Honored ContributorThe question is: We use RS-232 of 2 000 000 bps, and due to the fact that speed never changes, there is no necessity in software initialization. Is there any possibility to create UART of 2 000 000 bps without software initialization "Fixed baud rate"?
Honored Contributorsorry,i don't know.
Honored ContributorSure.
If you use the standard UART module supplied with sopc builder, you have both choices in component properties: fixed baud rate (defined in sopc builder) or programmable by means of a divisor register. If you use another custom UART core, you still have a divisor/baudrate register: simply set it to the fixed value you require.Honored ContributorHi,
I got similar question about how to make High-Speed Inter-Chip through I2C, i.e. 480Mb as USB2.0? Is there any IP or test board available? Thanks,:cool:Honored ContributorHi, Cris72! I know that UART speed can be adjusted by software and hardware means. My question was: can UART be adjusted by hardware (with the set "Fixed baud rate") for speed of 2 000 000 bps?
Honored ContributorThe standard UART core available with sopc builder, set the baudrate through a divisor register according to this equation:
baudrate = clock_frequency / (divisor + 1) So, if baudrate is an exact multiple of clock_frequency, you don't have any problem. This is relevant only for low divisor values, while for high divisor/low baudrate a few lost decimals don't matter. Also consider that, although you can virtually use divisor=1 to drive uart at half clock speed, this is usually not recommended since the receiver needs to synchronize to incoming data (remember the A in UART means Asynchronous). Other UART cores usually derive an internal sample clock 16x the system clock, so they require baudrate = clock_frequency / (16 * (divisor + 1))
