Specifications

© 2008 Advanced Micro Devices Inc.
IDE Controller
AMD SB600 BIOS Developer’s Guide (Public Version) Proprietary
Page 29
6.3.2 Ultra-DMA Mode
The SB600 IDE controller supports UDMA mode 0, 1, 2, 3, 4, 5, and 6.
It only takes two simple steps to program the SB600 IDE controller into the UDMA mode:
1. Set the mode number in UDMA mode register (Reg56h).
2. Enable the UDMA mode through the UDMA control register (Reg54h). The UDMA bus-
cycle timing is fixed after the UDMA mode is selected.
UDMA Mode Bus-Cycle Timing (ns)
0 120
1 90
2 60
3 45
4 30
5 20
6 15