Revision History / Summary of differences in these revisions

Question

Dear Team, 
 
 There are many revisions of EVAL-ADUSB2EBZ that were present , However, we see that there is no revision history that tells us about the differences in this board with every revision (for example what is the difference between Rev1.2,1.3,1.4 and 1.5) 
 Although I understand that most of Sigma 300/350 works well with 1.4 and 1.5 . I am particularly interested in the older versions(Rev1.2/1.3 etc) of this board and its evolutionary history. 
 Is there any document that can help me learn more about this and what differences does each revision hold in terms of SPI communication/ resistors/ Board .

Regards, 
 Zayn

DaveThib · Answer

Hello Zayn, 
 No, we do not have a document detailing the revisions. 
 I do know that Rev 1.5 added a mode for A2B network where the formatting of the SPI commands needed to be different. 
 The earlier versions were mostly hardware related. The older revisions go way back. The 1.3 and 1.2 etc. One is where we added series resistors on the SPI output to protect the device when people would connect it to devices with other SPI masters and were damaging the boards. There was one software improvement to prevent the USBi from locking up in some corner cases. 
 Why are you asking? 
 If you are connecting it to a SigmaDSP then Rev 1.4 or 1.5 is fine. If you are using A2B then Rev 1.5 is what you should have. 
 Dave T