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eim negative timing parameters

Question asked by fpgaace on Sep 10, 2014
Latest reply on Sep 11, 2014 by igorpadykov

I believe I understand what's intended but being relatively new to the EIM interface I'd like to be sure before designing to it.  I'm referencing the Figure 12 waveforms and Table 42 bus timing parameters in i.MX 6Solo/6DualLite Automotive and Infotainment Applications Processors, Rev. 3


Using timing parameter WE4 for example, and t=10ns, WE4 = -3.25ns which is negative.  If you map WE4 onto the waveform it shows address becoming valid before the rising edge of BCLK by a negative 3.25ns.  However the WE4 description says, "Clock rise to address valid" which is saying the address becomes valid after the rising edge.  So, the parameter description and waveform don't match with one another, and the parameter value is negative.

 

If I leave the waveform alone and convert the WE4 parameters to positive values (plus flipping min/max) then I assume that's the right timing.  Can someone confirm and clarify this for me please?

 

Thanks, and sorry for the dumb question.

Mike.

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