Welcome to the Audio Converters Section of the TI E2E Support Community. Ask questions, share knowledge, explore ideas, and help solve problems with fellow engineers. To post a question, click on the forum tab then "New Post".
I. When a miniDSP is powered off:
Its C-RAM (or coefficient memory) can be accessed by the control bus. The miniDSP does not have access to C-RAM.
Its I-RAM (or instruction memory) can be accessed by the control bus. The miniDSP does not have access to I-RAM.
II. When a miniDSP is powered up (non-adaptive mode):
Its C-RAM can be accessed by the miniDSP. The control bus does not have access to C-RAM (reading the registers return 0x00).
Its I-RAM can be accessed by the miniDSP. The control bus does not have access to I-RAM (reading the registers return 0x00).
III. When a miniDSP is powered up (adaptive mode):
One of the C-RAM buffers can be accessed by the miniDSP. The control bus has access to the other C-RAM buffer.
Applying a software or hardware /RESET clears C-RAM to default and resets all other registers. I-RAM remains as programmed until power is removed.
Having said the above, C-RAM is shared with both miniDSP and PRB modes. I-RAM is unrelated to the PRB modes and only applies to miniDSP mode. The user can program I-RAM beforehand, use PRB mode and then switch to miniDSP mode. However, the DACs and ADCs must be powered off before switching.
Additionally, C-RAM should be programmed each time with the correct data according to each mode (PRB or miniDSP). A software reset will set C-RAM coefficients automatically for PRB modes.
For more details on C-RAM access refer to: http://focus.ti.com/lit/an/slaa425b/slaa425b.pdf
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.