Intel® Stratix® 10 Hard Processor System Technical Reference Manual

ID 683222
Date 1/25/2024
Public
Document Table of Contents

16.5.1.1. Avoiding Glitches in the Card Clock Outputs†

To avoid glitches in the card clock outputs (sdmmc_cclk_out), the software should use the following steps when changing the card clock frequency:

  1. Before disabling the clocks, ensure that the card is not busy due to any previous data command. To determine this, check for 0 in bit 9 of the STATUS register.
  2. Update the Clock Enable register to disable all clocks. To ensure completion of any previous command before this update, send a command to the CIU to update the clock registers by setting:
    • start_cmd bit
    • "update clock registers only" bits
    • "wait_previous data complete"
      Note: Wait for the CIU to take the command by polling for 0 on the start_cmd bit.
  3. Set the start_cmd bit to update the Clock Divider, Clock Source registers, or both and send a command to the CIU in order to update the clock registers. Wait for the CIU to take the command.
  4. Set start_cmd to update the Clock Enable register in order to enable the required clocks and send a command to the CIU to update the clock registers. Wait for the CIU to take the command.