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Chapter 1 Board Description and Memory Maps
Flash Control/Status Register
The MVME3100 provides software-controlled bank write protect and map select functions as well as
boot block select, bank write protect, and activity status for the Flash.
Table 1-9. Flash Control/Status Register
REG
BIT
FIELD
OPER
RESET
FLASH_RDY
Flash ready. This bit provides the current state of the Flash devices' Ready/Busy# pins. These open
drain output pins from each Flash device are wire OR'd to form Flash Ready.
FBT_BLK_SEL
Flash boot block select. This bit reflects the current state of the BOOT BLOCK B SELECT switch.
A cleared condition indicates that boot block A is selected and mapped to the highest address. A
set condition indicates that boot block B is selected and mapped to the highest address.
F_WP_HW
Hardware Flash bank write protect switch status. This bit reflects the current state of the FLASH
BANK WP switch. A set condition indicates that the entire Flash bank is write protected. A cleared
condition indicates that the Flash bank is not write protected.
F_WP_SW
Software Flash bank write protect. This bit provides software-controlled protection against
inadvertent writes to the Flash memory devices. A set condition indicates that the entire Flash is
write-protected. A cleared condition indicates that the Flash bank is not write-protected, only when
the hardware write-protect bit is also not set. This bit is set during reset and must be cleared by the
system software to enable writing of the Flash devices.
MAP_SEL
Memory map select. When this bit is cleared, the Flash memory map is controlled by the Flash Boot
Block Select switch. When the map select bit is set, boot block A is selected and mapped to the
highest address.
RSVD
Reserved for future implementation.
12
MVME3100 Programmer's Guide (V3100A/PG1)
Flash Control/Status Register - 0xE2000003
7
6
5
4
R
R
R
R/W
0
0
0
0
3
2
1
0
R/W
R
R
R
1
X
X
1
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