[Gb-ccb] USB interface module

[John Ford]

Martin Shepherd writes:
 > Information about the USB 1.1 interface module that I mentioned at our
 > meeting, can be found at the following URL:
 > 
 >  http://www.gigatechnology.com/usbmodprod.html


You might look at the usbmod4 product, which has the ability to be
programmed to do the xilinx download through its FIFO interface
through an enhancement they call "bit-bang mode".  Very nice!

I should point out that there is a discrepancy in the data sheet.  The
verbiage quotes a rate of "for transferring data to / from a
peripheral and a host PC at up to 8 Million bits (1 Megabyte) per
second.", and then says in a different part of the sheet,
"Send/Receive Data over USB at up to 1 Mb/sec." (note lower-case 'b')

I'll confirm with them that it is suitable for the purpose we intend.

John

 > 
 > Of the two modules shown on this page, the USBMOD2 is the one that I
 > would like to use. The self-contained module shown on the web page is
 > a small PCB, designed to be plugged into a standard 32-pin 600mil IC
 > socket. Presumably it could also be soldered directly onto another
 > PCB. The USB interface chip can also be bought separately, and
 > requires very few additonal components, so we have the option of
 > either buying the fully assembled daughter card shown on the web page,
 > or laying out the circuit ourself on the main PCB.
 > 
 > For initial testing I plan to get one of the fully assembled modules.
 > According to the above web page, one of these costs 50 Australian
 > dollars, and can be delivered internationally, either within 2 weeks,
 > for AU$10, or in 4 days for AU$40. Buying the USB chip separately (the
 > FT8U245AM), costs AU$10 (excluding shipping).
 > 
 > Assuming that whoever lays out the main PCB of the ccb would prefer to
 > mount the chip themselves, the total price for 1 complete module for
 > testing, plus say 3 USB interface chips for the final boards, should
 > be about AU$80, plus up to AU$40 for shipping.
 > 
 > Martin
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