Hi, what are the recommended pullup/pulldown resistors for SPI signals for ADSP-21479 in master boot mode? Thanks!
I request you to kindly refer to page 94/112 of the ADSP-21479 EZ-Board which shows the pull up resistors connected to the SPI signals.
The link for the manual is given below:
You may also want to go through the following FAQ as well:
Please let me know if it helps or if you have any further queries related to this.
Hi Harshit, I am familiar with the ez-board schematic—it has resistor marked “DNP” on miso and clk. I know that sometimes a DNP label is deleted after debugging a prototype board and components are installed on a following revision, so can you confirm for me that the only recommended pullup resistor is on CS? Therefore MISO, MOSI, and CLK can be left floating?
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Yes this is correct.
MOSI, MISO and SPI_CLK can be left floating but since most of the commonly used SPI flash devices require a falling edge on chip select (/CS) prior to the start of an instruction after power up so it is recommended to pull up the SPI flash chip select.
Please let me know in case you have any further queries/doubts.
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