Automatic READ latency calculation without software...

Details Automatic READ latency calculation without software... Automatic READ latency calculation without software...

2005-05-24

2005-05-24

Bataille, Pierre (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C365S233100

Reexamination Certificate

active

06898682

ABSTRACT:
In response to a clock cycle and a pending READ command for data with a variably recurring access latency, a clock cycle count is adjusted. If a latency value has not been locked and if the READ command is a first READ command, the clock cycle count is stored as a locked latency value upon receiving a synchronized data available event (DQS for instance). Each subsequent READ command has an associated clock cycle count to enable pipelining wherein the clock cycle count for each READ starts incrementing when the individual READ command is issued. For subsequent READ commands, if the cycle count compares favorably with the locked latency value, data can be sampled safely from the interface at the identical latency for every READ request issued. The locked latency value can be read and/or written by software/hardware such that the read latency is consistent across multiple devices for reproducibility during debug.

REFERENCES:
patent: 5295141 (1994-03-01), Person
patent: 5426756 (1995-06-01), Shyi et al.
patent: 5546404 (1996-08-01), Takahashi et al.
patent: 5708622 (1998-01-01), Ohtani et al.
patent: 5819057 (1998-10-01), Witt et al.
patent: 5835448 (1998-11-01), Ohtani et al.
patent: 6704382 (2004-03-01), Metzler et al.
patent: 20030126356 (2003-07-01), Gustavson et al.
patent: 20040062137 (2004-04-01), Phan et al.
patent: 2000276877 (2000-10-01), None
Draft/Advance, SLDRAM Inc., SLD4M18DR400/4 Meg×18 SLDRAM Pipelined, Eight Bank, 2.5V Operation, 400 Mb/s/pin SLDRAM, Rev. Feb. 12, 1998.

Affiliated with

Also associated with

Rating

Automatic READ latency calculation without software... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic READ latency calculation without software..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic READ latency calculation without software... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3429840