Part 1: First project using a SHARC, 21261, Some Questions.

Hi all

I'm still fairly new around here and new to the SHARC platform as a whole, so recently I started a fairly ambitious DSP project after reading through literately tons of SHARC material, I think I'm finally comfortable to start development.

I'm basically interested in building, not buying, a small SHARC 100mmx100mm audio 4-layer board for "basic" Audio DSP research using a SHARC-21261 150MHz processor, Also my goal is, after obtaining success with this board, it will be a run up to a more powerful SHARC 21489 self developed board, for now.. I wanted to keep things simple, also note im using the sharc 21261 EZ-BOARD as a hardware guide to reduce the error rate as the waters are deep and it feels like  im "swimming with sharcs"

http://www.analog.com/media/en/dsp-documentation/evaluation-kit-manuals/ADSP-21262_ezkit_man_rev.3.2.pdf

My objective for this project is as follows. 

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* To obtain knowledge on an how to layout a SHARC DSP board, I'm using Altium Designer.

* Get a basic level of understanding on how the SHARC platform works (both hardware and software)

* How to program DSP code, perform processing, debug using CCS using ADSP JTAG hardware.

* How build and load binaries to the SPI flash memory.

My first question

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1) How much external SRAM memory is required for multichannel audio processing using a SHARC-21261 ? ( 6-channels of audio at the highest sample rate)...

2) Attached is progress of the board, thus far I have the power supply section completed which consists of a 5V and local regulators 3.3v and 1.2V on a 4 layer board.  

Thank you in advance,

Parents
  • Hi AlClark

    After a week of learning Alitum PCB layout techniques for the switching regulator im using and looking for 3D bodies to get the exact representation of geometry, this was the result. thanks! 

    Now, I feel its a bit too late, as I already made the purchase for X2 21261 LQFP processors it cost  $60 for two (they sitting on my desk), I bought 2 processors, just in case I damage one of them (21489 cost like $40 each, ouch), I then do have a spare backup, pity AD doesn't sample SHARC processors.(maybe some here from AD can send me some 21489? to play with)  Anyway, so I'm stuck with x2 unused processors, and forced to use them, maybe next time I will design a another board using the 21489, for now, its just pure experience and nothing really series.. (not yet)


    Regarding memory question, the ADSP-21261 has RAM of 1M bit, ROM of 3M bit, x4 SPORTs,

    If the answer to the question is still limited, maybe I should just follow the ez-kit layout its got a single external SRAM of 4Mb (512K x 8-bit) TSOP44 IS61LV5128AL, and  A SPI Flash of 2Mb M25P20 SOIC8 (which im going to use).


    If and when I make a decision on the memory choice I can start working on the signal layer routing this week.

    You are very knowledgeable in this area, and I've heard Paul Beckmen from DSP concepts (youtube) on a few videos speak highly about your companies experience on this platform.

    Thanks for the reply.

Reply
  • Hi AlClark

    After a week of learning Alitum PCB layout techniques for the switching regulator im using and looking for 3D bodies to get the exact representation of geometry, this was the result. thanks! 

    Now, I feel its a bit too late, as I already made the purchase for X2 21261 LQFP processors it cost  $60 for two (they sitting on my desk), I bought 2 processors, just in case I damage one of them (21489 cost like $40 each, ouch), I then do have a spare backup, pity AD doesn't sample SHARC processors.(maybe some here from AD can send me some 21489? to play with)  Anyway, so I'm stuck with x2 unused processors, and forced to use them, maybe next time I will design a another board using the 21489, for now, its just pure experience and nothing really series.. (not yet)


    Regarding memory question, the ADSP-21261 has RAM of 1M bit, ROM of 3M bit, x4 SPORTs,

    If the answer to the question is still limited, maybe I should just follow the ez-kit layout its got a single external SRAM of 4Mb (512K x 8-bit) TSOP44 IS61LV5128AL, and  A SPI Flash of 2Mb M25P20 SOIC8 (which im going to use).


    If and when I make a decision on the memory choice I can start working on the signal layer routing this week.

    You are very knowledgeable in this area, and I've heard Paul Beckmen from DSP concepts (youtube) on a few videos speak highly about your companies experience on this platform.

    Thanks for the reply.

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