Problems with ALTASMI_PARALLEL megafunction

Found it!

If I change the mapping rden => '0' to rden => '1' the registers are all preserved. The documentation is a bit confusing, the online help in the MegaWizard Plugin Manager says that rden should be held high to continue reading sequential addresses, but app note AN379 figure 2 implies that the read operation will terminate immediately if rden is driven low.

It's nearly working, doesn't meet timing at the moment when driven with the main 32MHz clock used elsewhere in the design. It looks like I need to divide this clock in half and use it as asmi_clk_in, then re-sync all the signals coming to / from the ASMI function.