Configuration eprom with programmable logic

Details Configuration eprom with programmable logic Configuration eprom with programmable logic

1999-03-23

2001-03-06

Tohar, Michael (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

Having details of setting or programming of interconnections...

C326S038000, C326S039000, C326S040000, C326S041000

Reexamination Certificate

active

06198303

ABSTRACT:

BRIEF DESCRIPTION OF THE INVENTION
This invention relates generally to Erasable Programmable Read-Only Memories (EPROMs) used to configure electronic devices, such as programmable logic devices or Static Random Access Memories (SRAMs). More particularly, this invention relates to a single package electronic device including both a programmable logic device and an EPROM.
BACKGROUND OF THE INVENTION
Erasable Programmable Read-Only Memories (EPROMs) are used to configure electronic devices, such as Static Random Access Memories (SRAMs) and programmable logic devices. In the case of SRAMs, the SRAM must be configured each time the system initializes. Generally, this initialization configuration is achieved by downloading data from an EPROM into the SRAM. Additionally, data may be transferred from the EPROM to the SRAM whenever new configuration data is needed. EPROMs are used in a similar manner when configuring programmable logic devices.
EPROMs are commonly used on a printed circuit board with other control circuits. Frequently, these control circuits operate in connection with programmable logic devices to which the EPROMs download configuration data. Since EPROMs and control circuits sometimes operate together it would be highly desirable to provide an EPROM that could perform both fundamental configuration functions and extended control functions. Such an approach could reduce the number of circuits on a printed circuit board, thereby saving space and otherwise reduce cost.
SUMMARY OF THE INVENTION
An electronic device includes an Erasable Programmable Read-Only Memory (EPROM), a programmable logic device connected to the EPROM, and a single package enclosing the EPROM and the programmable logic device. The electronic device provides combined functionality that allows the EPROM to store configuration data for an external programmable logic device, while the programmable logic device is configured to implement some other function, such as a Joint Test Access Group interface function, an address decoder function, or a state machine.
The device of the invention eliminates the need for discrete devices on a printed circuit board and therefore saves space on the printed circuit board. Further, the combined functional device of the invention is less expensive than the discrete device approach of the prior art. The invention also allows a user to make last minute changes to the configuration schemes without altering the layout of the printed circuit board.


REFERENCES:
patent: 5640107 (1997-06-01), Kruse
patent: 5646544 (1997-07-01), Iadanza
patent: 5760607 (1998-06-01), Leeds et al.
patent: 5768372 (1998-06-01), Sung et al.
patent: 5859544 (1999-01-01), Norman
patent: 5870410 (1999-02-01), Norman et al.
patent: 5923614 (1999-07-01), Erickson et al.
patent: 5999015 (1999-12-01), Cliff et al.
patent: 6028445 (2000-02-01), Lawman
patent: 6031391 (2000-02-01), Couts-Martin et al.

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