FOXBORO FBM202 P0926EQ傳感器
啟用看門狗定時(shí)器后，應(yīng)用程序軟件必須在選定的超時(shí)時(shí)間內(nèi)刷新看門狗定時(shí)器，以防止生成重置或SERR#。通過對(duì)WDT?；罴拇嫫鳎╓KPA）執(zhí)行寫入來刷新看門狗定時(shí)器。寫入的數(shù)據(jù)無關(guān)緊要。WDT?；罴拇嫫鳎╓KPA）啟用后，通過在所選超時(shí)時(shí)間段內(nèi)寫入位于BAR2中地址偏移0x0C處的WDT保命寄存器（WKBA），防止看門狗定時(shí)器重置系統(tǒng)。寫入此位置的數(shù)據(jù)不相關(guān)。NVSRAM VMIVME-7750提供32KB的非易失性SRAM。該存儲(chǔ)器被映射到從BAR1中的地址開始的32K地址空間中。該內(nèi)存隨時(shí)可用，支持從PCI總線進(jìn)行字節(jié)、短字和長(zhǎng)字訪問。當(dāng)板的電源斷開時(shí)，此內(nèi)存的內(nèi)容將保留。
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.
