Download NLX Motherboard Specification

NLX Motherboard Specification
Release 1.8
6. Recommendations
6.1 Recommended IDSEL Assignments for PCI Slots and
Onboard Devices
A board manufacturer can put a number of board devices on a motherboard. To avoid a
conflict, the manufacturer must know which ID selects can be used for PCI slots. Figure 26
shows the PCI slot numbers, and Table 14 lists the recommended ID select assignments.
SLO T 5
SLO T 4
SLO T 3
SLO T 2
PC I SLO TS
SLO T 1
IS A S L O T S
Figure 26. Recommended IDSEL Assignments (PCI Slot Numbers)
Table 14. Recommended IDSEL Assignments
Device number
AD line
Function
20
AD31
Slot 1
19
AD30
May not be used
18
AD29
Slot 2
17
AD28
May not be used
16
AD27
Slot 3
15
AD26
Free
14
AD25
Slot 4
13
AD24
Free
12
AD23
Slot 5 or PCI-PCI bridge for larger riser cards
11..6
AD22..17
Free
5
AD16
Reserved for AGP on board
4..1
AD15..12
Reserved for on board devices
0
AD11
Reserved for on board devices (e.g. motherboard chipset)
White 12 point font is recommended to clearly identify each PCI slot number on the riser
card. Smaller white 8 point font is recommended to identify other connectors on the riser
(e.g., label all of the power connector pins like +12V, -12V, +5V, -5V, +5VSB, GND, etc.).
Page 62