Computer-aided design and analysis of circuits and semiconductor – Nanotechnology related integrated circuit design
Reexamination Certificate
2005-10-18
2005-10-18
Siek, Vuthe (Department: 2825)
Computer-aided design and analysis of circuits and semiconductor
Nanotechnology related integrated circuit design
C716S030000
Reexamination Certificate
active
06957399
ABSTRACT:
The propagation of a feedback signal, such as a DQS signal generated in response to a read request in a Double Data Rate (DDR) memory system, into a digital host system, such as an ASIC, is controlled by using delay tracking to compensate for variable I/O delay. The memory system includes a controller and an interface, both on the ASIC, and memory units coupled to the controller through the interface, all configured on a printed circuit board (PCB). The interface uses the read request signal, sent by the controller to initiate read operations, to generate a read-enable signal, which is transmitted to a trace on the PCB one-half cycle of the system clock before DQS is expected to reach the interface. The trace tracks the total delay encountered by the system clock and DQS between the interface unit and memory units, and is routed back to the interface unit, where read-enable is used to generate an enable signal that allows DQS to propagate into the ASIC only when DQS is a valid digital signal.
REFERENCES:
patent: 5952843 (1999-09-01), Vinh
patent: 6456544 (2002-09-01), Zumkehr
patent: 6629225 (2003-09-01), Zumkehr
patent: 6646929 (2003-11-01), Moss et al.
patent: 2003/0141893 (2003-07-01), Gonzalez
patent: 2004/0107324 (2004-06-01), Nystuen
Emberling Brian D.
Ramirez Anthony S.
Brightwell Mark K.
Dinh Paul
Hood Jeffrey C.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Siek Vuthe
LandOfFree
Controlling the propagation of a digital signal by means of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Controlling the propagation of a digital signal by means of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controlling the propagation of a digital signal by means of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3473743