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Simple PCIe FMC carrier SPEC
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  • #24

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Opened Mar 28, 2014 by Projects@orson_admin
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V4 - Serial flash communication issue

Due to the mux (SN74LVC1G97DBVR) and depending on the clock communication with the M25P32 flash memory might not work as expected.
The mux adds a delay to the clock signal, while the data line from the memory doesn't have a mux.
As a result the data appear to change a the rising edge instead of the falling edge of the clock.
See attached presentation extract.

In addition, the data line is floating when the chip is not selected.
Therefore, adding a pull-up/down should be considered.

This issue has been reported by Magnus Vik Sundal and Heiko Damerau.

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  • spec_flash_comm.pdf
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Reference: project/spec#24