Hi,
> The first advantage of AGP bus is that this one can be considered as 'a
> second' PCI bus with only one peripheral ( this explain the full
> bandwith operation for one slot ) and the frequency of the bus which is
> 66MHz against 33MHz for the PCI.
As "The Linux Kernel" from the LDP says in Chapter 6 on PCI,
which can be easily veryfied, AGP is a PCI bus closer to the
CPU and memory with the devices video and two bridges, the
PCI/PCI and PCI/ISA, respectively.
On an Intel440BX AGP set, however, the Host bridge is the
central device connected to main memory, to the host bus which
the processor(s) are plugged in, to the AGP bus with only one
(sic!) device, AND the primary PCI bus, bus #0, with usulally
more devices on it, especially the PCI/ISA bridge with IDE ports,
USB and ISA connected to it. Then the AGP bus can be configured
as secondary PCI bus, bus #1, nevertheless being more performant,
as bus frequency for the Intel440 is 133MHz.
If there were some DAQ boards for this secondary PCI bus, the
latency of interrupts must be smaller which might be an issue
for real time as long interrupt lines follow the bus structure.
peterw
--
Dr. Peter Wurmsdobler
CTM - Centre de Transfert des Microtechniques
39, av. de l'Observatoire, BP-1445, 25007 Besancon CEDEX 3
TELEPHONE: +33 3 81 47 70 20 TELECOPIE: +33 3 81 47 70 21
E-mail: [EMAIL PROTECTED]
Ceterum censeo MIRCOSOFTem esse delendam.
--- [rtl] ---
To unsubscribe:
echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
----
For more information on Real-Time Linux see:
http://www.rtlinux.org/~rtlinux/
