Chapter 4: AMI BIOS
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a time. Select Auto to allow data transfer from and to the device occur multiple
sectors at a time if the device supports it. The options are Auto and Disabled.
PIO Mode
The IDE PIO (Programmable I/O) Mode programs timing cycles between the
IDE drive and the programmable IDE controller. As the PIO mode increases, the
cycle time decreases. The options are Auto, 0, 1, 2, 3, and 4.
Select Auto to allow the AMI BIOS to automatically detect the PIO mode. Use
this value if the IDE disk drive support cannot be determined.
Select 0 to allow the AMI BIOS to use PIO mode 0. It has a data transfer rate
of 3.3 MBs.
Select 1 to allow the AMI BIOS to use PIO mode 1. It has a data transfer rate
of 5.2 MBs.
Select 2 to allow the AMI BIOS to use PIO mode 2. It has a data transfer rate
of 8.3 MBs.
Select 3 to allow the AMI BIOS to use PIO mode 3. It has a data transfer rate
of 11.1 MBs.
Select 4 to allow the AMI BIOS to use PIO mode 4. It has a data transfer band-
width of 32-Bits. Select Enabled to enable 32-Bit data transfer.
DMA Mode
Select Auto to allow the BIOS to automatically detect IDE DMA mode when the
IDE disk drive support cannot be determined.
Select SWDMA0 to allow the BIOS to use Single Word DMA mode 0. It has a
data transfer rate of 2.1 MBs.
Select SWDMA1 to allow the BIOS to use Single Word DMA mode 1. It has a
data transfer rate of 4.2 MBs.
Select SWDMA2 to allow the BIOS to use Single Word DMA mode 2. It has a
data transfer rate of 8.3 MBs.
Select MWDMA0 to allow the BIOS to use Multi Word DMA mode 0. It has a
data transfer rate of 4.2 MBs.
Select MWDMA1 to allow the BIOS to use Multi Word DMA mode 1. It has a
data transfer rate of 13.3 MBs.
Select MWDMA2 to allow the BIOS to use Multi-Word DMA mode 2. It has a
data transfer rate of 16.6 MBs.
Select UDMA0 to allow the BIOS to use Ultra DMA mode 0. It has a data transfer
rate of 16.6 MBs. It has the same transfer rate as PIO mode 4 and Multi Word
DMA mode 2.
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