TYAN S5221 User Manual page 33

32 Bit I/O
Enables or disables 32 bit data transfer mode.
Enabling this option causes the PCI hard disk interface controller to
bundle together two 16-bit chunks of data from the drive into a 32-bit
group, which is then transmitted to the processor or memory. This
results in a small performance increase.
Disabled / Enabled
Transfer Mode
These modes determine the speed at which data is transferred to and
from the drive. The Auto option automatically determines the correct
transfer rates.
Standard / Fast PIO 1 / Fast PIO 2 / Fast PIO 3 / Fast PIO 4 / FPIO 3 /
DMA 1 / FPIO 4 / DMA 2
Ultra DMA Mode
Enables or disables Ultra DMA Mode.
Ultra DMA (UDMA, or, more accurately, Ultra DMA/33) is a protocol for
transferring data between a hard disk drive through the computer's data
paths (or bus) to the computer's random access memory (RAM). The
Ultra DMA/33 protocol transfers data in burst mode at a rate of 33.3
MBps (megabytes per second), twice as fast as the previous Direct
Memory Access (DMA) interface.
Ultra DMA support in your computer means that it will boot (start) and
open new applications more quickly. It will also help users of graphics-
intensive and other applications that require large amounts of access to
data on the hard drive. Ultra DMA uses Cyclical Redundancy Checking
(CRC), offering a new level of data protection.
Disabled / Mode 0 / Mode 1 / Mode 2 / Mode 3 / Mode 4 / Mode 5 /
Mode 6
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