I think a PCI device can communicate with another PCI device directly without the intervention of the CPU.
Excerpt from "PCI Express System Architecture" ... PCI Transaction Model - Peer-to-Peer A Peer-to-peer transaction shown as Transaction 3 in Figure 1-5 on page 20 is the direct transfer of data between two PCI devices. A master that wishes to initiate a transaction, arbitrates, wins ownership of the bus and starts a transaction. A target PCI device that recognizes the address claims the bus cycle. For a write bus cycle, data is moved from master to target. For a read bus cycle, data is moved from target to master. .... --S On Wed, Oct 15, 2008 at 9:35 PM, Eduardo Morras <[EMAIL PROTECTED]> wrote: > At 20:32 14/10/2008, you wrote: >> >> Hello, >> >> I have a small doubt. >> >> Suppose I have a PCI card with a general purpose CPU on it. Could it be >> able >> to communicate with another PCI device or ISA device(lets say IDE hard >> disk)? > > You can't do it directly. You must pass through the OS driver that controls > your card. You pass to your driver the data and it send data to other > driver, hard disk, etc.. Note that in some OSs your driver can't pass that > info from one driver to another and need an app that binds your driver with > the other driver. > > >> Thanks, >> Srinivas >> _______________________________________________ >> freebsd-hackers@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> To unsubscribe, send any mail to "[EMAIL PROTECTED]" > > _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
