Table of Contents
Advertisement
System Indicator Register
Table 1-7 System Control Register (continued)
REG
FIELD
OPER
RESET
TSTAT_MASK: Thermostat mask. This bit masks the DS1621 temperature sensor thermostat
output. If this bit is cleared, the thermostat output is enabled to generate an interrupt. If the bit
is set, the thermostat output is disabled from generating an interrupt.
EEPROM_WPEEPROM: Write protect. This bit provides protection against inadvertent writes
to the on-board EEPROM devices. Clearing this bit will enable writes to the EEPROM devices.
Setting this bit write protects the devices. The devices are write protected following a reset.
BRD_RST: Board reset. These bits force a hard reset of the board. If a pattern is written in bits
5-7 where bit 7 is set, bit 6 is cleared, and bit 5 is set (101), a hard reset is generated. Any other
pattern written in bits 5-7, does not generate a hard reset. These bits are cleared automatically
when the board reset has been completed. These bits are always cleared during a read.
RSVD: Reserved for future implementation.
1.3.7
System Indicator Register
The MVME3100 board provides a System Indicator register that may be read by the system
software to determine the state of the on-board status indicator LEDs or written to by system
software to illuminate the corresponding on-board LEDs.
Table 1-8 System Indicator Register
REG
BIT
FIELD
OPER
RESET
BRD_FAIL: Board fail. This bit controls the board fail LED located on the front panel. A set
condition illuminates the front-panel LED and a cleared condition extinguishes the front-panel
LED.
MVME3100 Single Board Computer Programmer's Reference (6806800G37A)
System Control Register - 0xE2000001
R/W
0
0
0
System Indicator Register - 0xE2000002
7
6
5
R
R
R
0
0
0
Board Description and Memory Maps
R
R
R
0
0
X
4
3
2
R
R/W
R/W
0
0
0
R/W
R/W
1
1
1
0
R/W
R/W
0
1
23
Advertisement
Table of Contents
