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✏
NOTE
IBM PS/2 Port Specification (September 1991) states:
•
275 mA for keyboard
•
70 mA for the mouse (non-wake-enabled device)
PCI/AGP requirements are calculated by totaling the following:
•
One wake-enabled device @ 375 mA, plus
•
Five non-wake-enabled devices @ 20 mA each, plus
USB requirements are calculated as:
•
One wake-enabled device @ 500 mA
•
USB hub @ 100 mA
•
Three USB non-wake-enabled devices connected @ 2.5 mA each
✏
NOTE
Both USB ports are capable of providing up to 500 mA during normal S0 operation. Only one
USB port will support up to 500 mA of standby current (wake-enabled device) during S3
suspended operation. The other ports may provide up to 7.5 mA (three non-wake-enabled devices)
during S3 suspended operation.
2.11.4 Fan Connector Current Capability
The desktop boards D850EMD2/D850EMV2 are designed to supply a maximum of 1 A per fan
connector.
2.11.5 Power Supply Considerations
CAUTION
The +5 V standby line for the power supply must be capable of providing adequate +5 V standby
current. Failure to do so can damage the power supply. The total amount of standby current
required depends on the wake devices supported and manufacturing options. Refer to
Section 2.11.3 on page 80 for additional information.
System integrators should refer to the power usage values listed in Table 52 on page 79 when
selecting a power supply to use with the desktop boards D850EMD2/D850EMV2.
Measurements account only for current sourced by the desktop boards D850EMD2/D850EMV2
while running in idle modes of the started operating systems.
Additional required power will depend on configurations chosen by the integrator.
The power supply must comply with the following recommendations found in the indicated
sections of the ATX form factor specification.
•
The potential relation between 3.3 VDC and +5 VDC power rails (Section 4.2)
•
The current capability of the +5 VSB line (Section 4.2.1.2)
•
All timing parameters (Section 4.2.1.3)
•
All voltage tolerances (Section 4.2.2)
Technical Reference
81
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