Desktop Board Features
19
To estimate the total amount of standby current required for a particular system configuration,
standby current requirements of all installed components must be added. Refer to the descriptions
in Table 4 and follow the steps outlined below:
1. Note the total Desktop Board D850EMD2 or D850EMV2 standby current requirement.
2. Add to that the total PS/2 port standby current requirement if a wake-enabled device is
connected.
3. Add, from the PCI 2.2 slots (wake-enabled) row, the total of the number of wake-enabled
devices installed (PCI and AGP) multiplied by the standby current requirement.
4. Add, from the PCI 2.2 slots (non-wake-enabled) row, the total of the number of
non-wake-enabled devices installed (PCI and AGP) multiplied by the standby current
requirement.
5. Add all additional wake-enabled devices’ and non-wake-enabled devices’ standby current
requirements as applicable.
6. Add all the required current totals from steps 1 through 5 to determine the total estimated
standby current power supply requirement.
Table 4.
Standby Current Requirements
Instantly Available Current
Support
Description
Standby Current
Requirements (mA)
Estimate for integrated board
components
Total for the Desktop Board D850EMD2 or
D850EMV2
770*
PS/2 ports
**
345
PCI 2.2 slots (wake-enabled)
375
PCI 2.2 slots (non-wake-enabled)
100
CNR** (wake enabled)
875
CNR** (non-wake enabled)
40
Estimate for add-on components
(Add to integrated board components
shown above)
USB ports
**
700
* Refer to the
Intel
®
Desktop Board D850EMV2/D850EMD2 Technical Product Specification
for the exact standby current
requirements
** Dependent upon system configuration
✏
NOTE
PCI requirements are calculated by totaling the following:
•
One wake-enabled device @ 375 mA
•
Five non-wake-enabled devices @ 20 mA each
PS/2 Ports requirements per the IBM PS/2 Port Specification (Sept 1991):
•
Keyboard @ 275 mA
•
Mouse @ 70 mA
USB requirements are calculated by totaling the following:
•
One wake-enabled device @ 500 mA
•
USB hub @ 100 mA
•
Three USB non-wake-enabled devices @ 2.5 mA each
•
The USB ports are limited to a combined total of 700 mA
Summary of Contents for D850EMV2L - Desktop Board Motherboard
Page 1: ...Intel Desktop Boards D850EMD2 and D850EMV2 Product Guide Order Number A85186 003 ...
Page 38: ...Intel Desktop Boards D850EMD2 and D850EMV2 Product Guide 38 ...
Page 72: ...Intel Desktop Boards D850EMD2 and D850EMV2 Product Guide 72 ...
Page 78: ...Intel Desktop Boards D850EMD2 and D850EMV2 Product Guide 78 ...