Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Qsys problem in connecting Avalon-MM master and slave with different symbol widths

hi, i cannot connect avalon-mm master with a symbol width of 8 and avalon-mm slave with a symbol width of 9. i am trying to connect a 128-bit width master with 8-bit symbol of a clock crossing ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

I should mention that in Qsys, different cores have different data widths. The interconnexion between different widths is achieved by an Altera predefined element called Merlin Width Adapter. This element will simply not be synthesizable because it can only perform alignment between data widths within (16, 32, 64, 128, 256) at least as it seems to :)

You can check the source code for Merlin Width Adapter which appears to be written in system verilog and you will understand why you need a power of 2 data width.