i.MX7 Dual Maximum UART Baud Rate

adrianamickols — Tue, 24 Oct 2017 20:51:22 GMT

What is the maximum baud rate for UARTs on the i.MX7 Dual (for both the A cores and the M core)? We are looking at running at 5Mbps.

The family guide seems to imply that it is based on the "module_clock." Is this UART1_CLK_ROOT, etc listed in Table 5-11? This table seems to imply that the maximum clock root frequency is 80MHz. If the 16x higher clock frequency from 14.3.4.2.2 is required for higher frequencies, this means the maximum baud rate is 5MBps. Is this correct?

15.3.4.2.2 Maximum Baud Rate
The max baud rate the UART can support is determined by the max frequency of the module_clock. For example, if the SoC can provide the fastest module_clock 66.5 MHz, the UART can transmit and receive serial data with the maximum baud rate 66.5M/16 = 4.15 Mbit/s. The UART supports serial IR interface low speed. In the low speed IrDA mode, the max baud rate is 115.2 Kbit/s. To support the 115.2 Kbit/s, module_clock frequency must be higher or equal to 1.8432 MHz.

Re: i.MX7 Dual Maximum UART Baud Rate

igorpadykov — Wed, 25 Oct 2017 23:03:45 GMT

Hi Adriana

this understanding is correct, maximum baud rate is 5MBps and uart is the same

as in i.MX6UL, i.MX6SX processors.

Best regards
igor
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i.MX7 Dual Maximum UART Baud Rate

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