PCD232 3BHE022293R0101 GFD563A101 3BHE046836R0101系统处理器模块3BHB017655R0001 3BHB004719R0001 3BHB002001R0012 3BHB002229R0001 3BHB015129R0003 3BHB015129R0003基于10BaseT标准的网络使用非屏蔽双绞线，通过允许使用现有的电话接线和连接器。RJ-45连接器与10BaseT一起使用标准10BaseT从接线毂到终端节点。VMIVME-7698还支持100BaseTx以太网。基于100BaseTx标准使用非屏蔽双绞线和RJ-45连接器。这个100BaseTx的最大部署长度为250米。
VMIVME-7698以太网控制器支持使用LANWorks进行远程引导以太网BIOS。有关远程以太网的更多信息，请参阅附录C引导。VMIC的VMIVME-7698具有典型IBM之外的其他功能PC/AT兼容CPU。该装置提供三个软件控制，通用定时器和可编程看门狗定时器在嵌入式应用程序中同步和控制多个事件。这个VMIVME-7698还提供了一个可引导的闪存系统和32K字节的非易失性、电池供电的SRAM。这些特性使该装置成为嵌入式系统的理想选择应用程序，尤其是标准硬盘和软盘的应用程序无法使用驱动器。VMIVME-7698提供了一个用户可编程的82C54内部定时器/计数器。这个82C54提供三个独立的16位计时器，每个计时器在1或2 MHz时钟下工作速度由跳线E8的配置决定；参考第32页的表2-2。这些计时器完全可供用户使用，不专用于任何PC/AT作用这些定时器可用于产生系统中断。事件可以通过轮询计时器或通过生成系统中断来计时82C54外部电路。外部电路由产生中断和定时器中断状态寄存器，指示三者中的哪一个定时器产生中断。82C54定时器映射到输入/输出地址$500。定时器使用的中断是IRQ5。定时器中断状态寄存器可通过电源管理获得输入/输出地址空间。“计时器中断”中解释了对该空间的访问下面的“状态”部分A network based on the 10BaseT standard uses unshielded twisted-pair cables,
providing an economical solution to networking by allowing the use of existing
telephone wiring and connectors. The RJ-45 connector is used with the 10BaseT
standard. 10BaseT has a maximum length of 100 m from the wiring hub to the
terminal node. The VMIVME-7698 also supports the 100BaseTx Ethernet. A network based on a
100BaseTx standard uses unshielded twisted-pair cables and a RJ-45 connector. The
100BaseTx has a maximum deployment length of 250 m.The VMIVME-7698 ethernet controller supports remote booting using the LANWorks
Ethernet BIOS. Refer to Appendix C for more information on remote Ethernet
booting.VMIC’s VMIVME-7698 features additional capabilities beyond those of a typical IBM
PC/AT-compatible CPU. The unit provides three software-controlled,
general-purpose timers along with a programmable Watchdog timer for
synchronizing and controlling multiple events in embedded applications. The
VMIVME-7698 also provides a bootable flash disk system and 32 K byte of
nonvolatile, battery-backed SRAM. These features make the unit ideal for embedded
applications, particularly applications where standard hard drives and floppy disk
drives cannot be used.The VMIVME-7698 provides a user-programmable 82C54 internal timer/counter. The
82C54 provides three independent, 16-bit timers, each operating at 1 or 2 MHz clock
speed determined by the configuration of jumper E8; reference Table 2-2 on page 32.
These timers are completely available to the user and are not dedicated to any PC/AT
function. These timers may be used to generate system interrupts.
Events can be timed by either polling the timers or generating a system interrupt via
circuity external to the 82C54. The external circuity consists of logic which generates
the interrupt and a Timer Interrupt Status register which indicates which of the three
Timers generated an interrupt.
The 82C54 timers are mapped at I/O address $500. The interrupt used by the Timers
is IRQ5. The Timer Interrupt Status register is available via the Power Management
I/O address space. The access to this space is explained in the “Timer Interrupt
Status” section below
