Custom Search
 Join the PC homebuilding revolution! Read the all-new, FREE 200-page online guide: How to Build Your Own PC! NOTE: Using robot software to mass-download the site degrades the server and is prohibited. See here for more. Find The PC Guide helpful? Please consider a donation to The PC Guide Tip Jar. Visa/MC/Paypal accepted.

# Thread: time for refreshing memory

1. Neophyte Geek
Join Date
Nov 2007
Posts
2

## time for refreshing memory

suppose having 256 rows in a microcomputer memory and we need to refresh them. each row must be refreshed at least once every 4 ms (refreshing occurs at periodic basis).what is the time period between successive requests??
i know the max period which is 4 ms, but how should i know the time period if all i am given is the above.????
plus, how can we know for how long a refresh address counter is needed??

2. Lord of Latency, aka "LoL"
Join Date
Mar 2002
Posts
13,062
Blog Entries
2
I would think, given the simplistic nature of the question, it would be a straight shot of 4 ms times 256 rows = 1.024 s.

Your second question seems to be the result of an over-analysis! If that was all the info you were given, you don't need to know any more!

3. Neophyte Geek
Join Date
Nov 2007
Posts
2

## again refreshing memory of a dram

the time period between successive refresh requests is a maximum of 4 ms. isn t there a formula or any inf. that can be retreived given that the memory is a 64K * 1 DRAM ???
the second question would have as an answer 1.024 s as u replied earlier. but this answer would be obtained when refreshing once every 4 ms. which is only a hint, we can have more than 1 refresh in 4 ms.
can't we know the exact result??? thank u

4. Lord of Latency, aka "LoL"
Join Date
Mar 2002
Posts
13,062
Blog Entries
2
What is the nature of these questions?

Yes, there will be a "formula" for determining the exact values needed for any given device. But I was not aware of any specific device being named here. If there is a specific device in question, then what is the part number? The specs for any chip are widely available online. Do you have a DRAM chip for which you are trying to program in a micro-controller setting?

#### Thread Information

##### Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•