3 Nov
2013
3 Nov
'13
4:29 p.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of Chuck Guzis
Sent: 03 November 2013 23:14
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Looking for a MicroController Recommedation
On 11/03/2013 02:12 PM, Robert Jarratt wrote:
an
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 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
I am going to have re-learn all that stuff I learned 30 years ago all over
again. I had completely forgotten about edge-triggered flip flops.
Thanks
Rob