Manual Number: 40110-005-2
Page 52
Block Mode
This option supports transfer of multiple sectors to and from the specified primary or secondary
IDE drive.
Block mode boosts IDE drive performance by increasing the amount of data transferred during an
interrupt. Block mode allows transfers of up to 64KB per interrupt, whereas only 512 bytes of data
can be transferred per interrupt if block mode is not used.
If Block Mode is set to On and is supported by the IDE drive, AMIBIOS enables multi-sector
transfers. AMIBIOS sets the number of sectors to be transferred per interrupt to the value returned
by the “identify drive” command.
Available options are:
Off
On
Programmed I/O Mode
IDE PIO mode programs timing cycles between the IDE drive and the programmable IDE control-
ler. As the PIO mode increases, the cycle time decreases.
Set the PIO Mode option to Auto to have AMIBIOS select the PIO mode used by the IDE drive
being configured. If you select a specific value for the PIO mode, you must make absolutely
certain that you are selecting the PIO mode supported by the IDE drive being configured.
Available options are:
Auto
0
3
1
4
2
5
32Bit Mode
Hard disk drives connected to the processor board via the ISA Bus transfer data 16 bits at a time.
An IDE drive on the PCI Local Bus can use a 32-bit data path.
If the 32Bit Mode parameter is set to On, AMIBIOS enables 32-bit data transfers. If the host
controller does not support 32-bit transfer, this feature must be disabled.
Available options are:
Off
On
Summary of Contents for SB686P Series
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