Wednesday, 6 August 2008

AHB Slave Shenanigans and Massive Modelsim Migranes

Setting up and running an ARM AMBA bus is not too tricky, and it is quite a neat standard. However in this case my student seems to have copied a rather cunning implementation from Gaisler Research's GRLIB. However the AMBA standard document seems to be rather inconsistent one one point: The HREADY signal is defined to be an input and an output for all AHB slaves, but for the life of me I can't find another mention of it, nor does it seem sensible. I shall consult Prof Flynn who is working here, as he developed AMBA and has worked with it for many years. If you are thinking of making your own GPL'ed AHB slave look no further than the Gaisler Research ahbram.vhd.

Modelsim and smartmodels (specifically the Rocket IO, MGT smartmodel). Good grief, this is a non-trivial procedure. Compile the models, install the models then make lots of opaque changes to the modelsim.ini file and it still doesn't work! Don't know why yet, but will post when I do.

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