User Logic interfacing?

I'm just starting to try to integrate some user logic with a NiosII core. I have read round this

quite a bit, including searching here but still have a few questions.

I have the following interfaces at the top of my module that I need the CPU to be able to read and

write to..

din : in std_logic_vector(15 downto 0); -- writedata

wr : in std_logic; -- write

op_enable : in std_logic; -- writedata

op_polarity : in std_logic; -- writedata

int_en : in std_logic; -- writedata

empty_flag : out std_logic; -- readdata

empty_intrpt : out std_logic; -- irq

buffer_size : out std_logic_vector(9 downto 0) -- readdata

I have tried integrating this using the 'Interface to User Logic' Legacy component, defining each interface as above.

I have 6 read or write elements, but when SOPC builder created the component it only allocated 4 addresses

for the component.

Has it lumped ports into the same address? (As an aside, I presume it's more efficient for me to concatenate

signal lines internally and provide fewer interface ports allowing the SW to identify the relevant bits).

How do I know what's been allocated to which address?

I'd like the interrupt to be edge triggered. When adding a PIO port you're given the option to select how the

interrupt is raised. How is this defined for user logic?

Thanks for any help with this, the documentation covering this doesn't seem clear and consise, and what

there is is scattered far and wide (cue someone to post a link to an easily found idiots guide to user

logic interfacing).

Nial.