Intel MPCBL0010 manual Fpga Version 0A00h, Version Programmable logic version, Debug LED 0A01h

Addressing—MPCBL0010 SBC

Note: POST codes are not always 16-bit and the high byte in register 81h could be unrelated to the content of register 80h. Also, only a 16-bit Write to I/O 80h will write to I/O 81h. An 8-bit Write to I/O 81h is ignored.

Table 70.	FPGA Version 0A00h
	Address	Action	D7	D6	D5		D4	D3	D2	D1	D0
		Read				Version
	0xA00	Write	Reserved			NU
		Reset				Version
	Version: Programmable logic version.
Table 71.	Debug LED 0A01h
	Address	Action	D7	D6	D5		D4	D3	D2	D1	D0
		Read	MfgFlag	RJ45	EnHD		EnPost	EnClk	Green0	Amber0	Red0
	0xA01	Write	MfgFlag	RJ45	EnHD		EnPost	EnClk	Green0	Amber0	Red0
		Reset	0/NA	1	0		1	0	0	0	0

EnHD: Setting this bit uses LED Amber0 for displaying hard disk activity.

EnPost: Enables using the debug LED to display the last POST code of the boot. The BIOS clears this bit prior to the operating system launch.

EnClk: Enables telecom clock monitoring on the debug LED. EnHD and EnPost must be cleared. When the LED is green, both clocks are present. When the LED is amber, only one clock is present. When the LED is red, no clock is present or the Telco Clock PLD is not initialized. This is a debug mode.

Green0/Red0/Amber0: Debug LED 0. Used as a debug LED or to display POST codes (default during boot) or hard disk activity (default following boot) or as an end-user status/debug LED.

RJ45: This bit tells the FPGA which LEDs should reflect LAN activity; RJ-45 LEDs or grouped LEDs. The BIOS should set this bit as soon as possible to reflect the configuration of the fabric LAN. This should be set to 0 if the LAN goes to the fabric.

MfgFlag: A memory element used by the BIOS and test software in manufacturing.

Note: Tthis bit is cleared on a power-up, but is not affected by a reset

The Debug LED is amber/green when in Reset (this is hardware). As soon as the FPGA is programmed, the LED is amber and is enabled for POST code display. If the BIOS fails, it is possible to read the POST code. If the BIOS succeeds, it disables the POST code and enables HD activity on the green LED. If needed, the application software can then disable hard disk activity reporting and directly control the bi-color LED for status reporting.

To read the 8-bit POST code:

•Both colors: Start of POST sequence.

•Amber blink: This is the high nibble. 0 to 15 blinks represent hexadecimal 0 to F.

•Green blink: This is the low nibble. 0 to 15 blinks represent hexadecimal 0 to F.

	Intel NetStructure® MPCBL0010 Single Board Computer
October 2006	Technical Product Specification
Order Number: 304120	97