drive control unit creates and manages a header segment at the beginning of the magnetic tape. This header segment includes an administrative information section that contains data relating to the magnetic tape itself. The administrative information includes read/write status information such as the write protect status of the magnetic tape that enables the tape drive control unit to manage the data records written onto the magnetic tape without reference to any other source of administrative data. In addition, each data record written on the magnetic tape includes a header which denotes the read/write status of the data record.

摘要翻译： 磁带驱动器控制单元中的控制软件和硬件在磁带开头创建并管理标题段。 该标题段包括管理信息部分，该部分包含与磁带本身有关的数据。 管理信息包括读/写状态信息，例如磁带的写保护状态，使得磁带驱动器控制单元能够管理写在磁带上的数据记录，而不参考任何其他管理数据源。 此外，写在磁带上的每个数据记录包括表示数据记录的读/写状态的标题。

公开(公告)号：US5325370A

公开(公告)日：1994-06-28

申请号：US791791

申请日：1991-11-12

申请人： Brian G. Cleveland ,  William C. Dodt ,  Terry R. Gottehrer ,  Donald F. McCarthy ,  Charles A. Milligan

发明人： Brian G. Cleveland ,  William C. Dodt ,  Terry R. Gottehrer ,  Donald F. McCarthy ,  Charles A. Milligan

IPC分类号： G11B15/00 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/28 ,  G11B27/32 ,  G06F11/10

CPC分类号： G11B20/1883 ,  G11B15/005 ,  G11B20/10 ,  G11B20/1209 ,  G11B20/1833 ,  G11B20/1879 ,  G11B27/28 ,  G11B27/328 ,  G11B20/1211 ,  G11B2220/90

摘要： The control software and hardware in the tape drive control unit creates and manages a header segment at the beginning of the magnetic tape. This header is interposed between a leader portion of the magnetic tape on the 3480-type cartridge and the remainder of the magnetic tape contained therein. This header segment contains two sections, a first of which is a data record directory that is used by the control unit to denote the location of each data record written on to the magnetic tape as well as administrative information associated with the data record. The second section of the header is an administrative information section that contains data relating to the magnetic tape itself. The stream of data records is divided into data segments, a plurality of which comprise a single helical scan track. The helical scan tracks are formed into scan groups and written on the magnetic tape. At least one longitudinal track is written on the magnetic tape coextensive with the helical scan groups to provide data to enable the tape drive to quickly locate data records recorded on the magnetic tape.

摘要翻译： 磁带驱动器控制单元中的控制软件和硬件在磁带开始处创建和管理标题段。 该头部插入在3480型盒式磁带的磁带的引导部分和其中包含的其余磁带之间。 该标题段包含两个部分，第一部分是数据记录目录，由控制单元用于表示写入磁带的每个数据记录的位置以及与数据记录相关联的管理信息。 标题的第二部分是包含与磁带本身相关的数据的管理信息部分。 数据记录流被分成多个数据段，其中多个数据段包括单个螺旋扫描轨道。 螺旋扫描轨迹形成扫描组并写在磁带上。 至少一个纵向磁道被写在与螺旋扫描组共同延伸的磁带上，以提供数据以使磁带机能够快速定位记录在磁带上的数据记录。

公开(公告)号：US5487171A

公开(公告)日：1996-01-23

申请号：US947204

申请日：1992-09-18

申请人： William C. Dodt ,  Terry R. Gottehrer ,  Charles A. Milligan

发明人： William C. Dodt ,  Terry R. Gottehrer ,  Charles A. Milligan

IPC分类号： G06F3/06 ,  G11B5/008 ,  G11B15/02 ,  G11B15/087 ,  G11B15/16 ,  G11B20/10 ,  G11B27/30 ,  G11B27/32 ,  G06F15/02

CPC分类号： G06F3/0601 ,  G11B15/026 ,  G11B15/087 ,  G11B15/16 ,  G11B20/10 ,  G11B27/3027 ,  G11B27/32 ,  G11B27/323 ,  G11B27/328 ,  G11B5/0086 ,  G06F2003/0698 ,  G11B2220/90

摘要： In response to the mounting of a magnetic tape on the tape drive, the tape drive begins reading data from the tape into the preload buffer while concurrently signalling the data processor that the tape drive is instantaneously available to read/write data. The data processor can then begin the data transfer operation without incurring the delay occasion by media set up time. The data that is transferred from magnetic tape is stored in the preload buffer in anticipation of the data processor issuing a data read command. Upon receipt of the data read command, the tape drive reads the data out of the preload buffer to the data processor via the data channel while simultaneously reading data from the magnetic tape into the preload buffer.

摘要翻译： 响应于在磁带驱动器上安装磁带，磁带驱动器开始从磁带读取数据到预加载缓冲器中，同时向数据处理器发信号通知磁带驱动器瞬时可用于读/写数据。 然后，数据处理器可以开始数据传输操作，而不会由媒体设置时间引起延迟。 预期数据处理器发出数据读取命令，将从磁带传送的数据存储在预加载缓冲器中。 在接收到数据读取命令时，磁带驱动器通过数据通道将数据从预加载缓冲器读出到数据处理器，同时将数据从磁带读入预载缓冲器。