Re: [Openocd-development] Incorrect chain detection for SoC...

[Ø. H. <oyv...@zy...>]

> " Because there is no way to read the signal exactly at the rising edge, read
>  after the rising edge."
>
> Sounds strange to me. If you want to read the value of a signal changing
> with a rising clock edge, the only reliable way is to read it *before* the
> edge.

A bitbang/software driver really can't address the finer points of
clocked signals, you'll
need hw to do that.

I'm not a hw guy, but I know that the whole jtag clocked signal
business is more subtle
than one might think and especially with arm11 & many devices in the
chain I've seen
quirky behaviour that can be hard for sw/bitbang implementations to
deal with fully.




-- 
Øyvind Harboe
http://www.zylin.com/zy1000.html
ARM7 ARM9 XScale Cortex
JTAG debugger and flash programmer