Update README.md

Add GPIO interrupt table

README.md

@@ -1,6 +1,6 @@
 # X300
 
-This repository contains the hardware design source files of the Hex Five X300 RISC-V SoC. The X300 SoC is Hex Five's official reference platform for its [MultiZone Security Trusted Execution Environment](https://github.com/hex-five/multizone-sdk) and [MultiZone Security Trusted Firmware](https://github.com/hex-five/multizone-iot-sdk). The X300 is an enhanced secure version of the - now archived - [SiFive's Freedom E300 Platform](https://github.com/sifive/freedom) built around the RISC-V Rocket chip originally developed at U.C. Berkeley.
+This repository contains the hardware design source files of the Hex Five X300 RISC-V SoC. The X300 SoC is Hex Five's official reference platform for its [MultiZone Security Trusted Execution Environment](https://github.com/hex-five/multizone-sdk) and [MultiZone Security Trusted Firmware](https://github.com/hex-five/multizone-iot-sdk). The X300 is an enhanced secure version of the [SiFive's Freedom E300 Platform](https://github.com/sifive/freedom) built around the RISC-V Rocket chip originally developed at U.C. Berkeley.
 
 Feature comparison between E300 (not secure) and X300 (secure):
 
@@ -21,7 +21,7 @@ Like the Freedom E300 Arty FPGA Dev Kit, the X300 is designed to work with the [
 
 ### Bootrom & Trusted Firmware
 
-The default bootrom consists of a program that immediately jumps to address 0x20400000, which is 0x400000 bytes into the SPI flash memory on the Arty board. The default bitstream files include no other firmware. A fully functional state-of-the-art trusted firmware stack for this device is available at https://github.com/hex-five/multizone-iot-sdk and included pre-built in the alternative bitstreams [multizone-iot-sdk-arty-35t.mcs](https://github.com/hex-five/multizone-fpga/releases/download/v2.0.0/multizone-iot-sdk-arty-35t.mcs) and [multizone-iot-sdk-arty-100t.mcs](https://github.com/hex-five/multizone-fpga/releases/download/v2.0.0/multizone-iot-sdk-arty-100t.mcs).
+The default bootrom consists of a program that immediately jumps to address 0x20400000, which is 0x400000 bytes into the SPI flash memory on the Arty board. The default bitstream files include no other firmware. A fully functional state-of-the-art trusted firmware stack for this device is available at https://github.com/hex-five/multizone-iot-sdk including pre-built bitstreams for ARTY 35T and ARTY 100T.
 
 ### Quick Start
 
@@ -30,7 +30,7 @@ Prebuilt bitstream files are provided as release assets ready to download and pr
 - [X300ArtyA7-35T.mcs](https://github.com/hex-five/multizone-fpga/releases/download/v2.0.0/X300ArtyA7-35T.mcs)
 - [X300ArtyA7-100T.mcs](https://github.com/hex-five/multizone-fpga/releases/download/v2.0.0/X300ArtyA7-100T.mcs)
 
-If you don't need to modify the hardware design, you can skip the next sections and jump directly to the [Program](#program) section.
+If you don't intend to modify the design of the hardware, you can skip the next sections and jump directly to the [Program](#program) section.
 
 ## Requirements
 
@@ -92,3 +92,39 @@ To program the SPI flash with Vivado:
 - Select OK
 - Once the programming completes in Vivado, press the “PROG” Button on the Arty board to
 load the image into the FPGA
+
+## Appendix - GPIO interrupts table
+| GPIO | ARTY CONNECTION | CLINT IRQ | PLIC IRQ |
+| -----| ----------------| --------- | -------- |
+|    0 | IO8             |           |       22 |
+|    1 |                 |           |          |
+|    2 |                 |           |          |
+|    3 |                 |           |          |
+|    4 | IO12            |           |       26 |
+|    5 | IO13            |           |       27 |
+|    6 |                 |           |          |
+|    7 |                 |           |          |
+|    8 | PMODA [1]       |           |       30 |
+|    9 | PMODA [2]       |           |       31 |
+|   10 | PMODA [3]       |           |       32 |
+|   11 | PMODA [4]       |           |       33 |
+|   12 |                 |           |          |
+|   13 |                 |           |          |
+|   14 |                 |           |          |
+|   15 | BTN0            |        16 |       37 |
+|   16 |                 |           |          |
+|   17 |                 |           |          |
+|   18 | IO02            |           |       40 |
+|   19 |                 |           |          |
+|   20 | IO04            |           |       42 |
+|   21 |                 |           |          |
+|   22 |                 |           |          |
+|   23 | IO07            |           |       45 |
+|   24 |                 |           |          |
+|   25 |                 |           |          |
+|   26 |                 |           |          |
+|   27 |                 |           |          |
+|   28 |                 |           |          |
+|   29 |                 |           |          |
+|   30 | BTN1            |        17 |       52 |
+|   31 | BTN2            |        18 |       53 |