IS230SRTDH2A处理器燃机卡，GE使用参数

这减少了SCSI设备对本地总线的使用。参考MCchipMVME162嵌入式控制器中的编程模型参考指南。在奇偶校验关闭的情况下，DMA控制器在25 MHz时的传输速率为44MB/s以及交错的DRAM和读取周期。假设连续传输速率SCSI总线上的带宽为5MB/s，本地总线带宽的12%用于从SCSI总线传输。LAN DMA传输MVME162包括与DMA控制器的LAN接口。

IS230SRTDH2A处理器燃机卡局域网DMA控制器使用FIFO缓冲器将串行LAN总线连接到32位本地总线公共汽车FIFO缓冲区允许LAN DMA控制器有效传输数据数据传输到本地总线。82596CA不执行MC68040兼容的突发周期，因此LAN DMA控制器不使用突发传输。奇偶校验DRAM写入周期需要3个时钟周期，读取周期需要5个时钟周期，奇偶校验关闭和奇偶校验开启的6个时钟周期。LAN DMA控制器的传输速率在25 MHz时为20MB/s奇偶校验关闭。假设LAN总线上的连续传输速率为1MB/s，本地总线带宽的5%用于LAN总线的传输。远程状态和控制远程状态和控制连接器J4是一个20针连接器，位于MVME162前面板后面。它为系统设计者提供了访问关键指示器和重置功能的灵活性。这允许系统设计师将构建一个可定位的重置/中止/LED面板从MVME162远程。介绍如本手册前几章所述，MVME162的两个串行端口（内部端口A，前面板上的串行端口1/控制台）为EIA-232-D DCE端口专用。第二个端口（端口B内部，串行前面板上的端口2）可以通过串行接口模块配置为EIA-232-D DCE/DTE或EIA-530 DCE/DTE端口。MVME162使用Zilog Z85230串行端口控制器来实现这两个功能串行通信接口。每个接口支持CT、DCD、RTS、，和DTR控制信号以及TxD和RxD发送/接收数据信号和TxC/RxC同步时钟信号。Z85230支持同步（SDLC/HDLC）和异步协议。MVME162硬件支持110B/s到38.4KB/s的异步串行波特率。

This reduces local bus usage by the SCSI device. Refer to the MCchip

Programming Model in the MVME162 Embedded Controller Programmer’s

Reference Guide.

The transfer rate of the DMA controller is 44MB/sec at 25 MHz with parity off

and interleaved DRAM and read cycles. Assuming a continuous transfer rate

of 5MB/sec on the SCSI bus, 12% of the local bus bandwidth is used by

transfers from the SCSI bus.

LAN DMA Transfers

The MVME162 includes a LAN interface with DMA controller. The LAN DMA

controller uses a FIFO buffer to interface the serial LAN bus to the 32-bit local

bus. The FIFO buffer allows the LAN DMA controller to efficiently transfer

data to the local bus.

The 82596CA does not execute MC68040 compatible burst cycles, therefore the

LAN DMA controller does not use burst transfers. Parity DRAM write cycles

require 3 clock cycles, and read cycles require 5 clock cycles with parity off and

6 clock cycles with parity on.

The transfer rate of the LAN DMA controller is 20MB/sec at 25 MHz with

parity off. Assuming a continuous transfer rate of 1MB/sec on the LAN bus,

5% of the local bus bandwidth is used by transfers from the LAN bus.

Remote Status and Control

The remote status and control connector, J4, is a 20-pin connector located

behind the front panel of the MVME162. It provides system designers with

flexibility in accessing critical indicator and reset functions. This allows a

system designer to construct a RESET/ABORT/LED panel that can be located

remotely from the MVME162.Introduction

As described in previous chapters of this manual, one of the MVME162’s two

serial ports (port A internally, SERIAL PORT 1/CONSOLE on the front panel) is

an EIA-232-D DCE port exclusively. The second port (port B internally, SERIAL

PORT 2 on the front panel) can be configured via serial interface modules as an

EIA-232-D DCE/DTE or EIA-530 DCE/DTE port.

The MVME162 uses a Zilog Z85230 serial port controller to implement the two

serial communications interfaces. Each interface supports CTS, DCD, RTS,

and DTR control signals as well as the TxD and RxD transmit/receive data

signals, and TxC/RxC synchronous clock signals. The Z85230 supports

synchronous (SDLC/HDLC) and asynchronous protocols. The MVME162

hardware supports asynchronous serial baud rates of 110B/sec to 38.4KB/sec.