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DAC38J84: Mystery around "alarm_sysref_sh"

Part Number: DAC38J84

Hello,

Looking at the 0x6C register, I see that there is the "alarm_sysref_sh". The GUI states that :

But in the datasheet, it is marked as reserved : 

Is this a 'functioning' alarm? If so, what are CDRV_SER, OSTROBE, 4T? 

Thanks