USB pics 16c745/765
Andrew Warren email (remove spam text)
Scott Dattalo <MITVMA.MIT.EDU> wrote: PICLIST
> Has anyone used these [USB PICs]?
I think Microchip has to actually SHIP one before anyone can use
> Are they price competive?
The pricing info that I have (which I received AFTER I resigned
from the Microchip Consultant Program, so I have no reason to
believe that it isn't public knowledge) indicates that the USB
PICs are priced about five times higher than the Cypress M8-based
USB microcontrollers which currently own over 50% of the
low-speed USB market.
> I don't need the 480Mb/sec bandwidth in USB 2.0
Good, because only one semiconductor company has demonstrated
working USB 2.0 microcontrollers, and USB 2.0 support won't be
in any Windows operating systems until sometime in 2001, and USB
2.0 PC motherboards won't be commonly available for a year or
> in fact the pic devices apparently only support the low speed of
> USB 1.1.
You have to be careful when discussing USB speeds; "low speed"
has a very specific meaning.
There have been three released USB specifications:
USB 1.0 -- defined a 1.5 Mbit/sec interface ("low speed")
USB 1.1 -- added a 12 Mbit/sec interface ("full speed")
USB 2.0 -- added a 480 Mbit/sec interface ("high speed")
Since each spec is a superset of the earlier ones, it's perfectly
accurate -- although misleading -- to say that a 1.5-Mbit/sec
device is "USB 2.0 compliant" or "USB 1.1 compliant".
Usually, though, "1.0" is verbal shorthand for "1.5 Mbits/sec",
"1.1" for "12 Mbits/sec", and "2.0" for "480 Mbits/sec".
If you REALLY want to avoid confusion, it's best to refer to the
three versions as "low, full, and high speed", or -- even better
-- as "1.5, 12, and 480 Mbits/second".
Microchip's USB PICs are limited to the low-speed (1.5 MBit/sec)
=== Andrew Warren --- cypress.comaiw
=== Cypress Semiconductor Corporation
=== Interface Products Division, S.D.
=== The opinions expressed above do
=== not necessarily represent those of
=== Cypress Semiconductor Corporation.
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