EMS Vigilant-X Series User Manual page 10

Address Space
The 32-bit Intel architecture has a 4GB address space. System RAM occupies the bottom
part of the address space. The system BIOS occupies the top part of the address space. PCI
devices are assigned parts of the remaining address space by the motherboard BIOS shortly
after the system is switched on or reset.
A Vigilant-X requires 1MB + 128MB of address space.
You can calculate the minimum amount of address space required for the Vigilant-X cards.
For example, the minimum address space required for a 24-screen system is calculated as
follows:
At least 6 x (1MB + 128MB) = 774MB address space is required for the Vigilant-X cards.
The actual amount of address space used by the motherboard BIOS for Vigilant-X cards
varies. The parts of address space allocated to the Vigilant-X must be aligned on boundaries.
Different motherboard BIOSs use different algorithms to allocate the parts of the address
space. Some motherboard BIOSs do not pack the allocated address ranges together
efficiently.
In addition to the memory and the Vigilant-X cards there are other PCI devices in the system
which require address space.
Power
The amount of current a power supply can deliver on each voltage rail is limited. Often there
is also a limit on the total power.
Each Vigilant-X card requires +5V @ 1.7A and +3.3V @ 3.5A.
Each Vigilant-Xplus card requires +5V @ 2.5A and +3.3V @ 3.5A
Each Vigilant-XSQ card requires +5V @ 5A and +3.3
You can calculate the amount of current and the amount of power required for the Vigilant-X
cards. For example, the requirements for a 24-screen system of Vigilant-Xplus cards is
calculated as follows:
Current
+3.3V 6 x 3.5A = 21A
+5V 6 x 2.5A = 15A
Power
( 3.3V x 21A ) + ( 5V x 15A ) = 144W
These are the requirements for the Vigilant-X cards, you must take into account the
requirements of all the other devices in the system.
10
16/03/2006