nedoPC.org

Community of electronics hobbyists established in 2002

...
Atom Feed | View unanswered posts | View active topics It is currently 20 Jun 2018 07:09



Reply to topic  [ 4 posts ] 
[Ternary] xD-Picture MLC memory cards to store ternary data? 
Author Message
Retired

Joined: 03 Aug 2003 23:37
Posts: 1483
Location: Moscow
Reply with quote
According to some sources the xD-Picture (eXtreme Digital) cards of type M+ utilise MLC (multi-level cell) technology that allow to store more than one bit in a single cell. It also known that these cards released without built-in memory controller to reduce final cost. This makes available use of the xD-Picture card as a NAND array of multi-valued memory cells for ternary machines. Researchers have to build their own binary-to-ternary memory controller (since the card has plain binary interface) equipped with fast on-board ternary buffer (to reduce NAND-write limitations, about 10000 write cycles as far as I know) and use it along with the xD-Picture cards.

Link to xD-picture card pinout


26 Jul 2010 03:49
Profile
Admin
User avatar

Joined: 09 Jan 2003 00:22
Posts: 16600
Location: Colorado
Reply with quote
Basically "no memory controller" means no circuit to do wear leveling, but all other things as buffers, address demuxers, command decoder etc are there. It is simply NAND flash chip in plastic with pins collected on one side, so it is binary device, not analog device.

P.S. I was looking at a few patents describing technology to store analog values to NAND cells, but I don't think it's applicable to xD cards...


26 Jul 2010 15:16
Profile WWW
Retired

Joined: 03 Aug 2003 23:37
Posts: 1483
Location: Moscow
Reply with quote
Yes, sure. According to card's pinout there should be some binary logic to address and read-write data in the array. This why I wrote about binary-to-ternary controller.


27 Jul 2010 00:25
Profile
Admin
User avatar

Joined: 09 Jan 2003 00:22
Posts: 16600
Location: Colorado
Reply with quote
Post 
moving up

_________________
:eugeek: https://twitter.com/Shaos1973


10 Nov 2012 09:59
Profile WWW
Display posts from previous:  Sort by  
Reply to topic   [ 4 posts ] 

Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software.