FMC CLK_DIR - pull-down and usage
Based on AFCZ review by P. Kulik
Rule 5.31: The Carrier card shall provide a 100Kohm pull-down resister on CLK_DIV signals to GND.
There must be a typo in the specification and CLK_DIV
should be read as CLK_DIR
. This pull-down is missing on AFC.
Another thing is that maybe we could connect those lines to MMC and set a direction of the clock MUX based on their states?