IC698CPE040燃机电气卡件，GE实验数据

调试器执行您输入的命令后，提示重新出现。但是，如果该命令导致执行用户目标代码（例如GO），则控制可能返回或不返回调试器，取决于用户程序的功能。例如，如果指定了断点，则控制返回到在用户执行期间遇到断点时的调试器程序或者，用户程序可以通过以下方式返回调试器：系统调用处理程序例程返回的方式（在摩托罗拉68K CISC CPU用户手册调试包，第5章）。调试器命令由以下部分组成：❏ 命令名，大写或小写（例如，MD或md）。

IC698CPE040燃机电气卡件❏ 端口号（如果命令设置为与多个端口一起工作端口）。❏ 命令指定的任何必需参数。❏ 第一个参数前至少有一个空格。优先于所有其他带有空格或逗号的参数。您可以使用工厂安装的调试监视器172Bug来修改MVME172LX非易失性RAM中包含的某些参数（NVRAM），也称为电池备份RAM（BBRAM）。❏ NVRAM中的板信息块包含各种与硬件操作参数有关的元素。使用172Bug命令CNFG更改这些参数。❏ 使用172Bug命令ENV更改可配置的172BugNVRAM中的参数。调试中描述了CNFG和ENV命令摩托罗拉68K CISC CPU用户手册包。请参阅有关其使用和功能的一般信息的手册。以下段落提供了关于CNFG的补充信息和特定于172Bug调试器的ENV，以及可以使用ENV命令配置的参数。CNFG-配置电路板信息块使用此命令显示和配置电路板信息块它位于NVRAM内。电路板信息块包含对应于特定操作的各种元素MVME172LX板的参数。董事会结构MVME172LX如下

After the debugger executes the command you have entered, the prompt

reappears. However, if the command causes execution of user target code

(for example GO), then control may or may not return to the debugger,

depending on what the user program does.

For example, if a breakpoint has been specified, then control returns to the

debugger when the breakpoint is encountered during execution of the user

program. Alternatively, the user program could return to the debugger by

means of the System Call Handler routine RETURN (described in the

Debugging Package for Motorola 68K CISC CPUs User’s Manual,

Chapter 5).

A debugger command is made up of the following parts:

❏ The command name, either uppercase or lowercase (e.g., MD or

md).

❏ A port number (if the command is set up to work with more than one

port).

❏ Any required arguments, as specified by the command.

❏ At least one space before the first argument. Precede all other

arguments with either a space or comma. You can use the factory-installed debug monitor, 172Bug, to modify

certain parameters contained in the MVME172LX’s Non-Volatile RAM

(NVRAM), also known as Battery Backed-Up RAM (BBRAM).

❏ The Board Information Block in NVRAM contains various

elements concerning operating parameters of the hardware. Use the

172Bug command CNFG to change those parameters.

❏ Use the 172Bug command ENV to change configurable 172Bug

parameters in NVRAM.

The CNFG and ENV commands are both described in the Debugging

Package for Motorola 68K CISC CPUs User’s Manual. Refer to that

manual for general information about their use and capabilities.

The following paragraphs present supplementary information on CNFG

and ENV that is specific to the 172Bug debugger, along with the

parameters that can be configured with the ENV command.

CNFG - Configure Board Information Block

Use this command to display and configure the Board Information Block

which is resident within the NVRAM. The board information block

contains various elements that correspond to specific operational

parameters of the MVME172LX board. The board structure for the

MVME172LX is as follows