BENTLY 330108-91-05模块本章提供了以下方面的框图级描述：MVME177模块。功能描述提供了模块概述，然后详细描述模块的几个模块。MVME177的框图如第4-3页图4-1所示。MVME177其他模块的说明，包括ASIC和外围芯片中的可编程寄存器是在单板计算机程序员参考指南中给出。有关MVME177的其余功能描述
BENTLY 330108-91-05模块请参阅单元MVME177功能描述MVME177是一种高功能VMEbus单板围绕MC68060芯片设计的计算机。MVME177具有：❏ 4/8/16/32/64/128/256MB动态RAM❏ SCSI大容量存储接口❏ 四个串行端口❏ 一个并行端口❏ 以太网收发器接口数据总线结构MVME177上的本地数据总线是32位同步总线它基于MC68060总线，支持突发传输和窥探。各种本地总线主设备和从设备使用本地总线进行通信。本地总线由优先级仲裁类型仲裁器和本地总线主节点的优先级从高到低最低为：❏ 82596CA局域网CD2401串行（通过PCCCip2）❏ 53C710 SCSI❏ VME总线 微处理器在一般情况下，任何主机都可以访问任何从机；但是，不是所有组合都通过常识测试。参考单个板机程序员参考指南和用户的每个设备的确定指南：❏ 端口大小❏ 数据总线连接❏ 访问设备时适用的任何限制
Introduction
This chapter provides a block diagram level description for the
MVME177 module. The functional description provides an
overview of the module, followed by a detailed description of
several blocks of the module. The block diagram of the MVME177
is shown in Figure 4-1 on page 4-3.
Descriptions of the other blocks of the MVME177, including
programmable registers in the ASICs and peripheral chips, are
given in the Single Board Computers Programmer's Reference Guide.
Refer to it for the rest of the functional description of the MVME177
module.
MVME177 Functional Description
The MVME177 is a high functionality VMEbus single board
computer designed around the MC68060 chip. The MVME177 has:
❏ 4/8/16/32/64/128/256MB of dynamic RAM
❏ SCSI mass storage interface
❏ Four serial ports
❏ One parallel port
❏ Ethernet transceiver interface
Data Bus Structure
The local data bus on the MVME177 is a 32-bit synchronous bus
that is based on the MC68060 bus, and supports burst transfers and
snooping. The various local bus master and slave devices use the local bus to communicate. The local bus is arbitrated by priority
type arbiter and the priority of the local bus masters from highest to
lowest is:
❏ 82596CA LAN
❏ CD2401 serial (through the PCCchip2)
❏ 53C710 SCSI
❏ VMEbus
❏ MPU
In the general case, any master can access any slave; however, not
all combinations pass the common sense test. Refer to the Single
Board Computers Programmer's Reference Guide and to the user's
guide for each device to determine:
❏ Port size
❏ Data bus connection
❏ Any restrictions that apply when accessing the device
