System Control Register - SMART Embedded Computing MVME4100 Programmer's Reference Manual

BD_TYPE
SAFE_START
PCI MODE
PCI 66
MASTER WP
SW8
3.1.2

System Control Register

The MVME4100 has a System Control Register that provides general board control bits.
Table 3-3
REG
BIT
Field
OPER
RESET
MVME4100 Single Board Computer Programmer's Reference (6806800H19D)
Board Type. These bits indicate the board type.
00: VME SBC
01: PrPMC
10-11: reserved
ENV Safe Start. This bit reflects the current state of the ENV safe start select
switch. A cleared condition indicates that the ENV settings programmed in
NVRAM should be used by the firmware. A set condition indicates that
firmware should use the safe ENV settings.
PCI mode. This bit reflects the current state of the PCI Mode switch. A
cleared condition indicates the switch is off. A set condition indicates the
switch is on.
PCI 66. This bit reflects the current state of the PCI 66 switch. A cleared
condition indicates the switch is off. A set condition indicates the switch is on.
MASTER WP. This bit reflects the current state of the MASTER WP switch.
A cleared condition indicates the switch is off. A set condition indicates the
switch is on. When this switch is on, the NOR FLASH, NAND FLASH, MRAM
and I2C EEPROMs are write protected. When this switch is off, NOR FLASH,
NAND FLASH, MRAM and I2C EEPROMs are not write protected by this
function. This switch does not write protect the SPD on the SO-CDIMM.
Other switches and control bits may write protect individual devices.
SW8. This bit reflects the current state of SW8. A cleared condition indicates
the switch is off. A set condition indicates the switch is on.
System Control Register
System Control Register - 0xF200 0001
7 6 5
BRD_RST
R/W
0 0 0
4 3 2
RSVD RSVD RSVD
R R R
0 0 0
Register Descriptions
1 0
EEPROM_ RSVD
WP
R/W R
1 0
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