DM8168 Powering Off A8 Processor

ler

Hello,

We are interested in the DM8168 processor. We might have an occasion when we wish to have the A8 turned completely off and just use the DSP. Is this possible?

Where would the control for this be located in the part.

Thank you.

LER

over 10 years ago

0 Pavel Botev over 10 years ago

TI__Guru**** 170625 points

I am moving this to the DM816x forum.

0 Pavel Botev over 10 years ago

TI__Guru**** 170625 points

Ler,

Cortex-A8 ARM can not be power OFF while leaving rest of the system ON. A8 ARM belongs to the Always ON power and voltage domain. Always ON power domain is never transitioned from the ON power state.

See the below resources regarding power management:

DM816x TRM, chapter 3 Power Management and chapter 18 PRCM

processors.wiki.ti.com/.../TI81XX_PSP_User_Guide

http://processors.wiki.ti.com/index.php/DM816x_C6A816x_AM389x_Power_Estimation

BR
Pavel

0 ler over 10 years ago in reply to Pavel Botev

Expert 1070 points

Pavel,

Is it possible to talk to the various I/O pieces without the ARM processor (and Linux) involved? In other words, do libraries exist for the DSP that would all for functions like Ethernet, serial communications, etc? We are trying to minimize our initial software development time and the number of processors we are trying to interact with. Then, as time permits, move to the ARM and its environment.

Thank you.

LER

0 Pavel Botev over 10 years ago in reply to ler

TI__Guru**** 170625 points

Ler,

I think this should be possible. See DM816x datasheet, C674x DSP has its own memory map with specific addresses to access IO. See sections 3.9 Memory Map, 3.9.5 C674x Memory Map

You can use RTOS, not Linux HLOS. See the below links:

processors.wiki.ti.com/.../AM389x_C6A816x_DM816x_Software_Design_Guide
www.ti.com/.../toolssoftware - see TI-RTOS and DSPLIB

BR
Pavel

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DM8168 Powering Off A8 Processor