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LM3S9B90: what means experimental version MCU

Part Number: LM3S9B90

dear all,

I have a LM3S9B90 in my hand and I notice below information on date sheet. 

in second line, the last characters means experimental or fully qualified. so I want to ask:

1. XD means is same with X? 

2. if I have a X version MCU, is it means I can't use it on my PCB?

thanks a lot.