SBAA543 July   2022 AFE7900 , AFE7920 , AFE7950

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2JESD204C
    1. 2.1 Basic Review of JESD204C Protocol
    2. 2.2 Finding Optimal RBD for JESD204C
  5. 3JESD204B
    1. 3.1 Basic Review of JESD204B Protocol
    2. 3.2 Finding Optimal RBD for JESD204B
  6. 4Setting RBD in AFE79xx
    1. 4.1 Register Map
    2. 4.2 Setting RBD in Configuration Sequence
    3. 4.3 Finding Optimal RBD using CAPI
      1. 4.3.1 Use Case with 1 JESD Links
      2. 4.3.2 Use Case with 2 JESD Links
      3. 4.3.3 Use Case with 3 JESD Links
      4. 4.3.4 Use Case with 4 JESD Links
  7. 5Fixing Potential Alarms Related to RBD
    1. 5.1 RBD Alarm
    2. 5.2 SoEMB Close to LEMC Edge
    3. 5.3 Start of ILA Close to LMFC Edge
  8. 6References

4.3 Finding Optimal RBD using CAPI

The previous discussions explained the process of setting optimal RBD from a top level view. This section explains the changes to procedure in case of various cases with the help of CAPIs.

In Section 4.3.1 through Section 4.3.4, below terminology is used.

Top JESD – This refers to the first 4 lanes in JESD. The page select for this is 0x16[2]. 0x16[2] is termed as the first page.

Bottom JESD – This refers to the last 4 lanes in JESD. The page select for this is 0x16[3]. 0x16[3] is termed as the second page.

All examples in this section use 204C with E = 1 and skew value of 3. For other values of E or for JESD204B, the modulus operation has to be performed with the right numbers as described in examples from Section 2.2 and Section 3.2. The text in italics correspond to CAPI calls.