External SDRAM doesn't work on 96kHz...

Question

hi.... 
 when I link my project (reverberation via SIMULINK embedded IDE link) it works fine on 48kHz, but when I try it on 96kHz it only talks thru... 
 thats why the data section for reverberation is on SDRAM....because for internal on-chip memory it is too large.. 
 an other problem is that I try hard to flash the project....I use the default PROM > hex > 8bit > .ldr and flash it with the flash programmer successful...but it don't consider the SDRAM 
 see attachment for linker file..............

EZAdministrator · Accepted Answer

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EZ Admin

ADIApproved · Answer

Hi, 
 Can I ask you for some further details. You say that the application doesn't apply the reverberation when you place the reverb data on SDRAM - is this the case both when you run the application as a DXE, and when you try to boot the loader file? 
 Does the same problem occur when using 48kHz if you place this data in SDRAM also? You can use the "#pragma section()" directive to force your data into SDRAM by doing something like the following in your code: 
 #pragma section ("myData") 
 int reverbData[10000] = {...}; 
 then in the LDF: 
 sec_sdram_32bit 
 
 { 
 
 INPUT_SECTIONS( $OBJECTS(seg_dmda) $LIBRARIES(seg_dmda)) 
 INPUT_SECTIONS( $OBJECTS(myData)) 
 
 } >MEM_sdram_32bit 
 
 I believe from your other posts that you are using the 21369 EZ-KIT Lite. For this reason, I would recommend taking a look at the readme file for the Power On Self Test example, located in "...\213xx\Examples\ADSP-21369 EZ-KIT Lite\", which describes the steps to configure a loader file for this target. Note that you have to associtate the boot kernel file, 36x_prom.dxe with the Loader File in the project options. 
 This boot kernel takes care of configuring the sdram, in "...\213xx\ldr\36x_prom\369_prom.asm\", from line 449 onwards.

ADIApproved · Answer

Hi, 
 It looks like your project links against some Matlab resources which I do not have on my PC, so I cannot build this application. As the 48kHz sampling rate uses SDRAM also, I believe we can rule out any problems with your project configuration causing the problem. Unfortunately, I cannot comment on whether it is a possibility for the SDRAM to be too slow for your application to work at 96kHz, however perhaps someone else on the forum may be able to offer further insight. 
 regards, 
 Craig.