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Improvement of Interrupt Controller Performance by Fake Local Memory Acknowledge Signal

IP.com Disclosure Number: IPCOM000043566D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05

Publishing Venue


Related People

Hung, TC [+details]


To improve performance of an interrupt controller in a disk-based system, the disk adapter process, the disk interrupt service routine and physical format of the disk itself are designed such that the disk interrupt service routine will use as little time as possible. More specifically, a fake local memory acknowledge signal is used in combination with single-sector commands and a two-sector interleave scheme, whereby the lower priority interrupt levels will not be masked off for a long period of time by the disk local memory request interrupts. The disk adapter transfers data to and from the local memory (LM) within a system memory via a direct memory access (DMA) controller. There are two kinds of disk interrupts, i.e., normal command end interrupt and LM request interrupt.