about AD9517-2 reg configration

when i configration the AD9517-2,my configration is display as bellow;(use REF2 as reference clock,use the intener VCO);

  

0004 01
0010 7C
0011 01
0012 00
0013 00
0014 19
0015 00
0016 04
0017 00
0019 00
001A 00
001B C0
001C 46
001D 00
0232

01

  

0018 07
0232 01
0018 06
0232 01
01E0 02
01E1 02
0018 07
0232 01

  

00F1 08
00F5 08
0140 52
0141 52
0142 52
0143 52

  

0199 22
019B 22
019E 22
01A0 22
0190 22
0196 22

when i read the reg 0x001F,it is 0101 1111;

but the output4 and output6 can not get the clock output.  who can tell me why?thanks!