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Interfaces and Connectors
Bengal (VL-EPMe-30) Reference Manual
32
Power Button
Connector J18 includes an input for a power button. Shorting J18 pin 41 to ground causes the
board to enter an S5 power state (similar to the Windows Shutdown state). Shorting it again
returns the board to the S0 power state and reboots the board. The button 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).
The input can be connected to ground using the normally open contacts of a pushbutton switch or
a relay, or with a switching transistor (open-collector or open-drain) capable of sinking 1 mA. The
input must be driven to a voltage between 0 V and 500 mV to be recognized by the Bengal. Do not
add an external pull-up resistor to this signal.
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-5015 paddleboard (S1). Header J2 on the paddleboard
also provides a power button signal on pin 13 and ground on pin 14.
In configurations where a power button is not connected to the board, if the system is put into an
S5 state, power can be restored by turning off the power supply and turning it back on. This
behavior is set by default in the BIOS.
Supported Power States
Table 15 lists the supported power states.
Table 15: 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).