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

3.1 Read Check for Macro Error and Poll Check for Macro Done

  1. The device is configured through SPI using a combination of direct register reads/writes for simple configurations, and register writes to initiate macros. Macro commands abstract out the internal device configuration sequence to a simple set of configurations and simplify the host interaction. The commands reduce complex configurations into simple writes, avoid computation complexity on the host side and provide simple status information in response. Macro command is used at multiple places in bring-up.
  2. Macro Opcode: Operation code which informs AFE the operation to be performed. For differential operations of AFE, different Macro opcode is defined.
    Macro Operand: Operand are values or expressions that is used to perform an operation in AFE.
  3. The first SPIPoll, Poll for Bit 0 from Address 0xf0 which indicates if Macro/MCU is ready for a next operation. If the Poll fails, the MCU is still not ready for new operation and if we run a new macro operation the MCU can fail to execute.
  4. Later if Macro ready passes, operand and opcode are loaded.
  5. After that Macro Done status is polled #SPIPoll 00f0,2,2,04. This is to check if macro operation is complete.
  6. After that read check for 0xf0 bit 3 is read to check if macro operation was executed error free or had error.
  7. Bring-up can break if any of the this check fail. The following discusses if macro error and failure happen how to figure out the error and resolve the issue.

Sample Code

SPIPoll 00f0,0,0,01        	//MACRO_READY
SPIWrite 00a3,00,0,7	//MACRO_OPERAND_REG
SPIWrite 00a2,00,0,7	//MACRO_OPERAND_REG
SPIWrite 00a1,00,0,7	//MACRO_OPERAND_REG
SPIWrite 00a0,02,0,7	//MACRO_OPERAND_REG
SPIWrite 0193,01,0,7	//MACRO_OPCODE=0x1;
WAIT 0.001
SPIRead 00f0,2,2	//Read	MACRO_DONE=0x1;
SPIPoll 00f0,2,2,04
SPIReadCheck 00f0,3,3,00	//Read	MACRO_ERROR=0x0;
SPIRead 00f1,0,7	//Read	MACRO_ERROR_OPCODE=0x0;
SPIRead 00f0,4,4	//Read	MACRO_ERROR_IN_OPCODE=0x0;
SPIRead 00f0,5,5	//Read	MACRO_ERROR_OPCODE_NOT_ALLOWED=0x0;
SPIRead 00f0,6,6	//Read	MACRO_ERROR_IN_OPERAND=0x0;
SPIRead 00f0,7,7	//Read	MACRO_ERROR_IN_EXECUTION=0x0;
SPIRead 00f3,0,7	//Read	MACRO_ERROR_EXTENDED_CODE=0x0;
SPIRead 00f2,0,7	//Read	MACRO_ERROR_EXTENDED_CODE=0x0;