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Resets
2-9
10003794-05
2.4 Resets
The PmPPC440 has several sources for resets. The power-on sequence, the front
panel reset switch, and a PCI reset all perform a hard reset to the entire board.
Also, a software-controlled Reset Command register at C100,0008
16
allows for
various types of resets, as follows:
After being written to, the Reset Command register bits clear automatically. The
Hard Reset Command is disabled if the QS_QE bit is active (see Register Map 2-2).
When the PCI Reset Command is active, it prevents a PCI reset from affecting the
board.
The Quick Switch Enable register at C100,0034
16
provides for two reset modes.
When bit zero is active (enabled), the PCI Reset signal connects to the PPC440GP
processor’s SYS_RESET pin. When this bit is not active (disabled), the PmPPC440’s
programmable logic device (PLD) drives the SYS_RESET pin. The reset value for
the QS_QE bit is one (enabled).
3
2
1
0
PCI
Ethernet
Flash
Hard
Register Map 2-1. Configuration Command
PCI
PCI Reset Command. Writing a one to this bit asserts the ResetOut signal
on the PCI interface. The reset value is zero.
Ethernet
Ethernet Reset Command. Writing a one to this bit causes an Ethernet
reset. The reset value is zero.
Flash
Flash Reset Command. Writing a one to this bit causes a Flash reset. The
reset value is zero.
Hard
Hard Reset Command. Writing a one to this bit causes a hard reset to the
board. The reset value is zero.
3
2
1
0
reserved
QS_QE
Register Map 2-2. Quick Switch Enable
Summary of Contents for PmPPC440
Page 1: ...PmPPC440 PowerPC Based Processor PMC Module User s Manual April 2005 ...
Page 3: ...PmPPC440 PowerPC Based Processor PMC Module User s Manual April 2005 ...
Page 14: ...viii PmPPC440 Contents ...
Page 34: ...2 14 PmPPC440 Setup April 2005 ...
Page 42: ...3 8 PmPPC440 PPC440GP Processor April 2005 ...
Page 56: ...6 4 PmPPC440 Ethernet Interface April 2005 ...