System including ATA sequencer microprocessor which executes seq

Details System including ATA sequencer microprocessor which executes seq System including ATA sequencer microprocessor which executes seq

1996-04-22

1997-12-23

Lee, Thomas C.

395856, 39520003, 395445, 395580, G06F 944, G06F 1312

Patent

active

057014507

ABSTRACT:
A modular ATA hard disc controller includes a small on-chip ATA sequencer microprocessor having on-chip dedicated hardware to manage real-time events without host CPU intervention, without substantially degrading cost/performance for the resultant controller chip. To conserve IC chip space, a small instruction set for the on-chip ATA sequencer microprocessor is provided, wherein branch instructions are avoided. The instruction set causes execution only for a given data transfer direction (read or write), or executes always. On-chip task registers are coupled directly to the ATA sequencer microprocessor. This architecture minimizes host CPU bottlenecking by decoupling the host CPU from real-time events occurring on the AT bus, and by decoupling the local processor from the task registers. The resultant controller automatically receipts for all write data, handles task file updating and intersector handshaking, and host microprocessor queueing of the address of the next disc data block to be transferred.

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Data Sheet, Cirrus Logic, "CL-SH 260, Integrated PC XT-AT.TM. Disk Controller", May, 1989, pp. 1-84.
"AIC-6160A, Integrated PC AT Mass Storage Controller, Advance Copy", Adaptec.

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