Odd boundary address aligned direct memory acess device and meth

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364DIG1, 3642423, 364260, 3642601, 364259, 3642595, G06F 1328

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051704773

ABSTRACT:
A system for transferring a plurality of data items (bytes) between a source device and a destination device. The system loads data items from the source device into a register so as to align the data items with the storage locations of the destination device, transfers the aligned data items to the destination device, rolls-down, in sequence, any remaining data items in the register to least significant storage locations thereof; loads a full data word, which includes a predetermined number N of data items, from the source device into the register starting with the most significant storage location of the register containing a data item; and transfers N or fewer data items stored in the register, starting from the least significant storage location of the register to the destination device.

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patent: 4309754 (1982-01-01), Dinwiddie, Jr.
patent: 4346439 (1982-08-01), Huno et al.
patent: 4471427 (1984-09-01), Harris
patent: 4542457 (1985-09-01), Mortensen et al.
patent: 4545014 (1985-10-01), Oguchi
patent: 5038320 (1991-08-01), Heath et al.
patent: 5067075 (1991-11-01), Sugano et al.
IBM Technical Disclosure Bulletin, Dec. 1984, pp. 4247-4248, vol. 27, No. 7B.

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