| 2022.04.04 |  
      22.1 |  
       
        
        - Updated instances of AXI target to AXI manager.
  
        - Updated crypto service-specific parameter name from HAS_OFFLOAD to Enable Crypto Service. 
  
        - Added bit 8 and bit 9 in the following tables: 
         
 
          -  Interrupt Enable Register 
  
          -  Interrupt Status Register 
  
             
        - Updated the Command List and Description table. 
         
 
          - Updated pin status description for the CONFIG_STATUS  command. 
  
          - Removed the REBOOT_HPS command. 
  
             
          |  
     
 
      
      | 2021.11.10 |  
      21.3 |  
      Made the following changes: 
        
        - Updated the device family support for  Intel® Agilex™  devices. 
  
        - Added new section describing support for cryptographic services. 
  
        - Revised Interrupt Enable Register table. Added new registers: 
         
 
          -  EN_CRYPTO_MEMORY_TIMEOUT 
  
          -  EN_CRYPTO_ERROR_RECOVERY_PROGRESS 
  
             
        - Revised Interrupt Status Register table. Added new interrupts: 
         
 
          -  CRYPTO_MEMORY_TIMEOUT 
  
          -  CRYPTO_ERROR_RECOVERY_PROGRESS 
  
             
        - Revised Command List and Description table. Updated description for: 
          
  
        - Updated the mailbox_client_send_cmd command in the Driver API section. 
         
 
          - Revised response buffer length declaration from a pointer (alt_u32* resp_buf_len) to an integer (alt_u32 resp_buf_len). 
  
          - Added an ENOBUFS-related footnote. 
  
             
          |  
     
 
      
      | 2021.06.21 |  
      21.2 |  
      Made the following changes: 
        
        - Revised Interrupt Enable Register. Added note about enable bits. 
  
        - Revised Command List and Description table. Updated description for: 
         
 
          -  RSU_STATUS 
  
          -  QSPI_OPEN 
  
          -  QSPI_SET_CS 
  
          -  QSPI_ERASE 
  
             
        - Revised Read Command Description in the Using the Mailbox Client  Intel® FPGA IP . Added attention note about accessing SDM over an  Avalon® memory-mapped interface. 
  
        - Revised   Nios® II HAL Driver. Added text about absolute addressing to the quad SPI. 
  
        - Added mailbox_client_flash_get_info operation in the Driver API section. 
  
        - Removed Driver API Application topic. The content was moved to a file referenced in the Driver API section. 
  
        - Updated Appendix: CONFIG_STATUS and RSU_STATUS Error Code Descriptions. Added 0xD00D - 0xD013 minor error codes descriptions. 
  
          |  
     
 
      
      | 2021.03.29 |  
      21.1 |  
      Made the following changes: 
        
        - Revised the Flow Chart for Response Packet figure and the Read Command Description section. 
  
        - Revised RSU_IMAGE_UPDATE description in the Command List and Description table. 
  
        - Added new topics: 
         
 
          -    Nios® II HAL Driver 
  
          -  Driver API 
  
          -  Driver API Application 
  
             
        - Restructured Operation Commands. Moved major and minor error code descriptions for the CONFIG_STATUS and RSU_STATUS commands to the Appendix: CONFIG_STATUS and RSU_STATUS Error Code Descriptions. 
  
          |  
     
 
      
      | 2020.12.14 |  
      20.4 |  
      Made the following changes: 
        
        - Revised block diagram description in the Mailbox Client  Intel® FPGA IP User Guide topic. 
  
        - Updated the Mailbox Client  Intel® FPGA IP System Block Diagram figure. The figure depicts various ways to communicate with Mailbox Client IP. 
  
        - Added important note about resetting QSPI flash in the Operation Commands topic. 
  
        - Updated the Command List and Description table: 
         
 
          - Revised GET_TEMPERATURE command description. Clarified difference between  Intel® Stratix® 10 and  devices. 
  
          - Revised RSU_IMAGE_UPDATE command description. 
           
 
            - Added text about resetting QSPI flash. 
  
            - Added text describing behavior between the external host and FPGA. 
  
            - Removed text: Returns a non-zero response if the device is already processing a configuration command. 
  
               
          - Updated QSPI_WRITE and QSPI_READ descriptions to specify that the maximum transfer size is 4 kilobytes or 1024 words. 
  
          - Corrected response length from 1 to 0 for the QSPI_OPEN, QSPI_CLOSE and QSPI_SET_CS command. 
  
          - Revised QSPI_OPEN, QSPI_WRITE, QSPI_READ_DEVICE_REG, and QSPI_WRITE_DEVICE_REG descriptions. 
  
          - Added a new command: REBOOT_HPS. 
  
             
        - Added new topic: Error Code Recovery. 
  
        - Revised Timer Registers topic. Added footnotes and updated registers description. 
  
        - Updated Flow Chart for Reading Response Packet figure. 
  
          |  
     
 
      
      | 2020.10.05 |  
      20.3 |  
      Made the following changes: 
        
        - Revised GET TEMPERATURE command description for  Intel® Agilex™  devices in the Command List and Description table. 
  
        - Added recommendation about the reset synchronizer in the Mailbox Client FPGA Core Signals section. 
  
        - Updated the Error Codes table. Added new error code responses: 
         
 
          -  HW_ERROR 
  
          -  COMMAND_SPECIFIC_ERROR 
  
             
          |  
     
 
      
      | 2020.06.30 |  
      20.2 |  
      Made the following changes: 
        
        - Revised LENGTH and Command Code/Error Code descriptions in the Command and Response Header Description table. 
  
        - Revised GET_TEMPERATURE command description in the Command List and Description table. 
  
        - Removed UNKNOWN_BR command from the Error Codes table. 
  
        - Added new timer feature to handle the error detection for the incomplete transaction timeout error and the SDM backpressure timeout fatal error. 
  
        - Added support for an EOP_TIMEOUT interrupt which indicates that the full command did not include the EOP. 
  
        - Added support for a BACKPRESSURE_TIMEOUT interrupt which indicates that an error within the SDM occurred. 
  
        - Removed SD/MMC text from the CLIENT_ID_NO_MATCH description in the Error Codes table. 
  
        - Updated write and read command descriptions in the Using the Mailbox Client Intel FPGA IP section. 
  
          |  
     
 
      
      | 2020.04.13 |  
      20.1 |  
      Made the following changes: 
         |  
     
 
      
      | 2020.03.17 |  
      19.3 |  
      Made the following changes: 
        
        - Updated the Error Codes table: 
         
 
          - Renamed INVALID_COMMAND_PARAMETERS to INVALID_LENGTH. 
  
          - Changed COMMAND_INVALID_ON_SOURCE hex value from 5 to 6. 
  
          - Changed CLIENT_ID_NO_MATCH hex value from 6 to 8. 
  
          - Changed INVALID_ADDRESS hex value from 7 to 9. 
  
          - Added AUTHENTICATION_FAIL command. 
  
          - Changed TIMEOUT hex value from 8 to B. 
  
          - Changed HW_NOT_READY hex value from 9 to C. 
  
             
          |  
     
 
      
      | 2019.09.30 |  
      19.3 |  
      Made the following changes: 
        
        - Added device support for the  Intel® Agilex™  device. 
  
        - Added support for a COMMAND_INVALID interrupt which indicates the command length specified in the header does not match the actual command sent. 
  
        - Changed name of the IP from Mailbox Client  Intel® Stratix® 10 FPGA IP to Mailbox Client Intel FPGA IP. 
  
        - Revised introduction including the Figure 1: Mailbox Client Intel FPGA IP System Block Diagram. 
  
        - Revised the Flow Chart for Writing Command Packet and Flow Chart for Reading Response Packet to include logic to handle multiple word commands and responses. 
  
        - Changed references to names of all mailbox client IPs. The mailbox clients IP no longer include the  Intel® Stratix® 10 FPGA in their names. 
  
        - Added reference to AN 891: Using the Reset Release Intel FPGA IP. 
  
        - Added reference to the   Intel® Agilex™  Power Management User Guide. 
  
        - Updated the description of the GET_TEMPERATURE command to say the mask argument is optional. When omitted, the command returns the temperature for sensor 0. 
  
        - Updated the RSU_STATUS command to say the highest priority failing image, not the last failing image. The error information is for the first failing image which is the highest priority failing image. 
  
        - Added descriptions for CONFIG_STATUS and RSU_STATUS major and minor error codes. 
  
        - Added HPS_COLDRESET and HPS_WARMRESET to the list of soft functions for the CONFIG_STATUS command. 
  
        - Added Mailbox Client Intel FPGA IP User Guide Archives topic. 
  
        - Added the following Intel FPGA IPs to the list of IPs that require proper use of the Command and Command last registers: 
         
 
          - Advanced SEU Detection Intel IP 
  
          - Partial Reconfiguration Controller Intel IP 
  
          - Partial Reconfiguration External Configuration Controller Intel FPGA IP 
  
          - Edited entire user guide for clarity and style. 
  
             
          |