MVME133XT VMEbus模块是一款基于VMEbus标准的处理器模块，其特点如下：

1. 微处理器与协处理器：
   • MVME133XT集成了MC68020微处理器，这是一款32位地址和数据的处理器，其运行频率可能包括12.5 MHz（MVME133）或16.67 MHz（MVME133-1）的版本。
   • 同时，该模块还包含MC68881浮点协处理器，提供浮点运算支持，其运行频率与主处理器相匹配。
2. 内存配置：
   • 配备1Mb共享本地动态RAM（DRAM），数据宽度为32位，可从VMEbus访问。
3. 扩展插槽：
   • 四个28针JEDEC插槽，用于ROM/PROMs/EPROM/EEPROM，这些插槽分为两组，每组16位宽，总计最大支持256Kb。
4. 定时器与实时时钟：
   • 包含三个8位可编程定时器，用于滴答和看门狗功能。
   • 每日时钟/日历时间（实时时钟），如MM58274A，提供日期和时间功能。
5. 串行通信接口：
   • 前面板异步DB25串行调试RS-232C端口，基于MC68901 MFP。
   • 双多协议（同步/异步）串行端口（Z8530），包括RS-232C（端口B）和RS-485/RS-422（端口A）。
6. VMEbus接口与系统控制：
   • 支持VMEbus标准，包括A24/D32（A24/D16兼容）VMEbus主机功能。
   • 具有三级仲裁器的VMEbus系统控制器功能，以及单级总线请求器（可选择级跳线）。
   • 提供VMEbus断续器和所有七个级别的VMEbus中断处理程序。

MVME133XT

The MVME133XT VMEbus module is a processor module based on the VMEbus standard, with the following characteristics:

Microprocessors and Coprocessors:
The MVME133XT integrates the MC68020 microprocessor, which is a 32-bit address and data processor that may run at frequencies including 12.5 MHz (MVME133) or 16.67 MHz (MVME133-1) versions.
At the same time, the module also includes the MC68881 floating-point coprocessor, which provides floating-point operation support and its running frequency matches that of the main processor.
Memory configuration:
Equipped with 1Mb shared local dynamic RAM (DRAM), with a data width of 32 bits, accessible from VMEbus.
Expansion slots:
Four 28 pin JEDEC slots are used for ROM/PROMs/EPROM/EEPROM. These slots are divided into two groups, each 16 bit wide, and support a maximum of 256Kb in total.
Timer and real-time clock:
Includes three 8-bit programmable timers for tick and watchdog functions.
Daily clock/calendar time (real-time clock), such as MM58274A, provides date and time functionality.
Serial communication interface:
Front panel asynchronous DB25 serial debugging RS-232C port, based on MC68901 MFP.
Dual multi protocol (synchronous/asynchronous) serial port (Z8530), including RS-232C (port B) and RS-485/RS-422 (port A).
VMEbus interface and system control:
Supports VMEbus standard, including A24/D32 (A24/D16 compatible) VMEbus host functionality.
A VMEbus system controller with a three-level arbitrator function, as well as a single-stage bus requester (with optional stage jumpers).
Provide VMEbus interrupters and all seven levels of VMEbus interrupt handlers.

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