Safe Start Switch; Boot Block B Select; Flash Bank Write Protect; Jtag Pass-Thru - SMART Embedded Computing MVME7100ET Installation And Use Manual

Hardware Preparation and Installation
Table 2-5
Switch
S1-3
S1-4
S1-5
S1-6
S1-7
S1-8
1. Switch status is readable from System Status Register 1, bit 5.
2.4.1.1

Safe 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.
2.4.1.2

Boot 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.
2.4.1.3

Flash 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.
2.4.1.4

JTAG Pass-Thru

The JTAG Pass-Thru switch is in the OFF position for normal operation. The switch is ON
for pass-through mode.
38
Configuration Switch Settings (S1) (continued)
Description Setting
[OFF
Flash Bank WP
ON
[OFF]
JTAG Pass Thru
ON
CORE1 Low [OFF
Memory Offset ON
[OFF]
PMC 133 MHz
ON
[OFF]
Master WP
ON
Reserved
MVME7100ET Single Board Computer Installation and Use (6806800K87G)
Hardware Preparation and Installation
Function
Entire flash not write-protected
Flash is write-protected
Normal operation
Pass-Thru mode
Normal operation
PMC 100 MHz maximum
PMC 133 MHz maximum
Master write protect disabled
Master write protect enabled