5X00062G01模块，EMERSON配置教程

并行端口接口PCCchip2提供8位双向并行端口。全部的端口的八位必须是输入或输出（没有单独的选择）。除了8位数据外，还有两个控制引脚和五个状态引脚。每个状态引脚都可以生成一个中断PCCCip2提供了与MVME147 PCC。在自动选通模式下，写入打印机后数据寄存器，PCCCIP2自动断言选通*引脚打印机快速选通控制位指定的选定时间。

5X00062G01模块，EMERSON配置教程在里面手动模式下，打印机选通控制位直接控制选通*引脚的状态。有关详细信息，请参阅单板计算机程序员参考指南打印机端口接口连接的图纸。以太网接口82596CA用于实现以太网收发器界面82596CA使用DMA操作访问本地RAM执行其正常功能。因为82596CA的内部缓冲区和VMEbus具有未定义的延迟期，如果DMA编程为访问VMEbus。因此，82596CA不应编程为访问VMEbus。每个MVME177都分配了一个以太网站地址。这个地址是$08003E2xxxxx，其中xxxxx是唯一的5位字节分配给电路板的编号（即，每个MVME177具有不同的xxxxx的值）。每个模块都有一个标签上显示的以太网站地址连接到VMEbus P2连接器。此外，六个字节包括以太网地址存储在配置区域中BBRAM的。也就是说，08003E2xxxxx存储在BBRAM中。在地址为$FFFC1F2C，可以读取上面的四个字节（08003E2x）。在地址为$FFFC1F30时，可以读取较低的两个字节（xxxx）。请参阅中的BBRAM、TOD时钟内存映射描述第3章。MVME177调试器能够检索或设置以太网地址。如果BBRAM中的数据丢失，用户应使用恢复VMEbus P2连接器标签。以太网收发器接口位于MVME177主机上工业标准连接器位于MVME712x过渡模块。82596CA的支持功能由PCCCIP2提供。请参阅82596CA用户指南和单板计算机详细编程的程序员参考指南

Parallel Port Interface

The PCCchip2 provides an 8-bit bidirectional parallel port. All

eight bits of the port must be either inputs or outputs (no individual

selection). In addition to the 8 bits of data, there are two control pins

and five status pins. Each of the status pins can generate an

interruptThe PCCchip2 provides an auto-strobe feature similar to that of the

MVME147 PCC. In auto-strobe mode, after a write to the Printer

Data Register, the PCCchip2 automatically asserts the STROBE* pin

for a selected time specified by the Printer Fast Strobe control bit. In

manual mode, the Printer Strobe control bit directly controls the

state of the STROBE* pin. Refer to the Single Board Computers Programmer's Reference Guide for

drawings of the printer port interface connections.

Ethernet Interface

The 82596CA is used to implement the Ethernet transceiver

interface. The 82596CA accesses local RAM using DMA operations

to perform its normal functions. Because the 82596CA has small

internal buffers and the VMEbus has an undefined latency period,

buffer overrun may occur if the DMA is programmed to access the

VMEbus. Therefore, the 82596CA should not be programmed to

access the VMEbus.

Every MVME177 is assigned an Ethernet Station Address. The

address is $08003E2xxxxx, where xxxxx is the unique 5-nibble

number assigned to the board (i.e., every MVME177 has a different

value for xxxxx).

Each module has an Ethernet Station Address displayed on a label

attached to the VMEbus P2 connector. In addition, the six bytes

including the Ethernet address are stored in the configuration area

of the BBRAM. That is, 08003E2xxxxx is stored in the BBRAM. At an

address of $FFFC1F2C, the upper four bytes (08003E2x) can be read.

At an address of $FFFC1F30, the lower two bytes (xxxx) can be read.

Refer to the BBRAM, TOD Clock memory map description in

Chapter 3. The MVME177 debugger has the capability to retrieve or

set the Ethernet address.

If the data in the BBRAM is lost, the user should use the number on

the VMEbus P2 connector label to restore it.

The Ethernet transceiver interface is located on the MVME177 main

module, and the industry standard connector is located on the

MVME712x transition module.

Support functions for the 82596CA are provided by the PCCchip2.

Refer to the 82596CA user's guide and to the Single Board Computers

Programmer's Reference Guide for detailed programming

information