Device for reducing the fluctuation of power supply voltage due

Details Device for reducing the fluctuation of power supply voltage due Device for reducing the fluctuation of power supply voltage due

1997-01-06

1999-08-03

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

713300, 174 32, H05K 900

Patent

active

059319275

ABSTRACT:
An output device comprises in-chip data lines of an m-bit (m is an integer of eight or more) configuration for transferring m-bit data containing 1 bits and/or 0 bits, m in-chip output circuits for respectively outputting m bits on the in-chip data lines to m external output pins, decision means, provided for each of n (n is an integer of two or more) groups into which the in-chip data lines and the in-chip output circuits are divided, for deciding whether all bits on each of the n groups of data lines are to be inverted or not on the basis of m-bit data, data inversion circuits provided between the in-chip data lines and the in-chip output circuits in each of at least (n-1) groups and responsive to an output of the decision means for inverting all bits in data on the corresponding in-chip data lines, and inversion information output circuits for outputting to external output pins information indicating whether data in the (n-1) groups have been inverted or not.

REFERENCES:
patent: 4470112 (1984-09-01), Dimmick
patent: 5200979 (1993-04-01), Harris
patent: 5655957 (1997-08-01), Marlow et al.
Mircea R. Stan, et al. "Bus-Invert Coding for Low-Power I/O", IEEE Transactions On Very Large Scale Integration (VLSI) Systems, vol. 3, No. 1, Mar. 1995.
"Delta-I Simultaneous Switching" IBM TDB, pp. 2084-2053, Sep. 1984.
"Non-Volatile Pass Transistor Logic" IBM TDB, pp. 5918-5919, Mar. 1985.
"Coding for Delta I Reduction" IBM TDB, pp. 215-218, Apr. 1988.
"Logical Technique for Reducing Delta-I Noise Caused by Simultaneous Switching of Off C-Chip Drivers" IBM TDB, pp. 149-150, Feb. 1991.

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