Interpreting Configuration Table Entry tuples

David Hinds dhinds at
Wed Oct 12 12:16:34 EDT 2005

On Wed, Oct 12, 2005 at 01:47:32PM +0200, llandre wrote:
> Hi all,
> I need some help to interpret Configuration Table Entry tuples. I hope 
> this is not a FAQ ...
> I have a SanDisk ConnectPlus WiFi Card with 128 MB memory. I read the 
> CIS with dump_cis (see the dump below). As you can see there are several 
> Configuration Table Entry tuples (0x1b). I need to understand exactly 
> how the card must be powered but some tuples say Vcc=5V, other ones say 
> Vcc=3.3V. Which is the right one?

Either.  It is up to the system to choose.  This is a dual voltage

The [default] entries specify defaults that are inherited by later
entries unless overridden.  Here, the 5V entries are complete
(specifying irq, io settings), and marked "default", so that the 3.3V
entries that follow only need to specify the power information that is
changed, everything else is the same.

-- Dave

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