User`s manual

DIGITAL-LOGIC AG MSMP5 / P3 SEN/SEV Manual V1.6A
47
4.7.1 Harddisk PIO Modes
Block Mode Transfer: Block mode boots IDE drive performance by
(Multi-Sector) increasing the amount of data transferred.
No Block Mode: 512 Byte per interrupt
Block Mode: up to 64 kByte per interrupt
LBA Mode: LBA (logical block addressing) is a new method
of addressing data on a disk drive. In the standard
ST506 (MFM) ISA hard disk, data is accessed via
a cylinder - head - sector format.
LBA Mode disabled: max. 528 MByte per Disk
LBA Mode enabled: max. 8 Gbyte per Disk
Attention:
The BIOS enables the LBA Mode only, if the harddisk
was formatted on a system with enabled LBA. If the
drive (capacity > 528MB) is formatted on a system
with disabled LBA, the Core BIOS will never enable
the LBA mode !
The maximum parameters are:
1024 Cyl., 16 heads, 63 Sec/Track
32Bit Transfer: Some operating system can handle two 16Bit word as
one 32Bit access. This accelerates the IDE transfer.
Advanced PIO Modes: PIO-Mode: Timing: Transferspeed: Remarks:
IDE 0 600ns 2 MByte/sec Slowest I/O
IDE 1 383ns 5.5MByte/sec Standard I/O
EIDE 2 240ns 8.3MByte/sec Fast I/O, Mem.
EIDE 3 180ns 11,3MByte/sec IORDY Protocol
EIDE 4 120ns 16,6MByte/sec IORDY Protocol
EIDE DMA 1 160ns 13,3MByte/sec DRQ, ATA-2
Warning: Always begin with the PIO-Mode 0 in the manual mode (not autodetect)
to test a new drive or if you have troubles in the automatic mode.
The autodetect mode of some drives select wrong PIO modes.