EMERSON 5X00321G01 DCS卡
每种设备类型的访问定时都是可编程的，取决于初始化期间VPD中的设备定时数据。MVME7100上提供了硬件闪存组写保护开关，以启用NOR闪存的写保护。无论NOR闪存控制/状态寄存器中的软件闪存写保护位的状态如何，当该开关处于ON时，写保护都会启用。当该开关为OFF时，写防护由软件闪存写防护位的状态控制，并且只能通过清除NOR闪存控制/状态寄存器的该位来禁用。请注意，F_WE_HW位反映交换机的状态，并且仅是软件可读的，而F_WP_SW位同时支持读和写操作。MVME7100提供了一个双引导选项，用于从引导闪存库中的两个单独的引导映像（称为引导块a和引导块B）中的一个引导。引导块a、B的大小各为1MB，位于引导闪存空间的顶部（最高地址）2MB。
Access timing for each device type is programmable and depends on the device timing data found in the VPD during initialization.A hardware flash bank write protect switch is provided on the MVME7100 to enable write protection of the NOR Flash. Regardless of the state of the software flash write protect bit in the NOR Flash Control/Status register, write protection is enabled when this switch is ON. When this switch is OFF, write protection is controlled by the state of the software flash write protect bits and can only be disabled by clearing this bit in the NOR Flash Control/Status register. Note that the F_WE_HW bit reflects the state of the switch and is only software readable whereas the F_WP_SW bit supports both read and write operations. The MVME7100 provides a dual boot option for booting from one of two separate boot images in the boot flash bank which are referred to as boot block A and boot block B. Boot blocks A and B are each 1MB in size and are located at the top (highest address) 2MB of the boot flash memory space.
