SBAA637 June   2024 AFE7950

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 SPI Failure During Bring-Up
    1. 2.1 Detail Regarding Chip Readouts
    2. 2.2 Failure and Fix for Chip Read Check
    3. 2.3 Poll Check for SPI Access for PLL Page
    4. 2.4 Failure and Fix for the SPI Poll Check for PLL Page Access
    5. 2.5 Read Check Indicating Status of Fuse Farm Autoload
    6. 2.6 Failure and Fix for Autoload Read Check
  6. 3 Macro Failure Breaking the Bring-Up Flow
    1. 3.1 Read Check for Macro Error and Poll Check for Macro Done
    2. 3.2 Failure and Fix for Macro Error and Poll check for Macro Done
  7. 4 AFE PLL Failure
    1. 4.1 Read Check for PLL Lock
    2. 4.2 Failure and Fix for Read Check of PLL
  8. 5 AFE Internal Sysref Flag Failure
    1. 5.1 Read Check Status of Sysref Flag Bit
    2. 5.2 Failure and Fix for Read Check Status of Sysref Flag Bit
  9. 6 JESD Link Check Failure
    1. 6.1 Multiple Read Checks Indicating Status of JESD Linkup
    2. 6.2 Failure and Fix for JESD Error
  10. 7 Validating Serdes and JESD Link using CAPI
    1. 7.1 Useful Serdes Debug CAPIs
    2. 7.2 Useful JESD Debug CAPIs
  11. 8 TX Chain Validation
  12. 9 RX Chain Validation
  13. 10Device Health
  14. 11Summary
  15. 12References

7.2 Useful JESD Debug CAPIs

The following CAPI can be used for JESD debug.

getJesdRxLaneErrors: This is used to check for lane error.

getJesdRxAlarms: This function can log error in complete JESD and Serdes Link.

clearJesdRxAlarms: To clear JESD alarm, as JESD Alarm reg are sticky. To read fresh error status, the recommendation is to clear and read.

getAllLaneReady: This function reads the all lane ready counter which is the offset between the internal LMFC boundary and the multiframe boundary (in JESD204B) or extended multi block boundary (in JESD204C) of the last lane of arrival. This value with some offset is set in RBD.

setManualRbd: To set RBD #detail on how to set RBS is explained in another application note, (Determining Optimal Receive Buffer Delay in JESD204B and JESD204C Receivers).

adcDacSync: This is an important function to resync AFE JESD block, there is a requirement here to leak sysref during this function. Which is part of user define function.

The previous information can help to solve for JESD related failure during bring-up.

In previous sections, we have discussed about error or failure possible during AFE bring-up and possible cause for the failure along with guide to resolve the bring-up error. There are few more debugging actions that come handy post bring-up of AFE, when capturing the data for first time or in case of any failure post bring-up. AFE79xx has many functionalities which are dynamically programmable post bring-up and to control or enable those function, functions are made part of CAPI.