Integrate the Opencores's I2C ip into SOPC

Hello:

I gathered 2 messages about how to integrate Opencores's I2C IP into SOPC.

And I just have got it work by following these instructions below. But one note

is that you can not just include the header file "oc_i2c_master.h" directly.

Please refer to Altera's application note "AN333" to wirte your own header file.

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you can easily connect the I2C Wishbone core to the NIOS processor

1. Within SOPC builder, generate interface to user logic.

2. Select bus interface type: avalon register slave.

3. Add "i2c_master_top.v" design file.

4. Read port list from file.

5. Connect the signals as follow:

wb_adr_i <=> address

wb_dat_i <=> writedata

wb_dat_o <=> readdata

wb_we_i <=> write

wb_stb_i <=> chipselect

wb_cyc_i <=> chipselect

wb_inta_o <=> irq

wb_clk_i <=> clk

wb_ack_o <=> waitrequest_n

wb_rst_i <=> always0

arst_i <=> reset_n

scl_pad_i <=> export

scl_pad_o <=> export

scl_padoen_o <=> export

sda_pad_i <=> export

sda_pad_o <=> export

sda_padoen_o <=> export

6. Under timing tab, leave the setup, wait and hold settings at 0 cycles.

You can now access the I2C core via included "oc_i2c_master.h".

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Original message is written by "Guido Kuhlmann" from the Opencores forum.

reference from: (http://www.opencores.org/forums.cgi/cores/2004/04/000609)

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If you have integrated the I2C IP from Opencores into your system correctly there are only some more steps to bring it to work.

1. Insert -> Symbol ...

2. 2x primitives -> buffer -> tri

3. 2x primitives -> logic -> not

4. 2x primitives -> pin -> bidir

5. connect "scl_padoen_o" and "sda_padoen_o" to the input of the "not"-logics

6. connect "scl_pad_o" and "sda_pad_o" to the input of the "tri"-buffers

7. connect the output of the "not"-logics to the corresponding output-enables of the "tri"-buffers

8. name the output of the "tri"-buffers "i2c_scl" and "i2c_sda"

9. connect "i2c_scl" and "i2c_sda" to the corresponding inputs of the I2C IP

10. connect "i2c_scl" and "i2c_sda" to "bidir"-pins

That&#39;s it!

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Original message is written by "niosIIuser" from the Nios forum.

reference from : (here (http://www.niosforum.com/forum/index.php?act=st&f=2&t=590&hl=opencore))

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