| 摘要 |
PURPOSE:To realize the effecive use of a data part, by selecting the output of a circuit which produces the read/write signals for the 1st and 2nd formats by means of the highest order bit of a track address and accordingly realizing the read or write in different formats with ever track. CONSTITUTION:Read/write gate signal generating circuits 1 and 3 plus decoder circuits 2 and 4 are provided to formatsIand II respectively. Then read/write signals 15 and 17 corresponding to each sector are produced from the circuits 1 and 3 by the internal clock of an external storage device. At the same time, the circuits 2 and 4 deliver decoder 4-bit and 8-bit outputs 16 and 18 by an address that designates a data sector given from outside. The coincidence is detected through coincidence detecting circuits 5 and 6 between the decoder outputs 16/18 and the signals 15/17 respectively. Then format selection signals 19 and 21 are applied to a logical circuit which uses a format selection signal 20 as an input. Thus a read/write signal 22 produced by the formats different with each track is delivered. |
