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A read enable isn't present in the RAM/ROM hardware...
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The Cyclone III device handbook says this:
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The ROM read operation is identical to the read operation in the single-port RAM configuration.
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The single-port RAM figure shows both a clock enable and read enable available, although I saw only clock enable in the "ROM: 2-PORT" MegaWizard.
Despite the handbook statement giving me the impression that a ROM can't be dual port, I did successfully implement the dual-port ROM without enable using an inferred memory and the dual-port ROM with enable using the MegaWizard with the clock enable selected.
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