MVME3100 Programmer’s Guide (V3100A/PG1)
Chapter 1 Board Description and Memory Maps
10
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_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.
Table 1-7. System Control Register
REG
System Control Register - 0xE2000001
BIT
7
6
5
4
3
2
1
0
FIELD
BD_RESET
RSVD
RSVD
RSVD
EEPR
OM
_WP
TST
A
T
_
M
ASK
OPER
R/W
R
R
R
R/W
R/W
RESET
0
0
0
0
0
X
1
1