17 Jun
2013
17 Jun
'13
2:03 p.m.
On 06/17/2013 11:41 AM, Tony Duell wrote:
You can implementasync serial or IEEE388 in <20 MSI
chips. I would love
to see you do any form of USB that way. And when things don't work, it's
a lot harder to make sense of the signals on a USB cable than those on an
RS232 or IEEE488 cable.
What, if anything does MSI mean any more? I can remember a time when
the 74181 was considered to be LSI.
And what does IEEE 388 have to do with this discussion? According to my
publication catalog, it's "Standard for Transformers and Inductors in
Electronic Power Conversion Equipment "
I suppose one could also argue that the same task could be accomplished
with a bucket of 2N2222s as well. What's the point?
A functional USB interface can be done in an 8 pin microcontroller that
probably costs an order of magnitude less than the sockets used in your
20 MSI package implementation.
232C and USB are both bit serial, but USB has higher speeds, friendly
voltage levels, power from a host included and well-defined protocol.
--Chuck