In the case of 4 DAC JESD links, there exist 2 links in top JESD and 2 other links in bottom JESD. In such a case, below procedure is used to set the RBD.

1. For the first link, based on the lane0_f_counter_all_lane_ready in the first page, link0_rbd_m1 is set in the first page.
2. For the second link, based on the lane2_f_counter_all_lane_ready in the first page, link1_rbd_m1 is set in the first page.
3. For the third link, based on the lane0_f_counter_all_lane_ready in the second page, link0_rbd_m1 is set in the second page.
4. For the fourth link, based on the lane2_f_counter_all_lane_ready in the second page, link1_rbd_m1 is set in the second page.

Example:

1. Link 1

   Read Page 0x16[2] : lane0_f_counter_all_lane_ready = 16 for link 1
   getAllLaneReady(afeInst,0,&laneAllReady)
   laneAllReady = 16 for link 1

   Link 2

   Read Page 0x16[2] : lane2_f_counter_all_lane_ready = 26 for link 2
   getAllLaneReady(afeInst,1,&laneAllReady)
   laneAllReady = 26 for link 2

   Link 3

   Read Page 0x16[3] : lane0_f_counter_all_lane_ready = 36 for link 3
   getAllLaneReady(afeInst,2,&laneAllReady)
   laneAllReady = 36 for link 3

   Link 4

   Read Page 0x16[3] : lane2_f_counter_all_lane_ready = 46 for link 4
   getAllLaneReady(afeInst,3,&laneAllReady)
   laneAllReady = 46 for link 4
2. Obtain valid range of RBD.

   Link 1

   getGoodRbdRange(afeInst,0,&rbdMin,&rbdMax)
   rbdMin = 17
   rbdMax = 35 (Based on skew = 3, rbdMax = min(allLaneReady) + BufferDepth - 10 = 16 - 3 + 32 - 10)

   Link 2

   getGoodRbdRange(afeInst,1,&rbdMin,&rbdMax)
   rbdMin = 27
   rbdMax =45 (Based on skew = 3, rbdMax = min(allLaneReady) + BufferDepth - 10 = 26 - 3 + 32 - 10)

   Link 3

   getGoodRbdRange(afeInst,2,&rbdMin,&rbdMax)
   rbdMin = 37
   rbdMax =55 (Based on skew = 3, rbdMax = min(allLaneReady) + BufferDepth - 10 = 36 - 3 + 32 - 10)

   Link 4

   getGoodRbdRange(afeInst,3,&rbdMin,&rbdMax)
   rbdMin = 47
   rbdMax = 1 (Based on skew = 3, rbdMax = min(allLaneReady) + BufferDepth - 10 = 46 - 3 + 32 - 10)
3. In this example, optimal value is chosen as rbdMin+3 = 20 for link1, 30 for link 2, 40 for link 3 and 50 for link 4. In cases with multiple AFEs on a PCB, valid ranges can be looked at for all AFEs and optimal RBD can be chosen.
4. The optimal RBD is set and adcDacSync is run.

   Link 1

   setManualRbd(afeInst,0,20)

   Link 2

   setManualRbd(afeInst,1,30)

   Link 3

   setManualRbd(afeInst,2,40)

   Link 4

   setManualRbd(afeInst,3,50)
   adcDacSync(afeInst,1)
5. Read back link0_sysref_cnt_on_release_opportunity from the first page for link 1, link1_sysref_cnt_on_release_opportunity from the first page for link 2, link0_sysref_cnt_on_release_opportunity from second page for link 3 and link1_sysref_cnt_on_release_opportunity from second page for link 4.

   Link 1

   getSysrefCntOnReleaseOpp(afeInst,0,&readVal)
   If readVal=1, optimal RBD is chosen as (20+1)%64 = 21

   Link 2

   getSysrefCntOnReleaseOpp(afeInst,1,&readVal)
   If readVal=1, optimal RBD is chosen as (30+1)%64 = 31

   Link 3

   getSysrefCntOnReleaseOpp(afeInst,2,&readVal)
   If readVal=1, optimal RBD is chosen as (40+1)%64 = 41

   Link 4

   getSysrefCntOnReleaseOpp(afeInst,3,&readVal)
   If readVal=1, optimal RBD is chosen as (50+1)%64 = 51
6. In the config, value of 21 is set for the link0_rbd_m1 in the first page, value of 31 is set for the link1_rbd_m1 in the first page, value for 41 is set for the link0_rbd_m1 in the second page and value for 51 is set for the link1_rbd_m1 in the second page. In Latte, sysParams.jesdRxRbd is set to [21,31,41,51]