On Sat, Oct 06, 2007 at 10:46:44PM -0400, Robinson Tryon wrote:
Question about registers:
In the datasheet for the FDC37M81x, registers 0x62,0x63 of COM2 have values marked for their hard reset (0x00,0x00). In the 'Configuration Register' column, there is a note that these two registers are 'Reserved'.
So, in this type of case should I mark the two registers with their given value, 0x00, or should I use RSVD?
Either is fine, I guess. So far I let RSVD "override" everything else, i.e. as soon as I see a "Reserved" register, I make it RSVD, even if there's a default value in the datasheet.
What if the registers were marked with a dash (-) ? Usually I would mark that as NANA, but if it's marked as reserved I assume I should use RSVD instead.
Yeah.
Oh -- and what about the chip rev? Usually there's no given value (because it would change with each chip), so I would mark it MISC, but I believe I saw that other people had marked the chip rev register as NANA. Which is preferable, and why?
NANA, because there's no default. MISC would also be possible, but I think NANA is more specific. It's a minor issue, though.
Uwe.