DM8148 Support Registers

Brad Griffis

In the memory map I see numerous references to "Support Registers". It seems every peripheral has "support registers". What registers are these? I see no other references to "support registers" in the data sheet or TRM. Please clarify.

over 14 years ago

0 MarcPyne over 14 years ago

TI__Mastermind 25055 points

Brad,

The support registers are L3/L4 registers which are not part of the Peripheral IP but are related to the port that the IP is connected to.

Regards,
Marc

0 Brad Griffis over 14 years ago in reply to MarcPyne

TI__Guru*** 125430 points

Can you tell me a few register names and/or point me to the appropriate chapter in the DM8148 TRM? I have a better idea of what you're saying but I'm still not entirely clear.

0 MarcPyne over 14 years ago in reply to Brad Griffis

TI__Mastermind 25055 points

Brad,

The TRM is a work in progress, so I'm not sure if the registers are included yet. We'll have to check.

Regards,
Marc

0 Viet Dinh over 14 years ago in reply to MarcPyne

TI__Genius 15310 points

Brad,

Could you tell us which memory map you are referred to and where you get it? Just want to know exactly which one you are looking at.

Regards,

Viet

0 Brad Griffis over 14 years ago in reply to Viet Dinh

TI__Guru*** 125430 points

I'm looking in the latest data manual, sprs647a, at Section 2.12.3 "L4 Memory Map".

0 RandyP over 13 years ago in reply to Brad Griffis

TI__Guru* 84110 points

Brad,

Did you ever find out what the "Support Registers" are?

Viet, Marc,

The address range starting at 0x48029 (I2C0 Support Registers) appears in the DM8168 memory map in the evm816x.gel file but this address range does not seem to be used for any commands in the gel file.

Could we ask one of the IP owners for any one of the several IP blocks?

Regards,
Randy

0 Brad Griffis over 13 years ago in reply to RandyP

TI__Guru*** 125430 points

All I've been able to determine is that the "support registers" are really tied into the interconnect. In other words, if you see something like "I2C0 support registers" it's really referring to registers in the interconnect for the port connected to the I2C. The only place I've seen any documentation related to this feature is in the OMAP4 TRM. You can find a public TRM for the OMAP4460 here. Chapter 13 discusses the interconnect. If you go to Section 13.3.5 "L4 Interconnects Register Manual" you'll notice immediately how similar the setup is to what you're seeing in DM814x/DM816x, i.e. everything is a 4KB section.

0 Brad Caldwell over 13 years ago in reply to Brad Griffis

TI__Genius 12595 points

Brad,

I just went through the same thing myself, read the L4 memory map section of the datasheet and scratched my head wondering what these support register are. I hope TI gets this clarifid in the TRM. Anyways, the reason I'm replying is, do you know if I should be worried about these registers as far as needing to configure them or are the reset defaults sufficient?

Thanks

0 Brad Griffis over 13 years ago in reply to Brad Caldwell

TI__Guru*** 125430 points

You shouldn't need to touch these registers for things to work.

Processors

Processors forum

DM8148 Support Registers