niosii + sdram connection problems

Hello

I have a custom board where I 'm using a Cyclone EP1C6Q240C8N device, that has on board an external SRAM (16bits), ADC (16bits), and 2 DACs (16 bits) these devices share the data bus (16bits). My questions are the following:

Can I share the 16 bit bus with the above mentioned devices when I'm using the Sram to store the NIOS II program?

Has anybody has done something like this and have an example or at least

point me in the right direction?

I tried to make a custom SRAM component with tristated interface for SOPC builder but Nios does not recognized it, here is the component HDL.

module SRAM(

// Host Data

CSn,

OEn,

Wn,

Address,

BEn,

Data,

// SRAM

SRAM_CSn,

SRAM_OEn,

SRAM_Wn,

SRAM_Address,

SRAM_BEn,

SRAM_Data

);

// Host Side

input CSn;

input OEn;

input Wn;

inout [15:0] Data;

input [18:1] Address; // Altera documentation for external devices

input [1:0] BEn;

// SRAM Side

output SRAM_CSn;

output SRAM_OEn;

output SRAM_Wn;

inout [15:0] SRAM_Data;

output [17:0] SRAM_Address;

output [1:0] SRAM_BEn;

assign SRAM_Data = SRAM_Wn ? 16'hzzzz : Data;

assign Data = SRAM_Data;

assign SRAM_Address = Address;

assign SRAM_Wn = Wn;

assign SRAM_OEn = OEn;

assign SRAM_CSn = CSn;

assign SRAM_BEn = BEn;

endmodule

thanks in advance.