belongs to different banks, each bank can have different size, type, speed
of memory. SDRAM and EDO DIMMs can be mixed within the
memory array. There are no jumper settings required for the memory
size and type, which are automatically detected by the BIOS.
1.9 Accelerated Graphics Port (AGP) Slot
The P6F94 mainboard is equipped with an Accelerated Graphic Port
slot which is compliant to the AGP specification. The AGP runs at
66.6MHz clock and supports both 1x and 2x mode for 66.6MHz and
133MHz 3.3V devices. The data transfer rate on the AGP bus can be 4
times faster than PCI bus.
The following is a clock frequency for different system clock
operating modes:
1.10 Enhanced IDE Support
The P6F94 mainboard provides two enhanced high performance PCI
IDE interfaces capable of supporting four devices with PIO mode 0
through mode 4, bus-mastering DMA mode 2, and bus-mastering Ultra
DMA/33 ATAPI devices. Detection of IDE device type and transfer rate
is automatically performed by the BIOS. The traditional PIO IDE device
requires a substantial amount of CPU bandwidth to handle all the
activities of IDE access including waiting for mechanical activities. The
Bus Master logic designed in the Intel 82440LX/EX chipset is intended
to reduce the workload of the CPU, hence increasing CPU efficiency.
The Bus Master takes care of the data transfer between IDE and
memory, and lets the CPU handle other tasks. In true multi-tasking
operating systems such as Windows 95, Windows98, Windows NT, and
OS/2, by using bus-mastering IDE, the CPU workload can be reduced to
complete other tasks while disk data transfers are occurring. The driver
must be loaded in order to make the EIDE drive operate in bus-
mastering DMA mode.
System Clock
AGP Clock
PCI Clock
ISA Clock
66MHz
66MHz
33MHz
8.3MHz
68MHz
68MHz
34MHz
8.5MHz
75MHz
75MHz
37.5MHz
9.4MHz
P6F94 User’s Manual 13
Chapter 1: Introduction
