3 Nov
2013
3 Nov
'13
3:13 p.m.
On 11/03/2013 02:12 PM, Robert Jarratt wrote:
So, according to the manual I have, the data rate is
5megabits/sec. But, the
pulse width that you need to detect (and generate) is 50ns, requiring the
signal to be sampled at 25ns intervals, or 40MHz. Someone suggested to me
that even 40MHz may not be enough, but I have not had a reply back when I
asked what a better sampling frequency might be.
No, I don't agree--the pulse that comes from the drive is used as input
to an edge-triggered T-type flip-flop; the pulse width itself is
irrelevant--only the time between pulses.
Edit: I should probably say that a T-edge-triggered FF will get you the
original DC signal applied to the write head. You could also trigger on
the leading edge of each pulse. The point is that the width of the
pulse has no particular significance.
--Chuck