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Board Description and Memory Maps
USR1_LED: User LED 1. This bit controls the USR1 LED located on the front panel. A set
condition illuminates the front-panel LED and a cleared condition extinguishes the front-panel
LED.
USR2_LED: User LED 2. This bit controls the planar USR2 LED. A set condition illuminates
the LED and a cleared condition extinguishes the LED.
USR3_LED: User LED 3. This bit controls the planar USR3 LED. A set condition illuminates
the LED and a cleared condition extinguishes the LED.
RSVD: Reserved for future implementation.
1.3.8
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.
24
Flash Control/Status Register - 0xE2000003
7
6
5
R
R
R
0
0
0
MVME3100 Single Board Computer Programmer's Reference (6806800G37A)
Flash Control/Status Register
4
3
2
R/W
R/W
R
0
1
X
1
0
R
R
X
1
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