# Any "low-level" AXI4-Lite read/write method (e.g. manipulating ARADDR/AWADDR) in PYNQ? **URL:** \ **Category:** Support\ **Created:** [August 31, 2023, 8:35am UTC](https://discuss.pynq.io/t/any-low-level-axi4-lite-read-write-method-e-g-manipulating-araddr-awaddr-in-pynq/6009 "2023-08-31T08:35:40Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![marvtao](https://avatars.discourse-cdn.com/v4/letter/m/85e7bf/32.png) [@marvtao](https://discuss.pynq.io/u/marvtao)\ **Post date:** [August 31, 2023, 8:35am UTC](https://discuss.pynq.io/t/any-low-level-axi4-lite-read-write-method-e-g-manipulating-araddr-awaddr-in-pynq/6009/1 "2023-08-31T08:35:40Z")
**PYNQ version & Board name & Tool Version:** - PYNQ: latest (3.0) - Board name: pynq-z2 (xc7z020clg400-1) - Tool version: Xilinx Vivado 2023.1 ![Screenshot from 2023-08-31 16-18-09](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/5/5f3449d59bbfd8c5e0d5209e38b5c900590a76bb.png) My design consists of a custom IP, with an AXI4-Lite compatible interface. I followed the tutorial and Vivado automatically connected the IP to the `M_AXI_GP0 of PS`. However, the IP directly takes the AWADDR/ARADDR as the control word or opcode. In order to control the IP, I need to use something like `device.write(addr, data)` or `device.read(addr)`，while the `pynq.axigpio` does not support read/write with an address. So my question is: 1. Does Pynq provide some kind of “low-level” API to manipulate the port-level signal for the interface over `M_AXI_GP0`? 2. Do other AXI ports support reading/writing with address, and how should I switch them? Thank you so much! Marv ---
**Author:** ![marioruiz](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/marioruiz/32/2177_2.png) [@marioruiz](https://discuss.pynq.io/u/marioruiz)\ **Post date:** [August 31, 2023, 9:11am UTC](https://discuss.pynq.io/t/any-low-level-axi4-lite-read-write-method-e-g-manipulating-araddr-awaddr-in-pynq/6009/2 "2023-08-31T09:11:09Z")
Hi @marvtao, Welcome to the PYNQ community. Check out the MMIO driver. [https://pynq.readthedocs.io/en/latest/pynq\_libraries/mmio.html](https://pynq.readthedocs.io/en/latest/pynq_libraries/mmio.html) Here is an example: [https://github.com/Xilinx/PYNQ\_Workshop/blob/master/Session\_4/2\_axi\_gpio.ipynb](https://github.com/Xilinx/PYNQ_Workshop/blob/master/Session_4/2_axi_gpio.ipynb) In genera, every AXI4-Lite IP in your design is assigned a MMIO driver by default. [https://pynq.readthedocs.io/en/latest/overlay\_design\_methodology/python\_overlay\_api.html](https://pynq.readthedocs.io/en/latest/overlay_design_methodology/python_overlay_api.html) So, you can do `.read(addr)` and `.write(addr, value)` Mario ---
**Author:** ![marvtao](https://avatars.discourse-cdn.com/v4/letter/m/85e7bf/32.png) [@marvtao](https://discuss.pynq.io/u/marvtao)\ **Post date:** [August 31, 2023, 9:48am UTC](https://discuss.pynq.io/t/any-low-level-axi4-lite-read-write-method-e-g-manipulating-araddr-awaddr-in-pynq/6009/3 "2023-08-31T09:48:21Z")
Thank you so much Mario! MMIO looks promising, but it requires the address must be the multiple of 4. I understand that MMIO is designed to align by word rather than by byte. But, are there any really fine grained low level APIs for manipulating such as AWVALID/AWADDR/WDATA ports? If no so, I have to modify the RTL to make the opcode multiple of 4, and do everything all over again😗 ---
**Author:** ![marioruiz](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/marioruiz/32/2177_2.png) [@marioruiz](https://discuss.pynq.io/u/marioruiz)\ **Post date:** [August 31, 2023, 10:44am UTC](https://discuss.pynq.io/t/any-low-level-axi4-lite-read-write-method-e-g-manipulating-araddr-awaddr-in-pynq/6009/4 "2023-08-31T10:44:46Z")
Hi @marvtao, There’s no finer granularity as the the M\_AXI\_GP0 is 32-bit wide. Mario ---
**Author:** ![marvtao](https://avatars.discourse-cdn.com/v4/letter/m/85e7bf/32.png) [@marvtao](https://discuss.pynq.io/u/marvtao)\ **Post date:** [August 31, 2023, 11:57am UTC](https://discuss.pynq.io/t/any-low-level-axi4-lite-read-write-method-e-g-manipulating-araddr-awaddr-in-pynq/6009/5 "2023-08-31T11:57:09Z")
Thank you for this precious information. Now I’m much assured about what I’m going to do next. Marv ---
**Author:** ![marioruiz](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/marioruiz/32/2177_2.png) [@marioruiz](https://discuss.pynq.io/u/marioruiz)\ **Post date:** [August 31, 2023, 1:20pm UTC](https://discuss.pynq.io/t/any-low-level-axi4-lite-read-write-method-e-g-manipulating-araddr-awaddr-in-pynq/6009/6 "2023-08-31T13:20:09Z")