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ADV7842 SDR SDRAM Memory Test

Question asked by Ginux on Apr 30, 2015
Latest reply on Mar 4, 2016 by Ginux



I have a problem with the memory test on my board. When I follow this document:


The test finished with at least one error because the error flag is set to '1'.


I'm using an ADV7842 and a SDR SDRAM ( IS42S16400J-6BL ) [1 Meg Bits x 16 Bits x 4 Banks (64-MBIT)].


My board seems to be ok, I checked the connexions more than twice...


I followed the instruction order from the document ( HW reset -> Document Instructions), it failed.


I tried with some more configuration before launching the test (HW reset -> I2C@ setting in main bloc -> "My instruction list" [details below] -> Document Instructions ).


In all cases, I checked the signals between the ADV and the SDRAM and the level of signal are ok.


Does anyone have an idea of why this test is'nt working?






"My instruction list" :


Write (SDP_IO, 0x75, 0xE6)

Write (SDP_IO, 0x74, 0x00)

Write (SDP_IO, 0x79, 0x33)

Write (SDP_IO, 0x60, 0x01)

Write (SDP_IO, 0x7A, 0xA5)

Write (SDP_IO, 0x7B, 0x8F)

Write (SDP_IO, 0x75, 0x01)