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MVME3100 Single Board Computer Installation and Use (6806800M28C)
109
6.1.5 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: 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 6-4 System Status Register
REG System Status Register — 0xE2000000
BIT 76543210
FIELD
RSVD
RSVD
RSVD
SAFE_START
ABORT
RSVD
BD_TYPE
OPER R
RESET 000X0000