Emerson MVME7100 Safe Start Switch, Boot Block B Select, Flash Bank Write Protect, JTAG Pass-Thru

Hardware Preparation and InstallationSMT Configuration Switch, S1

Table 2-5 Configuration Switch Settings (S1) (continued)

Switch	Description	Setting	Function
S1-5	CORE1 Low	[OFF]	Normal operation
	Memory Offset	ON
S1-6	PMC 133 MHz	[OFF]	PMC 100 MHz maximum
		ON	PMC 133 MHz maximum
S1-7	Master WP	[OFF]	Master write protect disabled
		ON	Master write protect enabled
S1-8	Reserved

1. Switch status is readable from System Status Register 1, bit 5.

2.4.1.1Safe Start Switch

When the SAFE_START switch is OFF, it indicates that the normal ENV setting should be used. When the switch is set to ON, GEVs, VPD, and SPD settings are ignored and known, safe, values are used.

2.4.1.2Boot Block B Select

When the switch is OFF, the flash memory map is normal and block A is selected as shown in Figure 3. When the switch is ON, block B is mapped to the highest address.

2.4.1.3Flash Bank Write Protect

When the FLASH BANK WP switch is OFF, it indicates that the entire NOR flash is not write- protected. NOR flash is used for executing code. When the switch is ON, it indicates that the flash is write-protected and any writes to the flash devices are blocked by hardware.

2.4.1.4JTAG Pass-Thru

The JTAG Pass-Thru switch is in the OFF position for normal operation. The switch is ON for pass-through mode.

2.4.1.5Low Memory Offset

The CORE1 Low Memory Offset switch is in the OFF position for normal operation. The switch is ON for enabling this feature.

2.4.1.6PMC 133 MHz

The PMC 133 MHz switch is OFF for normal operation. When the switch is ON, the maximum frequency of operation for the PMC sites is 133 MHz. 133 MHz operation should not be enabled unless the PMC modules are designed to support 133 MHz operation. When the switch is OFF, the maximum frequency is 100 MHz.

38 MVME7100 Single Board Computer Installation and Use (6806800E08A)