Functional Description
MVME8100 / MVME8110 Installation and Use (6806800P25J
)
90
The OS Watchdog (OSWD) is used to guard loading of the operating system. The OS has to
service OSWD before timeout or OSWD will request a hard reset sequence to reset the board.
The configuration switch S2-1 is used to enable or disable both watchdogs. By default, the
watchdogs are disabled.
4.4.3.1
Initial Hardware Watchdog
Initial Hardware Watchdog (IWD) starts after reset deassertion. This watchdog has to be
serviced within 8s after a reset deassertion, otherwise a IWD reset will be requested.
The Initial Hardware Watchdog is serviced by writing 0xEEA1 to CPLD Command/Status
Register.
4.4.3.2
OS Watchdog
The OS Watchdog (OSWD) is not armed after reset. It is enabled right after the IWD is disabled.
The OSWD timeout is set to 108s. If the timer terminates, the OSWD reset sequence will be
initiated.
OSWD is serviced and disabled by writing 0xBBC2 to CPLD Command/Status Register.
4.4.4
CPLD Tick Timer
The MVME8100 supports four independent 32-bit timers that are implemented on the CPLD
to provide fully programmable registers for the timers.
4.5
Ethernet Interfaces
The P5020 / P5010 has five dTSEC controllers. The controllers can be configured to implement
RGMII, GMII, or SGMII interfaces to external Ethernet transceivers.
If IWD is not serviced after switching over to the SPI1 U-Boot Flash, board will infinitely try to
boot to SPI1 U-Boot Flash.
By default, U-Boot will disable both the IWD and the OSWD.
Summary of Contents for MVME8100
Page 1: ...MVME8100 MVME8110 Installation and Use P N 6806800P25J August 2015 ...
Page 8: ...MVME8100 MVME8110 Installation and Use 6806800P25J 8 List of Tables ...
Page 10: ...MVME8100 MVME8110 Installation and Use 6806800P25J 10 List of Figures ...
Page 26: ...MVME8100 MVME8110 Installation and Use 6806800P25J Sicherheitshinweise 26 ...
Page 58: ...Hardware Preparation and Installation MVME8100 MVME8110 Installation and Use 6806800P25J 58 ...
Page 84: ...Connectors LEDs and Switches MVME8100 MVME8110 Installation and Use 6806800P25J 84 ...
Page 108: ...Functional Description MVME8100 MVME8110 Installation and Use 6806800P25J 108 ...
Page 122: ...Related Documentation MVME8100 MVME8110 Installation and Use 6806800P25J 122 ...
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