公开(公告)号：US4672613A

公开(公告)日：1987-06-09

申请号：US794070

申请日：1985-11-01

申请人： Neal E. Foxworthy ,  William S. Clark, Jr. ,  Stephen R. Schossow ,  Robert J. Gabbay

发明人： Neal E. Foxworthy ,  William S. Clark, Jr. ,  Stephen R. Schossow ,  Robert J. Gabbay

IPC分类号： G06F13/00 ,  G06F3/06 ,  G06F11/10 ,  G06F13/12 ,  G06F13/28

CPC分类号： G06F3/0601 ,  G06F11/10 ,  G06F13/28 ,  G06F2003/0691

摘要： In a system for transferring data between a host device and a target recording medium, a buffer interface control unit includes a host direct memory access (DMA) unit for transferring data from the host unit to a buffer memory. The host DMA unit accesses a first set of prescribed noncontinuous buffer memory storage locations to store the data transferred from the host unit in a predetermined buffer format that includes additional sets of prescribed storage locations interspersed with the first set of data storage locations for the storage of error code characters pertaining to the data. The host DMA unit also transfers error correction code characters pertaining to the data to one of the additional sets of prescribed storage locations. The buffer interface control unit further includes a target DMA unit for transferring data from the buffer memory to a write interface unit. The target DMA unit accesses the buffer memory storage locations in a predetermined noncontinuous sequence in order to retrieve the data from the buffer memory in a format that includes open time slots interspersed with time slots occupied by the retrieved data for the insertion of error detection code characters pertaining to the data retrieved from the buffer memory.

摘要翻译： 在用于在主机设备和目标记录介质之间传送数据的系统中，缓冲器接口控制单元包括用于将数据从主机单元传送到缓冲存储器的主机直接存储器访问（DMA）单元。 主机DMA单元访问第一组规定的非连续缓冲存储器存储位置，以以预定的缓冲器格式存储从主机单元传送的数据，该预定缓冲器格式包括与第一组数据存储位置分开的额外的规定存储位置集合，用于存储 与数据有关的错误代码字符。 主机DMA单元还将与数据相关的纠错码字符传送到附加的一组规定的存储位置中的一个。 缓冲器接口控制单元还包括用于将数据从缓冲存储器传送到写入接口单元的目标DMA单元。 目标DMA单元以预定的非连续序列访问缓冲存储器存储位置，以便以包括用于插入错误检测码字符的检索数据所占用的时隙散布的开放时隙的格式从缓冲存储器检索数据 属于从缓冲存储器检索的数据。

公开(公告)号：US4146910A

公开(公告)日：1979-03-27

申请号：US789528

申请日：1977-04-21

申请人： Theodore A. Oliver ,  Neal E. Foxworthy

发明人： Theodore A. Oliver ,  Neal E. Foxworthy

IPC分类号： G11B17/00 ,  G11B27/10 ,  H02P23/00 ,  G11B15/54 ,  G05B19/28 ,  G11B15/18

CPC分类号： G11B17/005 ,  G11B27/10 ,  H02P23/186

摘要： The specification discloses a method and apparatus for providing speed control and rotational indexing of a disc recorder, based upon a particular use of a plurality of electrical pulses produced, for example, as the slots of a slotted wheel, axially coupled to a recording disc, pass a transducer. The primary repetition rate of pulses in response to equally-spaced slots is used for speed control of the recording disc. A secondary pulse rate occurring between two successive pulses resulting from adjacent slots with different spacing is used to establish an index pulse correlated with a reference point on the disc.