[Libre-soc-bugs] [Bug 450] Create MMU from microwatt mmu.vhdl

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=450

--- Comment #7 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
 572 #           rts := unsigned('0' & pgtbl(62 downto 61) & pgtbl(7 downto
5));
 573             # rts == radix tree size, number of address bits being
translated
 574             comb += rts.eq((0 & pgtbl[61:63] & pgtbl[5:8]).as_unsigned())
 575 

this is a Cat like i explained in the earlier comment.  you swap the order of
the things separated by & but DO NOT swap the order of bits in the const.

    x'1243' & foo

becomes

     Cat(foo, Const(0x1243, 16))

and

     '0111' & bar

becomes

    Cat(bar, Const(0b0111, 4))

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