C674x DSP mem map vs EDMA mem map ?

RobbySun

Other Parts Discussed in Thread: TMS320C6745

Hi,

I was wondering if there exists a linker command file for the stand-alone single-core chip C674x that I could readily use. Of course, it's not that hard to write one myself. But I'm a little confused by the TMS320C6745/6747 datasheet (SPRS377d).

What's confusing is that there are two different physical addresses for L1P/L1D and L2 RAM. For example, in Table 3-4. C6747 Top Level Memory Map, the memory space 0x0080,0000 ~ 0x0083,FFFF is reserved for DSP L2 RAM, but the space 0x1180,0000 ~ 0x1183,FFFF is also used for DSP L2 RAM. Why is it like this? Which address should I use for L2 RAM? The same question also applies to L1D and L1P memory/cache.

I also need to understand more about the DSP memo map vs EDMA mem map. How are these two related? How to configure the chip so that I can be sure of which mem map I am using?

Thanks,

-Robby

over 14 years ago

0 tlee over 14 years ago

TI__Guru 62975 points

Robby,

Both address ranges are mapped to the same physical memory. The 0x008----- addresses are visible only to the DSP and are not visible by the rest of the device. The 0x118----- addresses are globally visible. Since they point to the same physical memory, you would be ok with just using the 0x118----- addresses.

You can find simple reference DSP examples including linker command files in the BIOS PSP package: http://software-dl.ti.com/dsps/dsps_public_sw/psp/BIOSPSP/index.html

In the install directory: \packages\ti\pspiom\cslr\evm6747\examples

-Tommy

0 RobbySun over 14 years ago in reply to tlee

Expert 1120 points

Thanks Tommy.

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C674x DSP mem map vs EDMA mem map ?