On 3/27/07, Koen De Vleeschauwer <[EMAIL PROTECTED]> wrote:
On Tue, Mar 27, 2007 at 08:54:40AM -0400, Timothy Normand Miller wrote:
>
> What we have is an array of holes in the board, spaced appropriately
> for a particular connector to be attached. We can attach that
> connector, but the connector is somewhat expensive. We're pondering
> the idea of offering boards without the connector. Instead, there are
> push-pins available that will fit into the holes that may be
> appropriate for many kinds of projects.
>
OK. Yes, I can imagine this connector increases cost somewhat, and it may make
sense to leave it off in most cases.
But getting OGD1 with the connector is then merely an question of ticking off
the appropriate box on an an order form, and paying the corresponding markup?
Possibly. But keep in mind that adding options adds more cost than
the options themselves. That is, if X is the price of the board where
they all have the connector and Y is the cost of the board with the
connector where the base model lacks the connector, then Y will be
greater than X by an amount of money that you may not appreciate.
> The connector we selected has two rows of 50 pins, and the spacing is
> the same as a PATA IDE connector. I don't recall how many pins are
> ground.
I think we're talking about the same connector.
But if you wish to offer this connector as a part of a product, you need to
specify a part number or a datasheet which says where pin A1 to A50 and pin B1
to B50 from the schematic go, and what the mechanical interface is.
Otherwise you are not selling a connector but holes in a board.
It's as if you are offering a software library wihout header files.
We certainly have some clean-up to do on our documentation. However,
all of this will be provided in detail. For instance, part of the
OGD1 product is the "pad ring" which is the top-level Verilog module
that represents all of the pins on the FPGA. That module will contain
instantiation of I/O buffers, clock managers, etc. The next level
down will be basically the same set of pins, but grouped into busses
with descriptive names. From that alone, the pin assignments will be
obvious, but we will provide human-language documentation as well.
--
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project
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