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The Offchip Delay ExtPort is not accurate

Question asked by fjlasjdfkj322038402 on Jun 2, 2016
Latest reply on Jun 8, 2016 by fjlasjdfkj322038402

Hi,

 

I found a problem about the Offchip Delay ExtPort module. I increase the delay value in 1ms. My testing tool is APx525. The results (unit ms):

 

setting     result

0               the module has a minimum value 1.33ms (64/48)

1               the module has a minimum value 1.33ms (64/48)

2               5.78          5.78 - 3.81 = 1.97

3               6.76          6.76 - 5.78 = 0.98

4               7.73          7.73 - 6.76 = 0.97

5               8.73          8.73 - 7.73 = 1.00

6               9.71          9.71 - 8.73 = 0.98

7               10.68        10.68 - 9.71 = 0.97

 

(the default delay(AD, DSP, DA) is 3.81ms)

 

Why?

 

Thanks,

Anthony

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