HD data bus

alex trujillo21

Other Parts Discussed in Thread: TMS320C6416

hello,

I'm using the EMIF data pins for control a DAC board,
I have the emif clock connected to ground, pin 78 of J3.
This is a part of my code

//defino la salida de la placa

# define OUTPUT 0xA0000000

unsigned int *output =(unsigned int*)OUTPUT;

unsigned int exit;

void setup()
{
    /*iniciamos un vector con todo 0 menos 
    el W/R que lo dejamos a uno posicion 25*/
    exit=0;//32 bits a 0;
    exit = (1<<24 | exit);
    *output=exit;//escribimos en memoria;
}
void main()
{                   
 
     
    setup();
.
..
...
}

it's working correctly, but I need control a ADC board, i know that the DSK board have his own's conversors, but I need the DC. I know the limitations that have the audio conversor.

I only want do the same using the HD data bus[0:31], in some documents I read that they are named AD[0:31].

Thanks

over 10 years ago

0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

Hi Alex,

What is your processor and EVM board ?

0 alex trujillo21 over 10 years ago in reply to Titusrathinaraj Stalin

Prodigy 80 points

Hello,

my processor is 6416, and my board is DSK, tms320c6416,

thanks

0 Senthilkumar Srinivasan over 10 years ago

TI__Mastermind 43660 points

Hello Alex,

it's working correctly, but I need control a ADC board, i know that the DSK board have his own's conversors, but I need the DC. I know the limitations that have the audio conversor.

Could you please elaborate your requirement ? Do you want to interface an ADC with EMIF ?

I only want do the same using the HD data bus[0:31], in some documents I read that they are named AD[0:31].

Are you referring EMIF data bus here ? Could you please highlight which document you referred ?

Regards,

Senthil

0 alex trujillo21 over 10 years ago in reply to Senthilkumar Srinivasan

Prodigy 80 points

hello,

Now I have connected to the J4 connector a DAC board using the signal AED(EMIF DATA PIN), i need connect another board to the DSK, and I think that i can use the J1 connector using the signal AD, PCI data.

I read in the SPRS146G, that the data of HPI is named HD[0:31]/AD[0:31], like data of EMIFA is AED[0:63]

0 Senthilkumar Srinivasan over 10 years ago in reply to alex trujillo21

TI__Mastermind 43660 points

Hello Alex,

I don't think you can connect ADC to PCI interface. I do not find any reference document regarding this.

However you can refer the below application note for ADC interface.

http://www.ti.com/lit/an/slaa130/slaa130.pdf

I read in the SPRS146G, that the data of HPI is named HD[0:31]/AD[0:31], like data of EMIFA is AED[0:63]

The HD[0:31] refers to HPI data bus and AD[0:31] refers to PCI data/address bus. Both are multiplexed.

Regards,

Senthil

0 alex trujillo21 over 10 years ago in reply to Senthilkumar Srinivasan

Prodigy 80 points

hello,

ok,

and can i put high or low level de salida in the pins of connectors to my interest, as I am doing with pins emif, for example the pin 9 of J1 connector is I/O can I decide the exit level, high or low?

I'm doing this with the AED[0:31]

0 Senthilkumar Srinivasan over 10 years ago in reply to alex trujillo21

TI__Mastermind 43660 points

Hello Alex,

Since you are using EMIF, you need to write the corresponding data in EMIF register to drive particular data pin high or low. You cannot use these like GPIO.

Regards,

Senthil

0 alex trujillo21 over 10 years ago in reply to Senthilkumar Srinivasan

Prodigy 80 points

I think we are not understanding.
forget all.
I start again.
I have this:

# define OUTPUT 0xA0000000

unsigned int *output =(unsigned int*)OUTPUT;

exit=0;
exit = (1<<24 | exit);
*output=exit;

and this changes the output pin 24 of connector J4 at a high level and the others AED at low level.

this commands can modify the 32 AED at my convenience.

I would like to do something similar with the HD bus connector J1. is it possible?

I do not want to use any protocol, I just want to change the voltage level on the pins.

thanks,

Alex

0 Titusrathinaraj Stalin over 10 years ago in reply to alex trujillo21

TI__Guru** 116100 points

Hi Alex,

J1 connector has HPI pins which is muxed with PCI and GPIO peripheral, so I think you can access 8pins of GPIO from J1 connector.

http://www.ti.com/lit/ds/symlink/tms320c6416.pdf

Refer to the page no 7 for HPI & PCI configuration.

Also refer to the page no 33,37,39 and 44.

We can access the both GPIO and HPI by configuring the AA4 and AF3 pins (McBSP_EN and PCI_EN)

You can use J1 connector as PCI or HPI or GPIO peripheral.

I'm not sure that whether we can access the HPI & PCI addressing like EMIF but GPIO will do that things.

# define OUTPUT 0xA0000000
unsigned int *output =(unsigned int*)OUTPUT;
exit=0;
exit = (1<<24 | exit);
*output=exit;

From your code snippet,

You are accessing the EMIFA CE2 addressing space(0xA0000000), so you can't access the PCI like EMIFA since PCI & HPI doesn't have address space like EMIFA just had memory only for control registers.

Check the memory map table of C6416 data sheet (page no 12)

0 alex trujillo21 over 10 years ago in reply to Titusrathinaraj Stalin

Prodigy 80 points

Sorry, I was busy. A lot of thanks for all. I think I can do something with what you just told me.

And my last question: The EMIFA have 20 pins, for address. These address pins are only output. I can modify this outputs like I'm doing with the EMIF data. Sorry because I don't have knowledge about this topic.

Alex

0 Senthilkumar Srinivasan over 10 years ago in reply to alex trujillo21

TI__Mastermind 43660 points

Hello Alex,

You can use the EMIF address lines as output and able to toggle, but it depends on the memory space you are accessing. You cannot drive the address line as your wish, like you are doing on data line.

Regards,

Senthil

0 alex trujillo21 over 10 years ago in reply to Senthilkumar Srinivasan

Prodigy 80 points

Hi!

OK , I found a document that explain how to do something similar to what I want do, but I'm not sure.

The document is SPRA536B. WIth this can I use the Data bus of HPI?

thanks.

0 Senthilkumar Srinivasan over 10 years ago in reply to alex trujillo21

TI__Mastermind 43660 points

Hello Alex,

The HPI interface also does not have memory space for data unlike EMIF. If you think HPI interface satisfies your requirement, please go ahead and test out on your own risk.

Regards,
Senthil

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