Boots – shoes – and leggings
Patent
1985-02-12
1987-12-15
Chan, Eddie P.
Boots, shoes, and leggings
G06F 1300
Patent
active
047137487
ABSTRACT:
A system for real-time digital signal processing employs a single-chip microcomputer device having separate on-chip program and data memory, with separate address and data paths for program and data. An external program address bus allows off-chip program fitch in an expansion mode, with the opcode returned by an external data bus. A bus interchange module allows transfer between the separate internal program and data busses in special circumstances. The internal busses are 16-bit, while the ALU and accumulator are 32-bit. A multiplier circuit produces a single state 16.times.16 multiply function separate from the ALU, 32-bit output to the ALU. One input to the ALU passes through a 0-to-15 bit shifter with sign extension. The on-chip program memory may be a RAM and this additional RAM may be configured as either program or data memory space. The processor may operate with all off-chip program memory and a large on-chip data memory, or with program execution from on-chip RAM (downloaded from off-chip program memory) using a block move instruction. A repeat instruction is used to save program space when using block-move, or multiply instructions as needed for digital filters or the like.
REFERENCES:
patent: 4407016 (1983-09-01), Bayliss et al.
patent: 4413319 (1983-11-01), Schultz et al.
patent: 4433378 (1984-02-01), Leger
patent: 4451884 (1984-05-01), Heath et al.
The 8080/8085 Microprocessor Book, Intel. Marketing Communications, 1980.
Caudel Edward R.
Essig Daniel L.
Magar Surendar S.
Simpson Richard D.
Chan Eddie P.
Graham John G.
Texas Instruments Incorporated
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