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Message
From: Mark McDougall<markm@v...>
Date: Fri Oct 26 01:38:46 CEST 2007
Subject: [pci] Rookie questions about PCI
G.Franco wrote:> What I want to accomplish is to build a device which can sample data at
> a very high rate say 1GSa/s, buffer it to ram (if necessary) and convey
> it to my computer for analysis via the PCI bus.
Just be aware that absolute maximum 32-bit PCI33 rate is around 120MB/s,
and more likely 80-100MB/s sustained rate with nothing else on the bus.
> Ok finally my questions. I have been reading up about PCI and from an
> application perspective what exactly is the difference between a PCI
> target, PCI master and PCI bridge? For example since I will be putting
> the PCI card into my computer I will need a PCI target am I correct? I
> am assuming that my PC will be a master and you cannot have two masters
> or can you? Secondly with regard accessing the PCI card from
> application software on the PC side do I need to write special PCI
> drivers or do I use generic drivers that are availible on a windows xp
> machine?
A PCI Master can initiate PCI transactions. eg. PCI mobo, or bus-mastering
card like DMA.
A PCI target can only respond to Master transactions. eg. data acquisition
card without DMA.
A PCI Bridge connects a PCI bus to another PCI or non-PCI bus. Technically
the opencores PCI bridge is exactly that - it bridges the PCI bus and the
Wishbone bus.
You'll need to implement a target at least - or master if you want a DMA
engine on your card. The opencores PCI bridge is suitable for both purposes.
There can be many PCI masters on a bus - one arbiter which is responsible
for granting access to masters that request the bus. Generally the arbiter
is on a PC mobo.
As for drivers, depends on how you implement your device. It is possible
to use generic drivers (like TVICPCI) that allow you to map device
resources into (Windows) user-space. I'm sure there's similar under linux,
though writing a kernel driver module is a lot easier than windows.
> am also
> trying to get hold of a copy of PCI system Architecture by Tom Shanley
> and Don Anderson - 3rd edition but my local bookstore said the
> publisher is out of stock at it will take a few weeks.
Good choice!
Regards,
--
Mark McDougall, Engineer
Virtual Logic Pty Ltd, <http://www.vl.com.au>
21-25 King St, Rockdale, 2216
Ph: +612-9599-3255 Fax: +612-9599-3266
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