I/O interface system using plural buffers sized smaller than non

Details I/O interface system using plural buffers sized smaller than non I/O interface system using plural buffers sized smaller than non

1986-05-19

1989-04-11

Zache, Raulfe B.

Boots, shoes, and leggings

3642383, G06F 300

Patent

active

048211850

ABSTRACT:
An I/O interface (24) couples a plurality of I/O devices (29) to a main memory (22) by way of a system bus (23). The I/O interface includes a plurality of buffer blocks (110) permanently associated with one or more memory pages (240). Each page is contiguous within the memory address spectrum and includes a plurality of memory blocks (230). Under control of a sequencer (125), the buffer blocks temporarily store data items being transferred between the memory and the devices. Data items being transferred between any and all devices and a particular memory page are temporarily stored by that page's associated buffer block and no other buffer block. The sequencer accumulates in a buffer block a plurality of data items being transferred by a device to memory by successive write requests, and causes a direct memory access (DMA) conveyance of the buffer contents to the memory upon occurrence of any one of a number of events. In response to a device read request, the sequencer prefetches by DMA access from the memory into a buffer a block of data items that includes the requested data item. Until occurrence of any one of a number of events, the sequencer satisfies successive read requests made by that same device from the buffer contents.

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