Computer system selecting byte lane for a peripheral device duri

Details Computer system selecting byte lane for a peripheral device duri Computer system selecting byte lane for a peripheral device duri

1993-10-29

1996-10-01

Lee, Thomas C.

Boots, shoes, and leggings

395842, 395846, 395500, 3642423, 36424234, 3649481, G06F 1328

Patent

active

055618197

ABSTRACT:
A direct memory access controller implements a two-cycle approach for performing a desired DMA transfer by executing both a memory access cycle and an I/O access cycle. During the memory access cycle, the address location of system memory to be accessed is driven on the addressing lines of a local bus. During the I/O access cycle, an address value within a DMA configuration address range is driven on the address lines of the local bus. The lower two order bits of the address value are encoded to provide byte lane information to a peripheral device during the I.backslash.O access cycle. The peripheral device responsively receives or provides data at the specified byte lane. As a result, peripheral devices that may be connected to the local bus will not respond to the I/O access cycle, while encoded byte lane information is provided to the desired peripheral device without requiring dedicated byte select lines.

REFERENCES:
patent: 4271466 (1981-06-01), Yamamoto et al.
patent: 4475155 (1984-10-01), Oishi et al.
patent: 4514808 (1985-04-01), Murayama
patent: 4807112 (1989-02-01), Hamasaki
patent: 4815034 (1989-03-01), Mackey
patent: 5187783 (1993-02-01), Mansfield et al.
patent: 5297242 (1995-03-01), Miki
patent: 5404481 (1995-04-01), Miyamori
"Emulation of IBM PC Bus Operations by an 80188 Processor," IBM Technical Disclosure Bulletin, Mar. 1989, IBM Corp, pp. 126-129.
Zilog, "1983/84 Components Data Book", Z8410, Z80 DMA Direct Memory Access Controller (pp. 27-44).

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