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MVME3100 Single Board Computer Installation and Use (6806800M28C)
110
6.1.6 System Control Register
The MVME3100 board System Control register provides board control bits.
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.
Table 6-5 System Control Register
REG System Control Register - 0xE2000001
BIT 76543210
FIELD
BD_RESET
RSVD
RSVD
RSVD
EEPROM_WP
TSTAT_MASK
OPER R/W R R R R/W R/W
RESET00000X11