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Jamber
Level 3
Level 3
25 replies posted 50 sign-ins First like received

In TC377, what's the problem with DMA and CPU access a same SRAM at the same time? For example, during CPU reading a variable DMA moves a data to the variable, or during DMA moving a data to a variable CPU reads it, what will happend in this case?

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MoD
Employee
Employee
250 sign-ins 25 likes received 50 solutions authored

There is no problem. DMA and CPU don't access at the same time the SRAM (this not a dual port ram). If one of them access the SRAM then the other wait for access from other finished and access then the SRAM.

For your example: If CPU reading a variable when DMA moves a data to the variable, then the CPU will read the old value or the new value dependent which access was earlier.

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MoD
Employee
Employee
250 sign-ins 25 likes received 50 solutions authored

There is no problem. DMA and CPU don't access at the same time the SRAM (this not a dual port ram). If one of them access the SRAM then the other wait for access from other finished and access then the SRAM.

For your example: If CPU reading a variable when DMA moves a data to the variable, then the CPU will read the old value or the new value dependent which access was earlier.

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