10-22-2013
Quote:
Originally Posted by
Lost in Cyberia
hey everyone, just a general question. I did an lspci on my home computer, and it got me thinking... When I hear pci..I think of the physical slots on your motherboard. usually beige in color.. But the list returned to me is of atleast 20 items. None of which, (besides the graphics card) is plugged into a pci slot... Some things like memory controller, 1,4,5, high definition audio, Address map, DRAM controller, and the most bizarre, Serial ATA Controller... So does this mean, that these devices built onto the motherboard are using the same PCI bus that have the two slots on my board? And why is a SATA controller using a PCI bus? And lastly, how many devices can all comfortably live on 1 bus? Or are all these different PCI buses?
Don't get offended at my suggestion, but you might want to invest in a book that describes how computer hardware works. The concept of a data bus is not new, and a book on the subject would give you a better understanding.
The bus does not need to have any physical slots. Laptops use PCI bus, and have no physical PCI slots. The slot is simply to allow expansion, to add new things onto the bus. Also there is PCI which is a parallel bus with shared bandwidth, and there is PCI-E, which is serial with dedicated bandwidth in a star topology. Lastly, yes a machine can have more than one bus. This is most common in servers, which need to support larger I/O workloads than a desktop.
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LEARN ABOUT NETBSD
ieee1394if
IEEE1394IF(4) BSD Kernel Interfaces Manual IEEE1394IF(4)
NAME
ieee1394if -- IEEE1394 High-performance Serial Bus
SYNOPSIS
ieee1394if* at fwohci?
DESCRIPTION
NetBSD provides machine-independent bus support and raw drivers for IEEE1394 interfaces.
The ieee1394if driver consists of two layers: the controller and the bus layer. The controller attaches to a physical bus (like pci(4)).
The ieee1394if bus attaches to the controller. Additional drivers can be attached to the bus.
Up to 63 devices, including the host itself, can be attached to a IEEE1394 bus. The root node is dynamically assigned with a PHY device
function. Also, the other IEEE1394 bus specific parameters, e.g., node ID, cycle master, isochronous resource manager and bus manager, are
dynamically assigned, after bus reset is initiated. On the ieee1394if bus, every device is identified by an EUI 64 address.
FILES
/dev/fw0.0
/dev/fwmem0.0
SEE ALSO
fwip(4), fwohci(4), pci(4), sbp(4), fwctl(8), sysctl(8)
HISTORY
The ieee1394if driver first appeared in FreeBSD 5.0, as firewire. It was added to NetBSD 4.0 under its present name.
AUTHORS
The ieee1394if driver was written by Katsushi Kobayashi and Hidetoshi Shimokawa for the FreeBSD project. It was added to NetBSD 4.0 by
KIYOHARA Takashi.
BUGS
See fwohci(4) for security notes.
BSD
June 18, 2005 BSD