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标题: 12bit DAC 测试实例-说明较详细,值得参考! [打印本页]

作者: admin    时间: 2008-9-28 11:25
标题: 12bit DAC 测试实例-说明较详细,值得参考!
12bit DAC 测试实例
The dut is programmed using the ddd card with a three wire serial pattern. All ddd patterns are contained as functions in User.cpp. There are two
methods to program the device. The first method dynamically loads into ddd memory the required pattern based on the dac code desired. The
desired code is passed to the load_pattern() function and only the vectors required for that code are loaded into memory. This method allows the
user to easily load any of the 4096 possible patterns into ddd memory. The drawback to this is that it takes 1mS to run and can only be done from
within a test cycle thereby impacting test time. This method is used only during all codes testing in an engineering environment. The second
method is used for reduced code set testing. All patterns to test the designated reduced code set of this device are pre-loaded into ddd memory
when the test program is loaded. The function used is called pre_load_pattern(). The reduced code set is loaded as follows:
Codes 31 to 48
Codes 4079 to 4095
Codes 64 to 4080 (in steps of 32)
Codes 63 to 4079 (in steps of 32)
Code 0
Code 20
Code 50
In addition there is a pattern used for testing Data Out delay with a special synch bit (ddd chan 5) for capturing the rise and fall edges of Data Out.
The start and stop vectors for all of these codes are stored in memory. Special care should be exercised if any changes are to be made to this code.
Since these start and stop vectors are hard coded, changing any of the patterns will affect them causing improper device operation. If additional
codes need to be tested they should be added on to the end of the sequence so as not to affect the existing ones.


作者: ic_test    时间: 2008-10-7 23:14
经费不足啊,慢慢攒吧。
作者: 客人    时间: 2008-10-24 10:57
!
作者: 客人    时间: 2009-3-25 13:24
今天刚来,发现网站不错,急切注册,怎样挣钱?
作者: ktsf66    时间: 2009-3-26 01:13
thanks
作者: luoying1188    时间: 2009-3-26 11:08
<p>没钱</p>
作者: trillion    时间: 2009-4-1 15:35
<p>w网站刚开始营业,就收这么高的费用,哎!</p>
作者: zhuhongyu76    时间: 2009-5-10 09:22
还是慢慢的攒钱吧!
作者: altra    时间: 2009-6-16 21:50
<p>看起来不错啊!</p>
作者: wgzwing    时间: 2009-7-14 10:21
<p>很好</p>
作者: wgzwing    时间: 2009-7-14 10:21
<p>很好</p>
作者: sundong    时间: 2009-7-15 09:32
<p>收藏了</p>
作者: jameszhang    时间: 2009-7-23 08:47
thanks
作者: lhscau    时间: 2009-9-21 16:43
太贵了,没钱了,
作者: szqshi    时间: 2009-10-31 19:52
无钱寸步难行!
作者: ccp106    时间: 2010-3-4 23:45
正需要呢,刚注册,不知道有没有钱啊?
作者: wrr83    时间: 2010-6-25 22:37
<div id="textstyle_5" style="FONT-SIZE: 9pt; OVERFLOW: hidden; WORD-BREAK: break-all; TEXT-INDENT: 24px; WORD-WRAP: break-word">thanks </div>,,,没钱啊&nbsp;
作者: 非任性    时间: 2010-7-8 19:38
<p>看一下</p>
作者: gyc1983    时间: 2010-7-11 10:31
<p>怎么这么贵啊,新人怎么办</p>
作者: hujinping    时间: 2010-9-25 17:18
<p>好,谢谢</p>
作者: hujinping    时间: 2010-9-25 17:24
怎么赚取经费呀
作者: scoool    时间: 2011-2-17 13:33
<p>回帖吧!不然没钱</p>
作者: dovejin    时间: 2011-7-24 10:54
<p>不知道能不能下载。真的想看看。<br/></p>
作者: hengxing5918    时间: 2012-1-17 10:13
看内容还要钱啊!!!!
作者: benny512    时间: 2012-5-30 22:22
<p>没有钱没办法下!</p>
作者: hengxing5918    时间: 2014-2-13 11:19
要钱???
作者: hengxing5918    时间: 2014-2-13 11:20
没要钱啊。
作者: admin    时间: 2014-2-13 11:46
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