Intel MPCBL0010, Intel NetStructure Single Board Computer manual PwrBtn usage

Addressing—MPCBL0010 SBC

UART: UART override;

when set, the serial port to the IPMC will take-over the SBC serial port.

when cleared, the IPMC will receive the data (RX) for monitoring purposes but will not be able to transmit

LTYPE: LED type.

when cleared, whenever possible, amber LEDs are used instead of red. when set, red is used instead of amber.

Applicable LEDs: Postcode/HardDisk/Debug LED.

PwrBtn: ICH Power Button Control. This bit can be set, but it cannot be cleared. It will clear itself when the power sequencing requested is completed (i.e. TurnX=0).

Note: This bit should only be set when TurnX is 0. This bit will not work when a test-jig is inserted and its TEST_ON# signal is asserted (Override power-on in absence of firmware in IPMC).

TurnX: Turn ON or turn OFF in progress.

BoardON: Power status of the board 1 = Board ON

HTU: Hard Turn-Off. Turns off power supplies regardless of the chipset state. Writing a 1 to this bit will turn off the power supply immediately.

On a Read, this will always return 0.

9.3.0.1PwrBtn usage

For a power up:

1.IPMC sets bit PowerBtn

2.FPGA asserts PowerBtn ICH input and waits for the ICH to de-assert its "suspend" output

3.When "suspend" is de-asserted, the FPGA de-asserts the power button and turns off all supplies.

For a power down:

1.IPMC sets bit PowerBtn

2.FPGA asserts PowerBtn for 33 ms (ICH debouncer delay is 16 ms)

3.FPGA waits for the ICH "suspend" output to be de-asserted. Then it turns off all supplies.

Note: There is no timeout and if the operating system does not shut down, the board remains stuck in this condition.

The IPMC must implement a timeout of reasonable length (i.e. seconds) and perform a hard turn-off (i.e. HTO=1) in the case of a timeout.

Quick power-down:

1.IPMC sets bit HTO.

2.FPGA turns off all supplies.

Note: The “suspend” information from the chipset does not reflect the state of the power supply.

	Intel NetStructure® MPCBL0010 Single Board Computer
October 2006	Technical Product Specification
Order Number: 304120	105