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Discussion Groups | Analog Devices DSPs | 21065L overlay memory

Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).

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21065L overlay memory - Keld Hammerum Andersen - Jul 26 13:00:00 2001

Hi guys, I am trying to use external memory overlays for my 21065L project. I have used the overlay manager supplied with the ADSP tools and I have designed my ldf file using the guidelines outlined in the linker manual. However, I can´t get it going! Do any of you have a project that uses memory overlays? I am very interested in an example ldf file and maybe some sources files for the project - preferrably asm as well as C files. Thanks in advance Keld Hammerum Andersen DSP Engineer, Ekko Dane A/S, Denmark

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Re: 21065L overlay memory - Kannan Subranian - Jul 26 13:59:00 2001

Hi The Overlay mansger supplied by AD has a draw back. This overlay manager initiates a DMA for transfering an overlay from EX. mem to int. mem. and waits for the DMA completion interrupt in an idle instruction.If any other interrupt (if you use one in your system) goes off in this period, overlay manager comes out of the idle indtruction and cause problems.Try converting this interupt mode into polling mode (ie. monitor DMAC reg. for the DMA completion rather than waiting for the DMA interrupt.) Hope this helps cheers kannan >>> Keld Hammerum Andersen <> 07/26/01 02:00pm >>> Hi guys, I am trying to use external memory overlays for my 21065L project. I have used the overlay manager supplied with the ADSP tools and I have designed my ldf file using the guidelines outlined in the linker manual. However, I can t get it going! Do any of you have a project that uses memory overlays? I am very interested in an example ldf file and maybe some sources files for the project - preferrably asm as well as C files. Thanks in advance Keld Hammerum Andersen DSP Engineer, Ekko Dane A/S, Denmark _____________________________________ /groups.php3