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TMS320F206PZA: different marks on device

Hello everybody,

I know TMS320F206PZA is very old part. But I ask to help me with different marks on this device.

Our customer found this DSP in China stocks somewhere. All units are packaged into one tray but some parts have mark 21A00FW on the body while some parts have 21A080W mark.

Could anybody to explain what is the difference between these codes? Does it means these DSPs had been got from different lots/sources? Or does it means different data code, for example?

Please check the photo enclosed.

Thanks for help.

Looking forward to any reply.