FOXBORO E69F-BI2压力变送器
在NMI中断例程处理中断后，软件通过将相应的启用/禁用位设置为1来清除NMI状态位。NMI启用和实时时钟寄存器可以屏蔽NMI信号并禁用/启用所有NMI源。集成外围设备VMIVME-7750包含国家半导体超级I/O（SIO）芯片。SIO为VMIVME-7750提供标准软盘驱动器控制器、两个16550 UART兼容串行端口、键盘和鼠标端口以及用于系统监控功能的通用I/O。两个串行端口信号均可从前面板获得。软盘信号可通过VME背板连接器获得，并可通过适当的转换实用程序板（VMIACC-0562）访问。IDE接口由Intel I/O控制器集线器（ICH2）芯片提供。IDE接口支持两个通道，即主通道和辅助通道。辅助通道在板上路由到可选的小型闪存插座。主通道从VME背板引出至VMIACC-0562过渡实用板，该板终止于标准的40针插头。该通道可以支持两个驱动器，一个主驱动器和一个从驱动器。
After the NMI interrupt routine processes the interrupt, software clears
the NMI status bits by setting the corresponding enable/disable bit to 1. The NMI
Enable and Real-Time Clock register can mask the NMI signal and disable/enable all
NMI sources.ntegrated Peripherals
The VMIVME-7750 incorporates a National Semiconductor Super I/O (SIO) chip.
The SIO provides the VMIVME-7750 with a standard floppy drive controller, two
16550 UART-compatible serial ports, keyboard and mouse ports and general purpose
I/O for system monitoring functions. Both serial port signals are available from the
front panel. The floppy signals are available via the VME backplane connectors and
can be accessed with the appropriate transition utility board (VMIACC-0562).
The IDE interface is provided by the Intel I/O Controller Hub (ICH2) chip. The IDE
interface supports two channels known as the primary and secondary channels. The
secondary channel is routed on-board to the optional compact flash socket. The
primary channel is routed out the VME backplane to a VMIACC-0562 transition
utility board which terminates into a standard 40-pin header. This channel can
support two drives, a master and slave.
