Emerson MVME55006E manual Safe Start ENV Switch S5-1, Flash 0 Block Write Protect Switch S3-2

Hardware Preparation and Installation Safe Start ENV Switch (S5-1)

1.6.5Safe Start ENV Switch (S5-1)

This switch selects programmed or safe start ENV settings. When set to OFF, it indicates that the programmed ENV settings should be used during boot. Set to ON indicates that the safe ENV settings should be used.

Figure 1-7	S5-1 Settings
		S5-1
1		ON	1		ON
2			2
Normal ENV settings used			Safe ENV settings used
during boot				during boot
(factory configuration)

1.6.6Flash 0 Block Write Protect Switch (S3-2)

This switch supports the Intel J3 Flash family write protect feature. Set to OFF, it enables the lock-down mechanism. Blocks locked down cannot be unlocked with the unlock command. The switch must be set to ON in order to override the lock-down function and enable blocks to be erased or programmed through software. Refer to the Intel J3 Flash data sheet, listed in Appendix C, Related Documentation, for further details.

Figure 1-8 S3-2 Settings

S3-2

1	ON	1	ON
2		2
3		3
4		4

Disable Flash 0 J3	Enable Flash 0 J3
block writes	block writes
	(factory configuration)

24 MVME55006E Single-Board Computer Installation and Use (6806800A37D)