Motorola MVME172 User Manual download pdf (Page 149)

LCSR Programming Model

http://www.mcg.mot.com/literature 2-71

Board Control Register

RSWE The RESET switch enable bit is used with the “no

VMEbus interface” option. This bit is duplicated at the

same bit position in the MC2 chip at location $FFF42044.

When this bit or the duplicate bit in the MC2 chip is high,

the

RESET switch is enabled. When both bits are low, the

RESET switch is disabled.

BDFLO When this bit is high, the VMEchip2 asserts the

BRDFAIL signal pin. When this bit is low, this bit does

not contribute to the BRDFAIL signal on the VMEchip2.

CPURS When this bit is set high, the powerup reset status bit is

cleared. This bit is always read zero.

PURS This bit is set by a powerup reset. It is cleared by a write

to the CPURS bit.

BRFLI When this status bit is high, the BRDFAIL signal pin on

the VMEchip2 is asserted. When this status bit is low, the

BRDFAIL signal pin on the VMEchip2 is not asserted.

The BRDFAIL pin may be asserted by an external device,

the BDFLO bit in this register, or a watchdog time-out.

SFFL When this status bit is high, the SYSFAIL signal line on

the VMEbus is asserted. When this status bit is low, the

SYSFAIL signal line on the VMEbus is not asserted.

SCON When this status bit is high, the VMEchip2 is configured

as system controller. When this status bit is low, the

VMEchip2 is not configured as system controller.

ADR/SIZ $FFF40060 (8 bits [7 used] of 32)

BIT 31 30 29 28 27 26 25 24

NAME SCON SFFL BRFLI PURS CPURS BDFLO RSWE

OPER RRRRCR/WR/W

RESET X X 1 PSL 1 P 0 PS 1 PSL 1 P

1 ... 148 149 150 ... 354

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Motorola MVME172 User Manual Page 149