hey,
i needed a ddr sdram controller for a MT46V16M16 so when i saw the IPCORE on OpenCores.org i thought why not use it ... so i have build all the necessary controlling processes and blocks and simulated it and tried it out on a virtexII FPGA and worked fine, then i connected the DDR controller to it at i got this HUGE list of warnings about unconnected elements. (i attached it to this message for the curious one among you) and i was just wondering if other people already had this problem and maybe solved them... any help is welcome ...
thanx in advance,
kind regards,
yttrium
P.S. this is just on part of the project: in this part data has to come from a pc through uart towards RAM and the on VGA/PAL (all the necessary parts for this part have been done and tested, so only the ram controller fails to do his job ;-) ...)
P.P.S. just found out that this newsgroup will not accept attachements from me ;-)
INFO:Xst:1317 - HDL ADVISOR - A dynamic shift register was found for signal and currently occupies 2 logic cells (1 slices) for the flip-flop chain and additional logic cells for the multiplexer. Removing the set/reset logic would take advantage of SRL16 (and derived) primitives and reduce this to 1 logic cells (1 slices). Evaluate if the set/reset can be removed for this simple shift register. The majority of simple pipeline structures do not need to be set/reset operationally. INFO:Xst:1317 - HDL ADVISOR - A dynamic shift register was found for signal and currently occupies 2 logic cells (1 slices) for the flip-flop chain and additional logic cells for the multiplexer. Removing the set/reset logic would take advantage of SRL16 (and derived) primitives and reduce this to 1 logic cells (1 slices). Evaluate if the set/reset can be removed for this simple shift register. The majority of simple pipeline structures do not need to be set/reset operationally. INFO:Xst:1317 - HDL ADVISOR - A dynamic shift register was found for signal and currently occupies 2 logic cells (1 slices) for the flip-flop chain and additional logic cells for the multiplexer. Removing the set/reset logic would take advantage of SRL16 (and derived) primitives and reduce this to 1 logic cells (1 slices). Evaluate if the set/reset can be removed for this simple shift register. The majority of simple pipeline structures do not need to be set/reset operationally. INFO:Xst:1317 - HDL ADVISOR - A dynamic shift register was found for signal and currently occupies 2 logic cells (1 slices) for the flip-flop chain and additional logic cells for the multiplexer. Removing the set/reset logic would take advantage of SRL16 (and derived) primitives and reduce this to 1 logic cells (1 slices). Evaluate if the set/reset can be removed for this simple shift register. The majority of simple pipeline structures do not need to be set/reset operationally.
and
WARNING:Xst:1291 - FF/Latch is unconnected in block . WARNING:Xst:1291 - FF/Latch is unconnected in block . WARNING:Xst:1291 - FF/Latch is unconnected in block . WARNING:Xst:1291 - FF/Latch is unconnected in block .
and
WARNING:Xst:1710 - FF/Latch (without init value) is constant in block . WARNING:Xst:1710 - FF/Latch (without init value) is constant in block .
are some of the warnings i get from the controller