On Tue, 22 Feb 2005 09:54:55 -0500
Timothy Miller <[EMAIL PROTECTED]> wrote:
> On the FPGA board, the PCI controller will probably be separate. But
> in the ASIC, we'll simply glue the two units together with a
> minimalist wrapper so as not to disturb the design of either one.
I just had a thought about this again. Wouldn't it be better
to keep the PCI interface in the FPGA and instead use a
JTAG interface ? Then an additional (semi)custom chip could be
saved, the whole board would be debuggable and still easily
programmable. Additionaly, you could use the same PCB
for the ASIC and the FPGA version as they would not
differ in their functionality, which brings the FPGA
board a big step nearer to the price of the ASIC board.
As an interface, either an special JTAG interface card
or some adapter to the parallel port could be used.
Those who'd like to play with these features will
for sure not mind if they have to connect a cable
from outside to the board.
The only thing i'm not sure about is, how the
pins of an FPGA react while programming, ie
whether they could lock up the PCI bus or something.
Attila Kinali
--
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