DCMI max transfer rate

armindavatgaran · ‎2017-01-24

Posted on January 24, 2017 at 19:28

Hello

It is mentioned in the table 87 (DCMI characteristics, stm32f405/407 datasheet, Rev7) that max DCMI_PIXCLK is 54 MHz, and it's mentioned in the RM0090 that this peripheral is capable of up to 54MBytes/s transfer rate. The question is, how number of data lines affects this throughput rate? is this rate just for 8 data lines (because of that it uses whole of data register)?

Thanks.

Amel NASRI · ‎2017-01-25

Posted on January 25, 2017 at 11:35

Hi

tag.aseok

‌,

For the same datasheet table (

DCMI characteristics), it is specified that configuration used 'Data format: 14 bits'.

Referring to RM0090, we have the following:

- 8-bit data: 'to capture a 32-bit word, the camera interface takes four pixel clock cycles.'

- 10/12/14-bit data: ' a 32-bit data word is made up every two pixel clock cycles'

-Amel

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armindavatgaran · ‎2017-02-09

Posted on February 10, 2017 at 06:28

Hello, according to that table, 54MHz * (7/4 Bytes) = 94.5 MBytes/s. Is it correct?