Hello, all
According to RT1170 RM , RT1170 SAI1 support 4 TX & 4 RX data line.
Each data line support max 32 words (word size 8- to 32 bit)
each 32-bit FIFO can pack 8 bit or 16 bit.
And according to AN12202, 8 FIFO(32 bit) can support 8 TDM channels .
Question SAI1 maxisumly can support following TDM channels ?
Guess1 :
TX can support : 4 dataline × 32 ( FIFO numbers)=128 TDM chs
RX can support: 4 data line × 32 (FIFO numbers) =128 TDM chs
Guess2:
each 32 bit FIFO of RT1170 can only support 16 bit packing.
TX can support : 4 dataline × 32 (FIFO numbers) /2 =64 TDM chs
RX can support: 4 data line × 32 (FIFO numbers)/2 =64 TDM chs
Best regard
ZHOU
Solved! Go to Solution.
Hi @ZHOU_XIAO ,
Thanks for your trust, in fact, we are colleagues!
About your question, please note the following two points, then you will get the answer:
1. Please note, RT1170 SAI1 didn't support 4 TX & 4 RX data line in the same time, this is very important.
Because the SAI1_TX_DATA1-DATA3 share the line with SAI1_RX_DATA1-DATA3.
2. each data line can support up to 32 channel TDM, this is confirmed.
I think, you already get the answer.
BTW, to our NXP engineer, we have the internal community for discussion:
https://community.nxp.com/t5/RT-4-Digit-10xx-11xx-12xx/gh-p/52590
Then, our AE can also help us.
Wish it helps you!
Best Regards,
Kerry
Hi @ZHOU_XIAO ,
Thanks for your trust, in fact, we are colleagues!
About your question, please note the following two points, then you will get the answer:
1. Please note, RT1170 SAI1 didn't support 4 TX & 4 RX data line in the same time, this is very important.
Because the SAI1_TX_DATA1-DATA3 share the line with SAI1_RX_DATA1-DATA3.
2. each data line can support up to 32 channel TDM, this is confirmed.
I think, you already get the answer.
BTW, to our NXP engineer, we have the internal community for discussion:
https://community.nxp.com/t5/RT-4-Digit-10xx-11xx-12xx/gh-p/52590
Then, our AE can also help us.
Wish it helps you!
Best Regards,
Kerry
Hello, @kerryzhou I have a additional question about this topic.
As the following equation shows, the number of chs also depends on the sample rate,
You said that . each data line can support up to 32 channel TDM, what is the sample rate in your case?
Best regard
ZHOU
Hi @ZHOU_XIAO ,
sample rate is determined by your application.
You can use the sample rate, channel number, to calculate which bclk you needed, then configure the related MCLK and clock source frequency.
Wish it helps you!
Any new issues, welcome to create the new case.
Best Regards,
Kerry