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Hello, I am doing IDMA reading and writting on an ADSP-2189N, revision 3.2 When writting, which I use for boot up from a host PC via a microcontroller, everything goes fine, which I can verify by means of the 218x-EzICE. But when reading the contents of PM or DM I get strange results, spuriously. The data and code is all in overlay 0, I make sure to do so with an Overlay Latch cycle when writting (the emulator helps me to make sure that it worked). For reading I also set to overlay 0 before writting the starting address from where I want to start reading. But for some accesses the IDDMOVLAY and IDPMOVLAY fields in the IDMA Overlay register change to 0xF or something different than 0x0, so I get wrong results with my readings. I double-checked and no address or overlay latch cycles are being generated, which could cause this strange behavior. IAL is kept low, and /RD is being asserted by the micro as well as /IS, while /WR is clean "1". I reviewed the anomaly list for rev 3.2 and nothing was stated concerning IDMA. I say it again: the trouble arises only for accessing some addresses, in a certain order, but I haven't been able to discover a pattern which I could reproduce and expose here. I am confident that many people here are experts with these chips, like Leon Heller and Al Clark, just to mention two of you. So I hope I can have your valuable advice on how to make my readings bulletproof. Kindest regards, -- Jaime Andr Aranguren Cardona SanJaaC Electronics Soluciones en DSP www.sanjaac.com __________________________________________________ |
ADSP-2189N IDMA
Started by ●November 19, 2004
