Re: OTP Secure Digital ?

On Jan 31, 10:40 am, "Peter Dickerson"
<firstname.lastn...@xxxxxxxxxxxxxxxx> wrote:


I am looking for SD (Secure Digital) memory that can be programmed only
once. Basically, once programmed, it cannot be erased. I searched the

There is no such thing.

The CSD register of the SD interface contains a write-once bit called
PERM_WRITE_PROTECT that does the follow (quoting)

The OP appears to be making something like those sewing machines or
fitness trainers that use removable media cards to store software
packs (stitch patterns, exercise programs, etc). SD is really not the
right choice for an application like this; even though many such
devices LOOK like SD cards, they almost never are.

The write-protect bit to which you refer can be subverted by various
means.

.

Quantcast