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About restriction of RDCYCLETIME in GPMC of AM335x

RY9983
Guru 10570 points

Hello.
There is a description about restriction of RDCYCLETIME on TRM spruh73g(P279) :

7.1.3.3.9.8.1 Access Time on Read Access
GPMC_CONFIG5_i[4-0] RDCYCLETIME must be greater than RDACCESSTIME
in order to let the GPMC latch the last return data using the internally retimed GPMC_CLK.

Is it applied for asynchronous read mode?
Because, since it seems to be for only synchronous read mode, I would like to confirm it.

Best regards, RY

  • 0
    TI__Guru**** 393215 points
    Hi RY,
     
    The whole paragraph is this:
     
    "GPMC_CLK which is sent to the memory device for synchronization with the GPMC controller, is internally retimed to correctly latch the returned data. PMC_CONFIG5_i[4-0] RDCYCLETIME must be greater than RDACCESSTIME in order to let the GPMC latch the last return data using the internally retimed GPMC_CLK."
     
    GPMC_CLK is sent to synchronous memories only.