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Chapter 1 Board Description and Memory Maps
System Control Register
The MVME3100 board System Control register provides board control bits.
Table 1-7. System Control Register
REG
BIT
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_WP
EEPROM 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.
10
MVME3100 Programmer's Guide (V3100A/PG1)
System Control Register - 0xE2000001
7
6
5
4
R/W
R
0
0
0
0
3
2
1
0
R
R
R/W
R/W
0
X
1
1
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