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MVME340 Vme總線控制器模塊
設置:
*1萬億DRAM
*摩托羅拉MC68020RC20E, 20mhz處理器
*(2) 9針前面板串口
部件編號:01-W3440B13D, 01-W3440B13E, 01-W3440B07C
預計運輸規(guī)模
外形尺寸:263 × 58 × 28mm
重量:.4.3公斤
原產國:美國
在摩托羅拉68020處理器的VAX/VMS上，對三個交叉編譯器進行了評估。為了實時測量系統(tǒng)的響應，我們在一個帶有函數(shù)發(fā)生器和示波器的環(huán)境中，建立了一個由MVME133處理器和MVME340數(shù)字卡組成的VME系統(tǒng)。編譯器提供運行時內核?？梢詫da用于實時應用程序，通過對accept語句的優(yōu)化，任務切換時間可以降低到15 – 20g的量級。
艾達在過去幾年里變化很大。在該語言成為ANS I標準后不久，只有少數(shù)幾個編譯器可用，而且它們只能用來編譯有限的一組程序。我們從嵌套的泛型包和tk類型開始，只是發(fā)現(xiàn)一些經過驗證的編譯器只對測試套件有效。使用這些有限的編譯器的情況是，要花費大量時間找出編譯器在編譯時或運行時失敗的時間和原因。
進化的下一步是用于數(shù)字和數(shù)據(jù)處理程序的生產編譯器。這些編譯器可以取代大多數(shù)現(xiàn)有的Pascal和FORTRAN編譯器。任務分配可以用于中等時間的關鍵應用程序。目標機器仍然與主機相同，例如VAX。一些用戶和公司現(xiàn)在可以開始學習這種語言，并開始開發(fā)工具。
那時，Ada可以在許多應用程序中取代大多數(shù)其他語言。該語言主要是為實時應用特別是嵌入式系統(tǒng)設計的。Ada編譯器的最新發(fā)展是為功能強大的微型計算機(如Motorola 680×0系列、Intel 80X86和National 32X32)提供交叉編譯器。希望將來會有更小的微處理器的編譯器。在一個項目中，為了將Ada軟件分發(fā)到一個松散耦合的多計算系統(tǒng)中，我們將使用三個獨立的VME系統(tǒng)，分別帶有cpu、內存和以太網端口。整個系統(tǒng)將用Ada編程，因此選擇一個支持低級編程并允許有效映射硬件中斷的cpu板和編譯器是必要的。
已經測試的三個交叉編譯器是來自alsysl21的Alsycomp_011，來自Telesoft/TeIeLOGIC的System Designers Ada-Plus版本3A .00 /3/和TeleGen2 /4/。從VAX/VMS到摩托羅拉68000的交叉編譯器沒有在這里測試，可以從Verdix和Tartan獲得。軟件工具和開發(fā)支持
環(huán)境支持對于程序開發(fā)來說已經足夠好了。然而，當硬件和軟件不匹配時，就會出現(xiàn)問題。如果出現(xiàn)虛假中斷，系統(tǒng)可能會掛起，從而無法重新啟動程序，甚至無法進入內核。在加載編譯和鏈接的代碼之前，將內核下載到目標中。當然，也有可能在內核中使用EPROM。在這個評估過程中，下載內核是最方便的。
當在一臺計算機上開發(fā)要在單獨的目標上運行的程序時，環(huán)境是必不可少的。但是，本文中描述的測試不需要y調試。
MVME340 Vme總線控制器模塊
Settings:
*1 trillion DRAM
* MOTOROLA MC68020RC20E,20 MHZ processor
*(2) 9-pin front panel serial port
Part Number(s): 01-W3440B13D, 01-W3440B13E, 01-W3440B07C
Estimated Shipping Size
Dimensions: 263 × 58 × 28mm
Weight:.4.3?kg
Country of Origin: United States of America
Three cross compilers hosted on a VAX/VMS for the Motorola 68020 processor hav e been evaluated . The target machine, a VME system with a MVME133 processor car d and a MVME340 digital i0-card, has been set up in an environment with a function generator and an oscilloscope in order to measure the real time response . The compilers supply the run time kernel . It is possible to use Ada for real time applications , with the use of optimization of accept statements task switch times can come down t o the order of 15 – 20 gs .
Ada has evolved drastically the last years . Soon after the language became an ANS I standard, only a few compilers were available and they could only be used to compil e a limited set of programs . We started out with nested generic packages and tas k types, only to find that some validated compilers were valid only for the test suite . The situation using these limited compilers was to spend a lot of time finding out wher e and why the compiler failed, either at compile or at run time .
The next step in the evolution came with what can be called production compilers for numeric and data handling programs . These compilers could replace most of th e existing Pascal and FORTRAN compilers . Tasking could be used for moderate tim e critical applications . Still the target machines were the same as the host, such as th e VAX . Several users and companies could now start to learn the language and start t o develop tools .
At that time Ada could replace most other languages for many applications . Th e language was primarily designed for real time applications and especially fo r embedded systems . The latest development in Ada compilers are cross compilers fo r quite powerful microcomputers like the Motorola 680X0-family, Intel 80X86 and National 32X32 . Hopefully there will be compilers for smaller micros in the future . In a project, aiming at distributing Ada software to a loosely coupled multi compute r system, three independent VME systems, with cpu, memory and Ethernet port, will b e used/1/ . The whole system will be programmed in Ada and it is therefore essential to choose a cpu-board and a compiler that supports low level programming and allow s an efficient mapping of hardware interrupts .
The three cross compilers that have been tested are the Alsycomp_011 from Alsysl2l , the System Designers Ada-Plus version 3A .00 /3/ and TeleGen2 /4/ fro m Telesoft/TeIeLOGIC . Cross compilers from VAX/VMS to Motorola 68000 not teste d here are available from Verdix and Tartan . Software tools and development support
The environment support is good enough for program development . There are , however, problems when the hardware and software do not match . If spuriou s interrupts occur, the system may hang, making it impossible to restart the program o r even get to the kernel . The kernel was downloaded into the target prior to the loadin g of the compiled and linked code . There is, of course, the possibility to use EPROM s for the kernel . During this evaluation, it was most convenient to download the kernel .
The environment is essential when developing programs on one computer to be run o n a separate target . However, the tests described in this article did not require an y debugging .
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成都陽光不斷創(chuàng)新致力于提升停產的自動化零件供應水平，無論客戶身處何地，無論所需配件多么稀有，我們總能將客戶與所需產品緊密連接 ，成都陽光零部件覆蓋廣泛。
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Company Introduction:
Chengdu Sunshine Xihe Co., Ltd. specializes in one-stop procurement consulting for imported industrial spare parts, offering original equipment and professional discontinued parts services. We are committed to providing efficient and reliable automation solutions for our customers. Customer support fast responseThe network of partners spans all continentsGlobal partner networkAlways achieve more delivery, be it parts, service or speed
始終實現(xiàn)更多的交付，無論是零件、服務還是速度
