How Power-on reset work on AD5689R?

Question

Hello, 
 I have several question about AD5689R Power-on reset and power up sequence. 
 
 1)What function is the Command 0110 for this software reset ? 
 Is it the same function for Hardware reset (/RESET) with RSTSEL pin? ,or register is clear/default? 
 
 2)For initial power-up (cold start) to enter normal mode (not exit from power-down mode), 
 after VDD and VLOGIC power-up to 90%, 
 how long times wait "Power-Up Time" to RESET? 
 
 In datasheet, there are two specifications, but "Coming out of power-down mode" specifications. 
 
 Power-Up Time 
 2.5μs;Coming out of power-down mode; VDD = 5 V 
 
 Power-Up Time 
 4.5μs:Time that is required to exit power-down and enter normal mode of operation; 24th clock edge to 90% of DAC midscale value with output unloaded 
 
 Thank you for your help in advance. 
 Regards, 
 sss

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