I added some pictures of the board swamped with logic probe clips (22
clips) as I debugged the bus timing.
http://www.delorie.com/pcb/m3a/
Turns out the CP2200 is too slow to run the m32c at full speed (30
MHz); the m32c can only add 3 wait states (115nS vs 140nS needed).
The RAM is too slow for
John Luciani wrote:
On 11/2/06, DJ Delorie <[EMAIL PROTECTED]> wrote:
I've got blinky lights!
Congratulations.
Nothing like the immense satisfaction of the blinky light. Difficult
to explain to
others the amount of joy a single flashing LED brings ;-)
Except for those who have experienc
> "Testing RAM in Embedded Systems"
Yeah, I know about that one. Back when I designed PC motherboards,
our group wrote our own diagnostics. Our memory test found bugs that
no other memory test we had access to did. Pseudo-random fills is
sufficient for my purposes, and avoids 90% of the usual
On 11/2/06, DJ Delorie <[EMAIL PROTECTED]> wrote:
I've got blinky lights!
Congratulations.
Nothing like the immense satisfaction of the blinky light. Difficult
to explain to
others the amount of joy a single flashing LED brings ;-)
(* jcl *)
--
http://www.luciani.org
___
On Thursday 02 November 2006 19:06, DJ Delorie wrote:
> So, once the configuration was figured out, all 4Mb of SRAM passed the
> memtest I wrote! It was a simple one, writing out a deterministic
> pseudorandom sequence, then reading it back in and comparing.
"Testing RAM in Embedded Systems"
Add
I got the replacement LDO today and swapped it in. Carefully checked
the voltages; all OK and no magic smoke this time.
The only fix I've had to make so far is that I didn't tie the HOLD and
RDY lines at all, and the m3a board has them tied in an inconvenient
way. Yup, locked up the chip. One
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