Lpc2000

On Sun, May 08, 2005 at 10:50:38AM -0000, Sunil Jha wrote:
>    What should be the polarity and phase for SD memory card?

The clock line idle state is high, data is latched on the second
(rising) edge.

Note that when the card is first accessed, the data output is open
drain and requires a pullup - you must use a slow clock speed - the
spec says 400kHz but I have found that even that is too fast for some
cards - I use 200kHz. After initialization the output is push-pull and
it will run at full speed (25MHz).

Clyde

-- 
Clyde Stubbs                     |            HI-TECH Software
Email: clyde@...          |          Phone            Fax
WWW:   http://www.htsoft.com/    | USA: (408) 490 2885  (408) 490 2885
PGP:   finger clyde@...   | AUS: +61 7 3552 7777 +61 7 3552 7778
---------------------------------------------------------------------------
HI-TECH C: compiling the real world.