Disk controller including format control unit instructing direct

Details Disk controller including format control unit instructing direct Disk controller including format control unit instructing direct

1991-07-30

1993-06-15

Psitos, Aristotelis

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, G11B 700

Patent

active

052205452

ABSTRACT:
A disk controller for a disk having spirally formed tracks comprises a buffer memory for temporarily storing write data to be recorded on said disk and read data derived from said disk. A first register temporarily stores current sector information representative of a sector currently accessible, the current sector information being changed in accordance with rotation of said disk. A second register temporarily stores target sector information representative of a sector from which a data read/write operation starts. A comparator compares the current sector information with said target sector information to produce a comparison output signal taking an active level when the current sector information coincides with the target sector information. A memory control unit produces a ready signal taking an active level when the write data is stored in the buffer memory or when the buffer memory has a vacancy for accepting the read data. A sequence controller is responsive to the comparison output signal and the ready signal to generate a jump back signal when the ready signal is at an inactive level at a time when the comparison output signal takes the active level. The sequence controller further generates, after the comparison signal takes the active level, the jump back signal when the ready signal is at the inactive level at a time when the current sector information changes.

REFERENCES:
patent: 4958314 (1990-09-01), Imai et al.
patent: 4977550 (1990-12-01), Furuya et al.
patent: 5012461 (1991-03-01), Yoshida et al.
patent: 5089999 (1992-02-01), Ishida et al.

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