Nor Flash Control/Status Register; Table 3-5 Nor Flash Control/Status Register - SMART Embedded Computing MVME7100ET Programmer's Reference Manual

Register Descriptions
3.1.4

NOR Flash Control/Status Register

The MVME7100ET Flash Control/Status Register provides software controlled bank write
protect and map select functions as well as boot block select, bank write protect, and
activity status for the NOR flash.
Table 3-5
REG
BIT
Field
OPER
RESET 0
FLASH_RDY
FBT_BLK_SEL Flash Boot Block Select. This bit reflects the current state of the Boot Block
F_WP_HW
F_WP_SW
MAP_SEL
RSVD
32
NOR Flash Control/Status Register
NOR Flash Control/Status Register - 0xF200 0003
7 6 5
RSVD RSVD RSVD
R R R
0 0
Flash Ready. This bit provides the current state of the NOR flash devices
Ready/Busy# pins. These open drain output pins from each flash device
are wire OR'd to form Flash Ready. Refer to the appropriate flash device
data sheet for a description on the function of the Ready/Busy# pin.
B Select switch. A cleared condition indicates that boot block A is selected
and mapped to the highest address (see Figure 4). A set condition
indicates that boot block B is selected and mapped to the highest address
(see Figure 3-1).
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 NOR Flash bank is write protected. A cleared condition indicates that
the flash bank is not write protected.
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
HW write-protect bit is not set. This bit is set during reset and must be
cleared by the system software to enable writing of the flash devices.
Memory Map Select. When this bit is cleared, the flash memory map is
controlled by the Flash Boot Block Select switch (see the MVME7100ET
Installation and Use manual for switch settings). When the Map Select bit
is set, boot block A is selected and mapped to the highest address (see
Figure 3-1).
Reserved for future implementation.
MVME7100ET Single Board Computer Programmer's Reference (6806800K88C)
4 3 2
MAP_S F_WP_S F_WP_
EL W HW
R/W R/W R
0 1 X
Register Descriptions
1 0
FBT_BL FLASH_
K_SEL RDY
R R
X 1