Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1998-01-30
2000-03-07
Santamauro, Jon
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 56, 326 82, H03K 19177
Patent
active
060345454
ABSTRACT:
The present invention provides a macrocell for a data processing circuit, comprising macrocell logic, and an interface for connecting the macrocell logic to a bus of the data processing circuit. The interface comprises: an input bus connected to an input bus terminal, an output bus connected to an output bus terminal, and a buffering circuit for buffering the output bus from the macrocell logic. Further, the interface has a mode input terminal for receiving a mode value, the mode value being arranged to control the buffering circuit. The buffering circuit is responsive to a first mode value to enter an inactive state when no data is being output from the macrocell, and is responsive to a second mode value to permanently drive the output bus. Hence, to enable the macrocell to be coupled to a unidirectional bus on the data processing circuit, the second mode value is supplied to the mode input terminal, whilst to enable the macrocell to be coupled to a bidirectional bus on the data processing circuit, the input bus terminal and output bus terminal are connected together externally to the macrocell, and the first mode value is supplied to the mode input terminal.
REFERENCES:
patent: 5585742 (1996-12-01), Kamiya
patent: 5686844 (1997-11-01), Hull et al.
patent: 5705938 (1998-01-01), Kean
patent: 5850151 (1998-12-01), Cliff et al.
patent: 5880595 (1999-03-01), Whetsel
patent: 5894565 (1999-04-01), Furtek et al.
ARM Limited
Le Don Phu
Santamauro Jon
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