can only read/write 64 byte to SDRAM

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by Alex on Thu Oct 30 05:58:45 MST 2014

I did a board design with a LPC1778 and an ISSI IS42S16100E SDRAM.
unfortunately I missed to connect the correct bank address line to the SDRAM. I connected P4.11 of the LPC to A11 of the SDRAM but as it is the bank address I should have connected P4.13 instead.

Currently I don't manage to get any data exchanged with the SDRAM. My question is if this is a result of the wrong bank address or if it is something else.

I would expect that at least one bank is working.

I attached a source file with my initialization code.

EDIT: My test code is able to write 64 byte to SDRAM and read it back. If I try to write more data, nothing is written. Does it only seem to be working due to buffering or is it working but there is a problem with row switching?

Thank you in advance.

kind regards

Original Attachment has been moved to: board_lowlevel.c.zip