FOXBORO FBM202 P0926EQ传感器
启用看门狗定时器后，应用程序软件必须在选定的超时时间内刷新看门狗定时器，以防止生成重置或SERR#。通过对WDT保活寄存器（WKPA）执行写入来刷新看门狗定时器。写入的数据无关紧要。WDT保活寄存器（WKPA）启用后，通过在所选超时时间段内写入位于BAR2中地址偏移0x0C处的WDT保命寄存器（WKBA），防止看门狗定时器重置系统。写入此位置的数据不相关。NVSRAM VMIVME-7750提供32KB的非易失性SRAM。该存储器被映射到从BAR1中的地址开始的32K地址空间中。该内存随时可用，支持从PCI总线进行字节、短字和长字访问。当板的电源断开时，此内存的内容将保留。
Once the Watchdog Timer is enabled,
the application software must refresh the Watchdog Timer within the selected timeout
period to prevent a reset or SERR# from being generated. The Watchdog Timer is
refreshed by performing a write to the WDT Keepalive register (WKPA). The data
written is irrelevant.
WDT Keepalive Register (WKPA)
When enabled, the Watchdog Timer is prevented from resetting the system by writing
to the WDT Keepalive Register (WKPA) located at offset 0x0C from the address in
BAR2 within the selected timeout period. The data written to this location is
irrelevant.NVSRAM
The VMIVME-7750 provides 32KBytes of non-volatile SRAM. This memory is
mapped in 32K of address space starting at the address in BAR1. This memory is
available at any time and supports byte, short word and long word accesses from the
PCI bus. The contents of this memory is retained when the power to the board is
removed.
