Reset Switch Control Register - Motorola MVME172 Programmer's Reference Manual

MC2 Chip

RESET Switch Control Register

3
ADR/SIZ
BIT
NAME
OPER
RESET
3-42
The switch on the MVME172 front panel and several status and
RESET
control bits are defined by this register.
31 30 29
R R R
0 0 0
RSWE The
RESET
VMEbus interface'' option. This bit is duplicated at the
same bit position in the VMEchip2 at location
$FFF40060. When this bit is high, or the duplicate bit in
the VMEchip2 is high, the
When both bits are low, the
BDFLO When this bit is high, the MC2 chip asserts the BRDFAIL
signal pin. This signal is wired-or to the VMEchip2 board
fail pin. It controls the board fail (
MVME172.
CPURS When this bit is set high, the power-up reset status bit is
cleared. This bit is always read zero.
PURS This bit is set by a power-up reset. It is cleared by a write
to the CPURS bit.
BRFLI When this status bit is high, the BRDFAIL signal pin on
the MC2 chip is asserted. When this status bit is low, the
BRDFAIL signal pin on the MC2 chip is not asserted. The
BRDFAIL pin may be asserted by an external device, the
BDFLO bit in this register, or a watchdog time-out.
$FFF42044 (8 bits)
28 27 26
BRFLI PURS CPURS
R R C
1 PL 1 P 0
switch enable bit is used with the ''no
RESET
RESET
Computer Group Literature Center Web Site
25 24
BDFLO RSWE
R/W R/W
1 PL 1 P
switch is enabled.
switch is disabled.
) LED on the
FAIL