Hi,
I use multi 21565s in my board, each 21565 exchange datas through SPORTs with others. One MCU control and update coefficients in 21565s using UART0.
My questions are below.
1. In datasheet, 21565 CLKIN0 is 1.8V input, however the other chips such as ADC,DAC in my board is 3.3V input. To sync all the chips I should use one on crystal. If I use 1.8V supply, how to get 3.3V clock. Or If I use 3.3V supply, how to get 1.8V clock.
2. This is a strange problem I met in two of all 21565s in my board. I don't know it is hardware or software problem. In 21565 I use UART0 to receive coefficients, It seems that when the UART0 interrupt occur, the datas of one SPORT will be disturbed, but the other SPORTs is normal. If I exchange the DAI pins of the troubled SPORT and the normal SPORT, then the problem will change to the new DAI pins of troubled SPORT. So the problem maybe come from the SPORT.
Both the 2 chips which have this problem, if I close the UART0, the problem disappeared. One chip I change the UART0 init affer SPORTs init, then the problem is solved. The other chip I can't solve this problem anyway besides close UART0. If I disconnect the UART0 pins outside, the problem disappeared too.
Wish you can give me some directions what maybe cause this problem.
Thanks!
