EMIFA 16bit (C6747)

Hi Brady,

What is the device you are trying to use?

Please refer to the TRM of C6747 http://www.ti.com/lit/ug/spruh91b/spruh91b.pdf  which states the pin descriptions of EMIFA_A.

Assuming, If your device is an SDRAM, please refer to section 18.2.4.2 which deals about interfacing the column and row address bits of SDRAM.

In the data sheet,http://www.ti.com/lit/ds/symlink/tms320c6747.pdf, it illustrates EMIFA connection examples which may help you better ( "C6745/6747 Connection Diagram: SDRAM, NOR, NAND" )

regards,

Shankari.

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The C6747 does not bring out the all of the EMIFA address lines to pins. I think the best you can get is 15 bits of address through EMA_A[12:0], BA[1:0].

Hi Norman,

I want to know detail connection.

BA[1:0] -> A[1:0],     EMA_A[12:0] -> A[14:2]

Is it right?

Please, inform me

Brady

Thanks&Regards

Yes. To reiterate:

DSP A[14] -> EMA_A[12]
...
DSP A[2] -> EMA_A[0]
DSP A[1] -> BA[1]
DSP A[0] -> BA[0]

Note that 16-bit data devices do not use BA[0]. See EMIFA section in the TRM.

Hi,

But I don't understand 

Please, Inform me.

The figure describes the connection accurately. Please elaborate as to what you do not understand. I'll repeat the diagram with soem C code.

For an 8-bit data device:

DSP A[14] -> EMA_A[12] -> 8-bit Device A[14]
...
DSP A[2] -> EMA_A[0] -> 8-bit Device A[2]
DSP A[1] -> BA[1] -> 8-bit Device A[1]
DSP A[0] -> BA[0] -> 8-bit Device A[0]

char  x0;
char  x1;
p  = (char *)0x60000000; // CS2
x0 = *p++; // dsp addr = 0x60000000, dev addr = 0x0000
x1 = *p++; // dsp addr = 0x60000001, dev addr = 0x0001

For a 16-bit data device:

DSP A[14] -> EMA_A[12] -> 16-bit Device A[13]
...
DSP A[2] -> EMA_A[0] -> 16-bit Device A[1]
DSP A[1] -> BA[1] -> 16-bit Device A[0]
DSP A[0] -> BA[0] -> Not used

short  x0;
short  x1;
p  = (short *)0x60000000; // CS2
x0 = *p++; // dsp addr = 0x60000000, dev addr = 0x0000
x1 = *p++; // dsp addr = 0x60000002, dev addr = 0x0001

Thanks for your reply.

I want know this red rectangle mean.

This will use my application.

Please, inform me.

Thanks & Regards.

Thanks for your reply.

Can you provide example sw?

Please, inform me.

Thanks & Regards.

I don't understand. SW for what?

I want to use address 0x6000-0000 ~ 0x6000-ffff.

I want to know appropriate solutions.

Can you provide solution?

Thanks & Regards.

Sorry, I don't understand what you are asking. An appropriate solution requires a clearly stated problem. For 0x60000000 ~ 0x6000FFFF, that would be CS2. You will need connect CS2 to your device. Follow the TRM to configure EMIFA CS2.

Thanks for reply.

I need detail information that register setting to change EMA_A[13] from EMA_BA[0].

I want detail information that included address and value.

I can't find related information to TRM document. 

Thanks & Regards.

I am guessing that once you choose 16-bit data mode, EMA_A[13] automatically becomes EMA_BA[0]. EMIFA CS2 is configured through CE2CFG. You will also need to setup the PINMUX for EMIAF. You might have enable the EMIFA module in PSC. Are you using an OS? Base metal? StarterWare?

Thanks for your reply.

I'm not using OS.