Boots – shoes – and leggings
Patent
1982-02-22
1985-05-21
Shaw, Gareth D.
Boots, shoes, and leggings
G06F 900, G06F 1300
Patent
active
045190313
ABSTRACT:
A system for real-time digital signal processing employs a single-chip microcomputer device having separate on-chip program ROM and data RAM, with separate address and data paths for program and data; however, the accumulator in the data path may be used as a program address source for table look-up, for example. An external program address bus allows off-chip program fetch 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, such as accumulator addressing. 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, with 32-bit output to the ALU. One input to the ALU passes through a 0-to-15 bit shifter with sign extension. The contents of the accumulator may be forced to a maximum or minimum value upon overflow or underflow to simulate saturation in analog systems; this function may be enabled or disabled under instruction control.
REFERENCES:
patent: 4086626 (1978-04-01), Chung
patent: 4199811 (1980-04-01), Borgerson et al.
patent: 4293907 (1981-10-01), Huang
patent: 4371931 (1983-02-01), Catiller et al.
Gass Wanda K.
Magar Surendar
Graham John G.
Mills John G.
Shaw Gareth D.
Texas Instruments Incorporated
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