Boots – shoes – and leggings
Patent
1990-07-05
1993-09-28
Dixon, Joseph L.
Boots, shoes, and leggings
395400, 3642543, 3642558, G06F 1200
Patent
active
052492800
ABSTRACT:
A memory expansion scheme is provided which permits a program to automatically cross memory bank boundaries, without user intervention. A memory bank address register stores a value corresponding to a selected memory bank (i.e. Bank 0), in a 4-bit subfield (K-Field). In the preferred embodiment, the K-Field is implemented using six (6) bank number registers, each of which is coupled to the corresponding address register, to form a 20-bit (extended) logical address. During an effective address calculation, in the index addressing mode, a 16-bit logical offset address, stored in an offset register, is added to the 20-bit (extended) logical address, by an adder in the ALU. The adder transfers a 20-bit physical address onto an address bus, via an address buffer. When the calculated address crosses a memory bank boundary, the upper four (4) address bits (A.sub.16 -A.sub.19) are automatically updated, thereby enabling the program to cross a memory bank boundary without user intervention. Furthermore, in selected cases, the contents of the bank number register (address bits A.sub.16 -A.sub.19) are automatically updated. Thus, the memory bank expansion scheme provides the capability to automatically cross memory bank boundaries, while automatically updating the information stored in the bank number register.
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Catherwood Michael I.
Livingston Kirk
Nash James C.
Asta Frank J.
Dixon Joseph L.
Motorola Inc.
Whitaker Charlotte B.
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