Electronic digital logic circuitry – Multifunctional or programmable – Array
Reexamination Certificate
2006-10-31
2006-10-31
Le, Don (Department: 2819)
Electronic digital logic circuitry
Multifunctional or programmable
Array
C326S082000
Reexamination Certificate
active
07129749
ABSTRACT:
A programmable logic device (PLD) having a programmable routing structure that employs non-static memory cells, such as dynamic random access memory (DRAM) cells, to control configurable circuit elements, such as pass-transistors and/or MUXes. In a representative embodiment, each DRAM cell is connected to its corresponding configurable circuit element using a buffer adapted to stabilize the output voltage generated by the cell and offset the effect of charge leakage from the cell capacitor. In addition, refresh circuitry associated with the DRAM cell periodically restores the charge in the cell capacitor using a refresh operation that is performed in the background, without disturbing the user functions of the PLD. Advantageously, a relatively large capacitance associated with a DRAM cell makes a PLD of the invention less susceptible to soft errors than a prior-art PLD that relies on SRAM cells for configuration control of its routing structure.
REFERENCES:
patent: 5206830 (1993-04-01), Isobe et al.
patent: 5317212 (1994-05-01), Wahlstrom
patent: 5375086 (1994-12-01), Wahlstrom
patent: 5594698 (1997-01-01), Freeman
patent: 5617551 (1997-04-01), Corder
patent: 6088260 (2000-07-01), Choi
patent: 6600677 (2003-07-01), Afghahi et al.
patent: 6717863 (2004-04-01), Afghahi et al.
patent: 6778461 (2004-08-01), Grasso
Fenstermaker Larry R.
Lin Mou C.
Schadt John A.
Gruzdkov Yuri
Lattice Semiconductor Corporation
Le Don
Mendelsohn Steve
LandOfFree
Programmable logic device having a configurable DRAM with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Programmable logic device having a configurable DRAM with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable logic device having a configurable DRAM with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3652683