AOpen AX5TC User Manual page 97

Mode Clock per
33MHz
PCI
PIO mode 0 30ns
PIO mode 1 30ns
PIO mode 2 30ns
PIO mode 3 30ns
PIO mode 4 30ns
DMA mode 0 30ns
DMA mode 1 30ns
DMA mode 2 30ns
30ns
DMA/33
Q: What is Flash ROM BIOS? What is the BIOS size?
A: All the mainboards need BIOS (Basic Input/Output System). BIOS is a set of
basic I/O control routine grouped together, it provides low level hardware
support to the operating system. Traditional mainboard stores BIOS code in
EPROM (Erasable Programmable ROM), if BIOS has to be upgraded, you
need to remove EPROM from mainboard, clear by ultra-violet (UV) light, re-
program, and then insert back.. AOpen mainboards use much easier Flash
ROM, only Flash ROM programming utility is necessary, no need to open
housing and change the BIOS ROM. You may connect to http://
www.aopen.com.tw to download BIOS for upgrade.
Q: Why will the system BIOS assign an IRQ to the PCI VGA card?
A: Based on the PCI/PnP specification, system BIOS will automatically assign
an IRQ to each PCI add-on card detected regardless of VGA requirement. If
you do not want BIOS to assign an IRQ to the installed PCI VGA card, enter
the BIOS PCI/PnP Setup and set the specific PCI slot IRQ Priority to "
Q: What is ACPI (Advanced Configuration & Power Interface) and OnNow?
A: The ACPI is new power management specification of 1997 (PC97). It intends
to save more power by taking full control of power management to operating
system and not through BIOS. Because of this, the chipset or super I/O chip
needs to provide standard register interface to OS (such as Win97) and
provides the ability for OS to shutdown and resume power of different part of
chip. The idea is a bit similar to the PnP register interface.
ACPI defines momentary soft power switch to control the power state
transition. Most likely, it uses the ATX form factor with momentary soft power
switch. The most attractive part of ACPI for desktop user is probably the
Frequently Asked Questions
Clock Cycle Data Transfer rate
count time
20 600ns (1/600ns) x 2byte = 3.3MB/s
13 383ns (1/383ns) x 2byte = 5.2MB/s
8 240ns (1/240ns) x 2byte = 8.3MB/s
6 180ns (1/180ns) x 2byte = 11.1MB/s
4 120ns (1/120ns) x 2byte = 16.6MB/s
16 480ns (1/480ns) x 2byte = 4.16MB/s
5 150ns (1/150ns) x 2byte = 13.3MB/s
4 120ns (1/120ns) x 2byte = 16.6MB/s
4 120ns (1/120ns) x 2byte x2 = 33MB/s
None".
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