Hello,
We are finishing up the design of an IMX6 and we had a question about the three lines below. They come from the hardware design checklist. The questions are:
12a. What does a tandem 0Ohm resistor mean? Tandem to what?
12b Is the SD port clock trace the same as SDx_CLK?
13 From our reading of the errata/apnote, the safest method to accomplish this is to provide an external circuit to power down the SD cards?
14 Do we understand correctly that an in-line zero Ohm resistor is required on all of the SDx_CLK lines between the i.MX and the SD Card?
Thank you for the guidance,
BW
Not Sure | 12 | Add reserved tandem 0Ω resister in SD port clock trace and place near i.Mx6 side for SI consideration. | CUS | |
Not Sure | 13 | Please keep i.Mx6 "SDx_RESET" pin connecting properly with device reset pin when eMMC/SD fast boot is used in a design. (i.M6DQ AC and i.MX6SDL AB version had fixed this issue, don't need consider this item.) See below need to add I/O line to cycle SD card power. | ||
Not Sure | 14 | NAND_RE and SDx_CLK are loop back as internal reference clock at internal pad, recommend adding a series 0hom resister on these two signals and place near i.Mx6 pin side to reduce the potential reflect SI issue.” | CUS |
解決済! 解決策の投稿を見る。
Hi Boms
12a. 0Ohm resistor is used for testing and bringup purposes, can be removed in final design.
12b yes
13 usage of SD card "Reset" signal is described in SD specifications.
14 zero Ohm resistor is not required
Best regards
igor
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Hi Boms
12a. 0Ohm resistor is used for testing and bringup purposes, can be removed in final design.
12b yes
13 usage of SD card "Reset" signal is described in SD specifications.
14 zero Ohm resistor is not required
Best regards
igor
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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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Thank you very much.