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Questions tagged [bus]

56 questions
18
votes
3 answers

Finding hardware information on linux without lspci

I have an ARM device running ArchLinux. The device doesn't appear to have any PCI bus, even though it has USB. [root@alarm ~]# lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation…
tudor -Reinstate Monica-
  • 848
14
votes
3 answers

How do device driver instructions program the GPU?

Say I am using a computer, any typical modern computer more or less. A device driver is responsible for everything I see on my screen, including right as I type this the screen is updated(this is, of course, within the scope of an OS, like…
user268540
11
votes
3 answers

What's the difference between a hardware register and a memory-mapped register?

This has been puzzling, so I'll lay it all out here. Apparently, through MMIO, you can access external devices using a certain memory-mapped address, which would then be re-routed to that device itself(through a write, command packet, etc.).…
user285920
10
votes
4 answers

Trying to understand a picture of computer buses

In this picture from http://en.kioskea.net/contents/pc/bus.php3 that explains the buses in a computer I wonder whether the black line from CPU to South Bridge is also a bus? It is not named in the picture, and what is its name? Are those short…
Tim
  • 17,743
9
votes
1 answer

How is the device determined in PCI enumeration? (bus/device/function)

I am confused about PCI Bus/Device/Function enumeration. Looking at the Wikipedia page for PCI configuration, I see that for a given bus, the master will request vendor ID and device ID for all devices using function 0. If all 0xFFs are returned,…
simple_symbols
  • 143
8
votes
1 answer

Is the Front Side Bus part of the CPU or the Motherboard?

Something I'm working on wants a very fast/wide Front Side Bus (FSB). What component is the FSB part of? Is it part of the CPU or the motherboard? Is it something that can be placed on a board, or is it fundamentally a part of the motherboard and…
GreySage
  • 190
7
votes
2 answers

How to read SD card CID on Windows 10

Is there is a tool/way that one can read the CID of a SD card under Windows 10? My laptop card reader seem to be plugged to USB bus rather than PCI bus if this matters.
checho
  • 278
6
votes
2 answers

When I connect 4 USB drives to my PC at the same time, does each slot have 480 Mbit/s?

When I connect 4 USB drives to the 4 available slots on a PC at the same time, does each slot have theoretical 480 Mbit/s or will it be quartered and every port will only have 120 Mbit/s? Does this change when you put 4 USB drives in a Marvell SoC,…
JohnnyFromBF
  • 5,068
5
votes
1 answer

How to emulate a virtual USB drive in Windows?

I have a remote server where I should test work of some application with USB drive. Unfortunately, there is no ability to install any USB drive there. So, I need to emulate a virtual USB drive in Windows. Application checks the disks that are on USB…
Ihor Holoviy
  • 51
5
votes
1 answer

What does PCI (not PCI-E) bus speed of 66MHz really mean?

According to this article , the bus is the circuit that connects the motherboard . The faster the speed of the bus , the quicker data can be transferred . Bus speed is measured in MHz (Mega Hertz) and a bus speed of 66 MHZ means that that are 66…
Computernerd
  • 1,017
4
votes
2 answers

What is the limit on the device number in Linux for a USB bus?

I am developing a remote monitoring device using a Raspberry Pi. In order to provide me with alerts it has 3G dongle in it. However, due to power supply instability the dongle will sometimes change device number. So, for instance, when it boots…
Rob Corlett
  • 43
4
votes
2 answers

How is the communication between northbridge and southbridge like?

How is the connection/communication between northbridge and southbridge like? It seems that data must pass from the CPU to the northbridge, and then again over a PCI bus to the southbridge, based on a picture from…
Tim
  • 17,743
3
votes
1 answer

Identifying a small IDE connector

I'm in the possession of the GENE-9455: At the top left corner there is an IDE connector, however, this is not a normal IDE connector, it's a smaller one. I need to find a cable for this connector. I also have a hard disk with a connector of the…
user187676
2
votes
1 answer

Extend ribbon cable

tl;dr: How do I find out the specification of any ribbon cable, like diameter, resistance, and so on? I recently bought a DRAC (Dell Remote Access Controller) for my PowerEdge2900 off ebay today. But as I just noticed (sadly after ordering) the…
farosch
  • 401
2
votes
0 answers

What is in-service expansion in token passing bus network?

I was reading about Token Ring network and it said "in-service expansion is possible in a token passing bus network". What does it mean?
Frozen Crayon
  • 121
  • 3
1
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