Technical data

Register Descriptions
MVME4100 Single Board Computer Programmer’s Reference (6806800H19B)
31
3.1.4 NOR Flash Control/Status Register
The MVME4100 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.
USR2_LED User LED 2. This bit is used to control the planar USR2 LED. A set condition illuminates the
LED and a cleared condition extinguishes the LED.
USR3_LED User LED 3. This bit is used to control the planar USR3 LED. A set condition illuminates the
LED and a cleared condition extinguishes the LED.
RSVD Reserved for future implementation
Table 3-5 NOR Flash Control/Status Register
REG NOR Flash Control/Status Register - 0xF200 0003
BIT76543210
Field RSVD RSVD RSVD MAP_SE
L
F_WP_S
W
F_WP_H
W
FBT_BLK
_SEL
FLASH_
RDY
OPERRRRR/WR/WRRR
RESET00001XX1
FLASH_RDY 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.
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 (see Figure 3-1).
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 NOR Flash bank is write
protected. A cleared condition indicates that the flash bank is not write protected.