topic Re: SGPIO data sampling-in clarity in LPC Microcontrollers

SGPIO data sampling-in clarity

JonathanBalat — Thu, 20 Jul 2023 04:33:20 GMT

Hi NXP Team!

I'm a little confused on how SGPIO samples. What I have at the moment is a loop-back to understand how these slices work.

My setup:

SGPIO4 - clk reference output
SGPIO5 - data output
SGPIO10 - data input

SGPIO 10 set to use external clk pin on SGPIO 9 and I was able to get some data just fine.

My confusion here is I realized my data out and data in were using rising edge to transmit and receive the data. My understanding so far is when we transmit the data we do that on one edge, then sample on the other edge. Is there any references that can explain how data is sampled into a slice?

Thanks!

Re: SGPIO data sampling-in clarity

xiangjun_rong — Wed, 26 Jul 2023 06:54:01 GMT

Hi,

Pls refer to the application note an11343.pdf from the link:

https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/lpc4300-arm-cortex-m4-m0/high-performance-32-bit-microcontroller-mcu-based-on-arm-cortex-m4-m0-cores:LPC4313JET100?fpsp=1#documentation

As the following Fig, if you use external clock, you can select the clock edge to shift data by using the external clock or inverter of external clock. If you use internal clock SGPIO_clock, you can not select the edge.

Hope it is helpful.

XiangJun Rong