Difference between two TI parts

Hello Todd,

I am not able to identify these as TI part numbers.  I'm guessing these are the part markings on the top of the IC, but I'm not able to find any portion of these numbers are for a TI device.  You can use the Part Marking tool, try to match something: http://www.ti.com/packaging/docs/partlookup.tsp . 

If you could separate the marking sequences, and provide a picture, that would be helpful.  

And how do you know these are TI devices?

Regards,

~Leonard 

Hi Todd,

  Thanks!  Very helpful.  And just for clarification, in your original inquiry, you stated XD830 . . . and D840 . .    so I'm assuming you meant D830 as pictured, correct?

~Leonard 

Ack! Apologies for the original typo. You are correct, it is the D830 that I am interested in.

If it helps, what I am seeing is that the XD830 will boot without errors. USB and Network both function and all surround sound functions work as designed. The issues start when I try to play any audio from an iPhone (through the USB) or if I try to stream any audio from Internet services like Slacker. In those instances, I can see that the audio stream is being processed but I get 1 second of sound and then nothing (but the visual interface on the receiver shows that the song is still playing). I have confirmed this on 3 different XD830 chips. When I install a D830, it works perfectly. I ran ps in a linux shell and all the processes look correct which is why I asked if there were potentially some timing differences between the two. My test systems are running with a 20.000Mhz crystal if that helps. I assumed that since both are 400Mhz devices, they would be clocked the same but if the solution is as simple as installing the XD variant with a 24.000Mhz or some other speed, I am open to trying that.

thx
Todd