Method and apparatus for configuring a semiconductor device for

Details Method and apparatus for configuring a semiconductor device for Method and apparatus for configuring a semiconductor device for

1998-04-30

2000-07-11

Tokar, Michael

Electronic digital logic circuitry

Interface

Logic level shifting

326 37, 326 62, H03K 190175

Patent

active

060878517

ABSTRACT:
A semiconductor device can be configured for compatibility with different system level interfaces, e.g., LVTTL or SSTL, after assembly, thereby eliminating the need for bonding options and reducing the cost of manufacturing the device. The device includes an interface dependent circuit that operates with a selected interface in response to one or more interface enable signals. Several alternative embodiments include interface control circuits and mode register circuits for generating the interface enable signals responsive to a row address and control signals such as RAS, CAS, WE, and CS. Some embodiments also include a switching network that allows an input buffer to use an internally generated reference voltage for one interface and an externally applied reference voltage for a second interface.

REFERENCES:
patent: 5530379 (1996-06-01), Konishi et al.
patent: 5804985 (1998-09-01), Shieh et al.

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