ATAPI state machine controlled by a microcontroller for interfac

Details ATAPI state machine controlled by a microcontroller for interfac ATAPI state machine controlled by a microcontroller for interfac

1998-07-30

2000-08-15

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711111, 711113, 710 62, 709217, G06F 1200

Patent

active

061051071

ABSTRACT:
A digital-versatile disk (DVD) controller interfaces to an AT bus using ATAPI commands delivered in command packets. A microcontroller executes firmware routines to control the servo that positions the read head, and reads data sectors from the DVD disk. The microcontroller also performs error correction on the DVD data in a disk buffer. A host state machine is used to interface to the AT bus. State transitions in the host state machine are enabled or blocked by the microcontroller by setting auto-transition bits in a state-control register. The microcontroller can set auto bits to allow the host state machine to automatically receive multi-byte command packets, or to transfer data or send status to the host without microcontroller intervention. The microcontroller also has the option of performing any of these steps manually, such as for more complex ATAPI commands. Overlapping ATAPI commands are allowed when the AT bus is released. The host state machine can be programmed to wait for a service command from the host after the bus is released, and then automatically transfer data or status. Transfer errors send interrupts to the microcontroller so it can execute recovery routines.

REFERENCES:
patent: 5661848 (1997-08-01), Bonke et al.
patent: 5809245 (1998-09-01), Zenda
patent: 5964708 (1999-08-01), Fang et al.
patent: 6006295 (1999-12-01), Jones et al.

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