Chapter 1 Board Description and Memory Maps
MVME3100 Programmer’s Guide (V3100A/PG1)
9
System Status Register
The MVME3100 board System Status register is a read-only register used to provide board status
information.
BD_TYPE
Board type. These bits indicate the board type.
00: VME SBC
01: PrPMC
10-11: Reserved
ABORT
Abort. This bit reflects the current state of the on-board abort signal. This is a debounced version
of the abort switch and may be used to determine the state of the abort switch. A cleared condition
indicates the abort switch is not depressed, while a set condition indicates the abort switch is
asserted.
SAFE_START
ENV safe start. This bit reflects the current state of the ENV safe start select switch. A set condition
indicates that firmware should use the safe ENV settings. A cleared condition indicates that the ENV
settings programmed in NVRAM should be used by the firmware.
RSVD
Reserved for future implementation.
Table 1-6. System Status Register
REG
System Status Register – 0xE2000000
BIT
7
6
5
4
3
2
1
0
FIELD
RSVD
RSVD
RSVD
SAFE_ST
AR
T
ABO
R
T
RSVD
BD_TYPE
OPER
R
RESET
0
0
0
X
0
0
0
0