TMS320F28075: the gpio 73 xclockout & EM1D11

Shuai Peng

Intellectual 780 points

Part Number: TMS320F28075

Hi all，

I found that on the 28075 the xclockout pin and the EM1D11 is the same pin.

But I want to use the EMIF to connect a cpld ,and the xclockout can provide a clock to the cpld, what should I do?

over 8 years ago

0 Vivek Singh over 8 years ago

TI__Guru** 116461 points

You can use clock generated from other module (e.g. ePWM) and use. If you are running EMIF at 100MHz then you could use EMIF CLK (EM1CLK) as well.

Vivek Singh

0 Shuai Peng over 8 years ago in reply to Vivek Singh

TI__Intellectual 780 points

Thanks for your reply， is the EMIFCLK always available or it is available only when the date exchanged between the dsp and cpld？
my goal is to save a cpld clock .

0 Vivek Singh over 8 years ago in reply to Shuai Peng

TI__Guru** 116461 points

It's always available (just like xclkout) but please note that max frq for this clock is 100MHz. So to use this clock, you need to run EMIF at 100MHz (not at 200MHz). There is divider for EMIF (PERCLKDIVSEL.EMIF1CLKDIV) which can be used to divide the SYSCLK /2. By default this is set to '1' which means EMIF CLK is SYSCLK/2.

Regards,

Vivek Singh

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28075: the gpio 73 xclockout & EM1D11