| 摘要 |
PURPOSE:To attain the access to a RAM without duplication, to eliminate the need for a write priority circuit and to reduce number of components even if jitter takes place in an EFM signal due to an uneven rotation of a disk by providing a delayed flip-flop (D-FF) receiving an AND between an output signal of a flip-flop and a write enable signal. CONSTITUTION:The flip-flop set by a write request signal and the delayed flip-flop receiving an AND between the output signal of the flip-flop and the said write enable signal are provided. Thus, even if the period of generation of a write request signal of a symbol obtained from the EFM signal due to jitter is changed, a write enable signal is generated by a ROM at a period shorter than the generated period. Thus, when the flip-flop is set by the generation of the write request signal, the D-FF is set by the timing of the write enable signal generated before the next write request signal is produced and the write signal is generated.
|
