Board Features
VL-EPU-4562/4462 Reference Manual
24
Do not use wire smaller than 22 AWG. Use high quality UL 1007 compliant stranded wire.
The length of the wire should not exceed 18 inches.
Avoid using any additional connectors in the power delivery system.
The power and ground leads should be twisted together, or as close together as possible to
reduce lead inductance.
A separate conductor must be used for each of the power pins.
All power input pins and all ground pins must be independently connected between the
power source and the power connector.
Use a high quality power supply that can supply a stable voltage while reacting to widely
varying current draws.
Power Button
The User I/O connector (shown in Figure 16 on page 38) includes an input for a power button. A
momentary short to ground or assertion of pin 17 will cause a power button ACPI event. The
button event can be configured in Windows to enter an S3 power state (Sleep, Standby, or
Suspend-to-RAM), an S4 power state (Hibernate or Suspend-to-Disk), or an S5 power state
(Shutdown or Soft-Off). This connector uses IEC 61000-4-2-rated TVS components to help
protect against ESD damage.
A power button is provided on the VL-CBR-4005B paddleboard. Refer to the chapter titled VL-
CBR-4005B Paddleboard, beginning on page 56 for more information.
Supported Power States
The next table lists the Blackbird’s supported power states.
Table 4: Supported Power States
Power State
Description
S0 (G0)
Working
S1 (G1-S1)
All processor caches are flushed and the CPUs stop executing instructions. Power to
the CPUs and RAM is maintained. Devices that do not indicate they must remain on
may be powered down.
S3 (G1-S3)
Commonly referred to as Standby, Sleep, or Suspend-to-RAM. RAM remains powered.
S4 (G1-S4)
Hibernation or Suspend-to-Disk. All content of main memory is saved to non-volatile
memory, such as a hard drive, and is powered down.
S5 (G2)
Soft Off. Almost the same as G3 Mechanical Off, except that the power supply still
provides power, at a minimum, to the power button to allow return to S0. A full reboot is
required. No previous content is retained. Other components may remain powered so
the computer can "wake" on input from the keyboard, clock, modem, LAN, or USB
device.
G3
Mechanical off (ATX supply switch turned off).