GJR5253300R1161模块控制器
则访问超时并由TEA信号终止。5.尺寸近似。6.到82596CA的端口命令必须写为两个16位写入：高位字第一和低位字第二。7.请参阅《MVME162FX嵌入式控制器程序员参考指南》中MC2芯片描述中的闪存和PROM接口部分。VMEbus内存映射本节描述VMEbus主控器查看的本地资源映射。ENV命令提供从属、主和GCSR地址解码器的默认地址。请参阅附录A。VMEbus访问本地总线VMEcchip2包括用于VMEbus到本地总线接口的用户可编程映射解码器。映射解码器允许您编程开始和结束地址以及控制器响应的修改器。VMEbus短I/O内存映射VMEchip2包括用于GCSR的用户可编程映射解码器。GCSR映射解码器允许您在VMEbus短I/O空间中编程GCSR的起始地址。1-36计算机组文献中心网站板级硬件说明1软件初始化使用其他模块上的开关或跳线完成的大多数功能都是通过在MVME162FX嵌入式控制器上设置控制寄存器来完成的。在加电或复位时，包含162Bug调试包的EPROM设置了许多这些寄存器的默认值。具体编程细节可参考M68040微处理器用户手册确定。然后检查MVME162FX嵌入式控制器编程器参考指南中给出的所有控制器板载寄存器的详细信息。多MPU编程注意事项良好的编程实践表明，一次只能有一个MPU控制MVME162FX的控制寄存器。特别值得注意的是：❏ 修改地址映射的寄存器❏ 需要两个周期才能访问的寄存器❏ VME总线中断请求寄存器本地复位操作本地复位（LRST）是系统复位（SRST）的一个子集。可通过五种方式生成本地重置：❏ 看门狗定时器到期❏ 按下前面板复位开关（如果系统控制器功能被禁用）❏ 通过在GCSR的板控制寄存器中声明一位❏ 通过SYSRESET*❏ 通过加电复位软件初始化http://www.mcg.mot.com/literature1-37 1注意：GCSR允许VMEbus主设备重置本地总线。此功能非常危险，应谨慎使用。本地复位功能是部分系统复位，而不是完全系统复位，如加电复位或SYSRESET*。当本地总线复位信号被断言时，可以中止本地总线周期。VMEchip2连接到本地总线和VMEbus，如果VMEbus绑定了中止的周期，可能会导致不稳定的操作。本地处理器和VMEbus主机之间的通信应使用中断或邮箱位置；重置不应用于正常通信。只有当本地处理器停止或本地总线挂起且重置是最后的手段时，才应使用重置。当控制器处于重置状态时，将忽略对控制器的任何VMEbus访问。如果启用了全局总线计时器，则会生成总线错误。1-38计算机组文献中心网站板级硬件说明1 2-1 2硬件准备和安装简介本章提供了有关MVME162FX嵌入式控制器硬件准备和硬件安装的信息。这包括拆包程序、跳线配置和安装说明。MVME712系列转换模块的硬件准备在单独的手册中提供。请参阅附录F中的相关文档部分。启动程序概述。下表概述了构成MVME162FX控制器启动程序的任务。它（按顺序）列出了在使用硬件之前需要执行的任务。此外，表的右栏为您提供了页面
er is enabled, the access times out and is terminated by a TEA signal. 5. Size is approximate. 6. Port commands to the 82596CA must be written as two 16-bit writes: upper word first and lower word second. 7. Refer to the flash and PROM Interface section in the MC2 chip description in the MVME162FX Embedded Controller Programmer’s Reference Guide. VMEbus Memory Map This section describes the mapping of local resources as viewed by VMEbus masters. Default addresses for the slave, master, and GCSR address decoders are provided by the ENV command. Refer to Appendix A. VMEbus Accesses to the Local Bus The VMEchip2 includes a user-programmable map decoder for the VMEbus to local bus interface. The map decoder allows you to program the starting and ending address and the modifiers the controller responds to. VMEbus Short I/O Memory Map The VMEchip2 includes a user-programmable map decoder for the GCSR. The GCSR map decoder allows you to program the starting address of the GCSR in the VMEbus short I/O space. 1-36 Computer Group Literature Center Web Site Board Level Hardware Description 1 Software Initialization Most functions that have been done with switches or jumpers on other modules are done by setting control registers on the MVME162FX Embedded Controller. At power-up or reset, the EPROMs that contain the 162Bug debugging package set up the default values of many of these registers. Specific programming details may be determined by referencing the M68040 Microprocessor User’s Manual. Then check the details of all the controller’s onboard registers as given in the MVME162FX Embedded Controller Programmer’s Reference Guide. Multi-MPU Programming Considerations Good programming practice dictates that only one MPU at a time have control of the MVME162FX’s control registers. Of particular note are: ❏ Registers that modify the address map ❏ Registers that require two cycles to access ❏ VMEbus interrupt request registers Local Reset Operation Local reset (LRST) is a subset of system reset (SRST). Local reset can be generated five ways: ❏ Expiration of the watchdog timer ❏ Pressing the front panel RESET switch (if the system controller function is disabled) ❏ By asserting a bit in the board control register in the GCSR ❏ By SYSRESET* ❏ By power-up reset Software Initialization http://www.mcg.mot.com/literature 1-37 1 Note The GCSR allows a VMEbus master to reset the local bus. This feature is very dangerous and should be used with caution. The local reset feature is a partial system reset, not a complete system reset such as power-up reset or SYSRESET*. When the local bus reset signal is asserted, a local bus cycle may be aborted. The VMEchip2 is connected to both the local bus and the VMEbus and if the aborted cycle is bound for the VMEbus, erratic operation may result. Communications between the local processor and a VMEbus master should use interrupts or mailbox locations; reset should not be used in normal communications. Reset should be used only when the local processor is halted or the local bus is hung and reset is the last resort. Any VMEbus access to the controller while it is in the reset state is ignored. If a global bus timer is enabled, a bus error is generated. 1-38 Computer Group Literature Center Web Site Board Level Hardware Description 1 2-1 2 2Hardware Preparation and Installation Introduction This chapter provides information on hardware preparation and installation for the MVME162FX Embedded Controller. This includes unpacking procedures, jumper configuration, and installation instructions. Hardware preparation for the MVME712 series transition modules is provided in separate manuals. Refer to the Related Documentation section in Appendix F. Overview of Startup Procedure The table shown below provides an overview of the tasks that comprise the startup procedure for the MVME162FX Controller. It lists (sequentially) the tasks that you will need to perform before you can use the hardware. Additionally, the right column of the table provides you with the page
