```
  Riscduino Single Risc Core SOC


Permission to use, copy, modify, and/or distribute this soc for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOC IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOC INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOC.
```

# Table of contents
- [Overview](#overview)
- [Riscduino Block Diagram](#Riscduino-block-diagram)
- [Key Feature](#key-features)
- [Riscduino derivatives](#riscduino-derivatives)
- [MPW Shuttle on Riscduino](#mpw-shuttle-on-riscduino)
- [Sub IP Feature](#sub-ip-features)
- [SOC Memory Map](#soc-memory-map)
- [Pin Mapping](#soc-pin-mapping)
- [Repository contents](#repository-contents)
- [Prerequisites](#prerequisites)
- [Tests preparation](#tests-preparation)
    - [Running Simuation](#running-simulation)
- [Tool sets](#tool-sets)
- [News](#news)
- [Contacts](#contacts)
- [How To Contribute](#how-to-contribute)
- [Documentation](#documentation)


# Overview

Riscduino is a Single 32 bit RISC V based SOC design pin compatible to arudino platform and this soc targetted for efabless Shuttle program.  This project uses only open source tool set for simulation,synthesis and backend tools.  The SOC flow follow the openlane methodology and SOC environment is compatible with efabless/carvel methodology.

# Riscduino Block Diagram

<table>
  <tr>
    <td  align="center"><img src="./docs/source/_static/Riscduino_Soc.png" ></td>
  </tr>

</table>


# Key features
```
    * Open sourced under Apache-2.0 License (see LICENSE file) - unrestricted commercial use allowed.
    * Dual 32 Bit RISC-V core
    * 2KB SRAM for instruction cache 
    * 2KB SRAM for data cache
    * 2KB SRAM for Tightly coupled memory - For Data Memory
    * Quad SPI Master with 4 Chip select, supports both SPI flash and SRAM interface
    * 2 x UART with 16Byte FIFO
    * USB 1.1 Host
    * I2C Master
    * UART Master
    * Simple SPI Master with 4 Chip select
    * 6 Channel ADC (in Progress)
    * 6 x PWM
    * 3 x Timer (16 Bit), 1us/1ms/1second resolution
    * Pin Compatbible to arudino uno
    * Wishbone compatible design
    * Written in System Verilog
    * Open-source tool set
       * simulation - iverilog
       * synthesis  - yosys
       * backend/sta - openlane tool set
    * Verification suite provided.
```

# Riscduino derivatives

<table>
  <tr>
    <td  align="center"><img src="./docs/source/_static/Riscduino-derivatives.png" ></td>
  </tr>

</table>

# MPW Shuttle on Riscduino 

<table>
  <tr>
    <td  align="center"> MPW</td> 
    <td  align="center"> Tape-out</td>
    <td  align="center"> Project Name</td>
    <td  align="center"> Project Details</td>
    <td  align="center"> Github</td>
    <td  align="center"> Efabless</td>
  </tr>
  <tr>
    <td  align="center"> MPW-2 </td> 
    <td  align="center"> 18-June-2021  </td>
    <td  align="center"> YiFive</td>
    <td  align="center"> Single 32bit RISCV core without cache + SDRAM Controller + WB Interconnect</td>
    <td  align="center"> <a href="https://github.com/dineshannayya/yifive">Link</a></td>
    <td  align="center"> <a href="https://platform.efabless.com/projects/152">Link</a></td>
  </tr>
  <tr>
    <td  align="center"> MPW-3 </td> 
    <td  align="center"> 15-Nov-2021  </td>
    <td  align="center"> Riscduino</td>
    <td  align="center"> Single 32bit RISCV core without cache + Onchip SRAM + WB Interconnect</td>
    <td  align="center"> <a href="https://github.com/dineshannayya/riscduino">Link</a></td>
    <td  align="center"> <a href="https://platform.efabless.com/projects/385">Link</a></td>
  </tr>
  <tr>
    <td  align="center"> MPW-4 </td> 
    <td  align="center"> 31-Dec-2021  </td>
    <td  align="center"> Riscduino-R1</td>
    <td  align="center"> Single 32bit RISCV core with cache + Onchip SRAM + WB Inter Connect</td>
    <td  align="center"> <a href="https://github.com/dineshannayya/riscduino">Link</a></td>
    <td  align="center"> <a href="https://platform.efabless.com/projects/575">Link</a></td>
  </tr>
  <tr>
    <td  align="center"> MPW-5 </td> 
    <td  align="center"> 21-Mar-2022  </td>
    <td  align="center"> Riscduino-SCORE</td>
    <td  align="center"> Single 32bit RISCV core with cache + Onchip SRAM+ WB Cross Bar</td>
    <td  align="center"> <a href="https://github.com/dineshannayya/riscduino">Link</a></td>
    <td  align="center"> <a href="https://platform.efabless.com/projects/670">Link</a></td>
  </tr>
  <tr>
    <td  align="center"> MPW-5 </td> 
    <td  align="center"> 21-Mar-2022  </td>
    <td  align="center"> Riscduino-DCORE</td>
    <td  align="center"> Dual 32bit RISCV core with cache + Onchip SRAM+ WB Cross Bar</td>
    <td  align="center"> <a href="https://github.com/dineshannayya/riscduino_dcore">Link</a></td>
    <td  align="center"> <a href="https://platform.efabless.com/projects/718">Link</a></td>
  </tr>
  <tr>
    <td  align="center"> MPW-5 </td> 
    <td  align="center"> 21-Mar-2022  </td>
    <td  align="center"> Riscduino-QCORE</td>
    <td  align="center"> Quad 32bit RISCV core with cache + Onchip SRAM+ WB Cross Bar</td>
    <td  align="center"> <a href="https://github.com/dineshannayya/riscduino_qcore">Link</a></td>
    <td  align="center"> <a href="https://platform.efabless.com/projects/782">Link</a></td>
  </tr>
</table>

# SOC Pin Mapping
Carvel SOC provides 38 GPIO pins for user functionality. Riscduino SOC GPIO Pin Mapping as follows vs ATMEGA328 and Arudino
<table>
  <tr>
    <td  align="center"><img src="./docs/source/_static/RiscDunio-PinMapping.png" ></td>
  </tr>

</table>

<table>
  <tr align="center"> <td> ATMGA328 Pin No</td> <td> Functionality           </td> <td> Arudino Pin Name</td> <td> Carvel Pin Mapping                   </td></tr>
  <tr align="center"> <td> Pin-1           </td> <td> PC6/RESET              </td> <td>                 </td> <td> digital_io[0]                        </td></tr>
  <tr align="center"> <td> Pin-2           </td> <td> PD0/RXD[0]             </td> <td>  D0             </td> <td> digital_io[1]                        </td></tr>
  <tr align="center"> <td> Pin-3           </td> <td> PD1/TXD[0]             </td> <td>  D1             </td> <td> digital_io[2]                        </td></tr>
  <tr align="center"> <td> Pin-4           </td> <td> PD2/RXD[1]/INT0        </td> <td>  D2             </td> <td> digital_io[3]                        </td></tr>
  <tr align="center"> <td> Pin-5           </td> <td> PD3/INT1/OC2B(PWM0)    </td> <td>  D3             </td> <td> digital_io[4]                        </td></tr>
  <tr align="center"> <td> Pin-6           </td> <td> PD4/TXD[1]             </td> <td>  D4             </td> <td> digital_io[5]                        </td></tr>
  <tr align="center"> <td> Pin-7           </td> <td> VCC                    </td> <td>                 </td> <td>  -                                   </td></tr>
  <tr align="center"> <td> Pin-8           </td> <td> GND                    </td> <td>                 </td> <td>  -                                   </td></tr>
  <tr align="center"> <td> Pin-9           </td> <td> PB6/XTAL1/TOSC1        </td> <td>                 </td> <td> digital_io[6]                        </td></tr>
  <tr align="center"> <td> Pin-10          </td> <td> PB7/XTAL2/TOSC2        </td> <td>                 </td> <td> digital_io[7]                        </td></tr>
  <tr align="center"> <td> Pin-11          </td> <td> PD5/SS[3]/OC0B(PWM1)/T1      </td> <td> D5              </td> <td> digital_io[8]                        </td></tr>
  <tr align="center"> <td> Pin-12          </td> <td> PD6/SS[2]/OC0A(PWM2)/AIN0    </td> <td> D6              </td> <td> digital_io[9] /analog_io[2]          </td></tr>
  <tr align="center"> <td> Pin-13          </td> <td> PD7/A1N1               </td> <td> D7              </td> <td> digital_io[10]/analog_io[3]          </td></tr>
  <tr align="center"> <td> Pin-14          </td> <td> PB0/CLKO/ICP1          </td> <td> D8              </td> <td> digital_io[11]                       </td></tr>
  <tr align="center"> <td> Pin-15          </td> <td> PB1/SS[1]OC1A(PWM3)         </td> <td> D9              </td> <td> digital_io[12]                       </td></tr>
  <tr align="center"> <td> Pin-16          </td> <td> PB2/SS[0]/OC1B(PWM4)      </td> <td> D10             </td> <td> digital_io[13]                       </td></tr>
  <tr align="center"> <td> Pin-17          </td> <td> PB3/MOSI/OC2A(PWM5)    </td> <td> D11             </td> <td> digital_io[14]                       </td></tr>
  <tr align="center"> <td> Pin-18          </td> <td> PB4/MISO               </td> <td> D12             </td> <td> digital_io[15]                       </td></tr>
  <tr align="center"> <td> Pin-19          </td> <td> PB5/SCK                </td> <td> D13             </td> <td> digital_io[16]                       </td></tr>
  <tr align="center"> <td> Pin-20          </td> <td> AVCC                   </td> <td>                 </td> <td> -                                    </td></tr>
  <tr align="center"> <td> Pin-21          </td> <td> AREF                   </td> <td>                 </td> <td> analog_io[10]                        </td></tr>
  <tr align="center"> <td> Pin-22          </td> <td> GND                    </td> <td>                 </td> <td> -                                    </td></tr>
  <tr align="center"> <td> Pin-23          </td> <td> PC0/ADC0               </td> <td>  A0             </td> <td> digital_io[18]/analog_io[11]         </td></tr>
  <tr align="center"> <td> Pin-24          </td> <td> PC1/ADC1               </td> <td>  A1             </td> <td> digital_io[19]/analog_io[12]         </td></tr>
  <tr align="center"> <td> Pin-25          </td> <td> PC2/ADC2               </td> <td>  A2             </td> <td> digital_io[20]/analog_io[13]         </td></tr>
  <tr align="center"> <td> Pin-26          </td> <td> PC3/ADC3               </td> <td>  A3             </td> <td> digital_io[21]/analog_io[14]         </td></tr>
  <tr align="center"> <td> Pin-27          </td> <td> PC4/ADC4/SDA           </td> <td>  A4             </td> <td> digital_io[22]/analog_io[15]         </td></tr>
  <tr align="center"> <td> Pin-28          </td> <td> PC5/ADC5/SCL           </td> <td>  A5             </td> <td> digital_io[23]/analog_io[16]         </td></tr>
  <tr align="center"> <td colspan="4">   Additional Pad used for Externam ROM/RAM/USB </td></tr>
  <tr align="center"> <td> Sflash          </td> <td> sflash_sck             </td> <td>                 </td> <td> digital_io[24]                       </td></tr>
  <tr align="center"> <td> SFlash          </td> <td> sflash_ss0             </td> <td>                 </td> <td> digital_io[25]                       </td></tr>
  <tr align="center"> <td> SFlash          </td> <td> sflash_ss1             </td> <td>                 </td> <td> digital_io[26]                       </td></tr>
  <tr align="center"> <td> SFlash          </td> <td> sflash_ss2             </td> <td>                 </td> <td> digital_io[27]                       </td></tr>
  <tr align="center"> <td> SFlash          </td> <td> sflash_ss3             </td> <td>                 </td> <td> digital_io[28]                       </td></tr>
  <tr align="center"> <td> SFlash          </td> <td> sflash_io0             </td> <td>                 </td> <td> digital_io[29]                       </td></tr>
  <tr align="center"> <td> SFlash          </td> <td> sflash_io1             </td> <td>                 </td> <td> digital_io[30]                       </td></tr>
  <tr align="center"> <td> SFlash          </td> <td> sflash_io2             </td> <td>                 </td> <td> digital_io[31]                       </td></tr>
  <tr align="center"> <td> SFlash          </td> <td> sflash_io3             </td> <td>                 </td> <td> digital_io[32]                       </td></tr>
  <tr align="center"> <td> SSRAM           </td> <td> Reserved               </td> <td>                 </td> <td> digital_io[33]                       </td></tr>
  <tr align="center"> <td> SSRAM           </td> <td> uartm rxd              </td> <td>                 </td> <td> digital_io[34]                       </td></tr>
  <tr align="center"> <td> SSRAM           </td> <td> uartm txd              </td> <td>                 </td> <td> digital_io[35]                       </td></tr>
  <tr align="center"> <td> usb1.1          </td> <td> usb_dp                 </td> <td>                 </td> <td> digital_io[36]                       </td></tr>
  <tr align="center"> <td> usb1.1          </td> <td> usb_dn                 </td> <td>                 </td> <td> digital_io[37]                       </td></tr>
</table>
# Sub IP features

## RISC V Core

Riscduino SOC Integrated 32 Bits RISC V core. Initial version of Single core RISC-V core is picked from 
Syntacore SCR1 (https://github.com/syntacore/scr1)
### RISC V core customization for Riscduino SOC
Following Design changes are done on the basic version of syntacore RISC core
```
   * Some of the sv syntex are changed to standard verilog format to make compatibile with opensource tool iverilog & yosys
   * local Instruction Memory is increased from 4 to 8 location
   * Instruction Request are changed from Single word to 4 Word Burst
   * Multiplication and Divsion are changed to improve timing
   * Additional pipe line stages added to improve the RISC timing closure near to 50Mhz
   * 2KB instruction cache 
   * 2KB data cache
   * Additional router are added towards instruction cache
   * Additional router are added towards data cache
   * Modified AXI/AHB interface to wishbone interface for instruction and data memory interface
```
### Block Diagram
<table>
  <tr>
    <td  align="center"><img src="./docs/source/_static/riscvcore_blockdiagram.png" ></td>
  </tr>
</table>

### RISC V Core Key feature
```
   * RV32I or RV32E ISA base + optional RVM and RVC standard extensions
   * Machine privilege mode only
   * 2 to 5 stage pipeline
   * 2KB icache
   * 2KB dcache
   * Optional Integrated Programmable Interrupt Controller with 16 IRQ lines
   * Optional RISC-V Debug subsystem with JTAG interface
   * Optional on-chip Tightly-Coupled Memory
```


# 6 Channel SAR ADC
 In Process - Looking for community help ...

<table>
  <tr>
    <td  align="center"><img src="./docs/source/_static/6-Channel-SAR-ADC.png" ></td>
  </tr>

</table>

# SOC Memory Map

<table>
  <tr>
    <td  align="center"> RISC IMEM</td> 
    <td  align="center"> RISC DMEM</td>
    <td  align="center"> EXT MAP</td>
    <td  align="center"> Target IP</td>
  </tr>
  <tr>
    <td  align="center"> 0x0000_0000 to 0x0FFF_FFFF  </td> 
    <td  align="center"> 0x0000_0000 to 0x0FFF_FFFF  </td>
    <td  align="center"> 0x0000_0000 to 0x0FFF_FFFF</td>
    <td  align="center"> QSPI FLASH MEMORY</td>
  </tr>
  <tr>
    <td  align="center"> 0x1000_0000 to 0x1000_00FF</td> 
    <td  align="center"> 0x1000_0000 to 0x1000_00FF</td>
    <td  align="center"> 0x1000_0000 to 0x1000_00FF</td>
    <td  align="center"> QSPI Config Reg</td>
  </tr>
  <tr>
    <td  align="center"> 0x1001_0000 to 0x1001_003F</td> 
    <td  align="center"> 0x1001_0000 to 0x1001_003F</td>
    <td  align="center"> 0x1001_0000 to 0x1001_003F</td>
    <td  align="center"> UART</td>
  </tr>
  <tr>
    <td  align="center"> 0x1001_0040 to 0x1001_007F</td> 
    <td  align="center"> 0x1001_0040 to 0x1001_007F</td>
    <td  align="center"> 0x1001_0040 to 0x1001_007F</td>
    <td  align="center"> I2C</td>
  </tr>
  <tr>
    <td  align="center"> 0x1001_0080 to 0x1001_00BF</td> 
    <td  align="center"> 0x1001_0080 to 0x1001_00BF</td>
    <td  align="center"> 0x1001_0080 to 0x1001_00BF</td>
    <td  align="center"> USB</td>
  </tr>
  <tr>
    <td  align="center"> 0x1001_00C0 to 0x1001_00FF</td> 
    <td  align="center"> 0x1001_00C0 to 0x1001_00FF</td>
    <td  align="center"> 0x1001_00C0 to 0x1001_00FF</td>
    <td  align="center"> SSPI</td>
  </tr>
  <tr>
    <td  align="center"> 0x1002_0080 to 0x1002_00FF</td> 
    <td  align="center"> 0x1002_0080 to 0x1002_00FF</td>
    <td  align="center"> 0x1002_0080 to 0x1002_00FF</td>
    <td  align="center"> PINMUX</td>
  </tr>
  <tr>
    <td  align="center"> 0x1003_0080 to 0x1003_07FF</td> 
    <td  align="center"> 0x1003_0080 to 0x1003_07FF</td>
    <td  align="center"> 0x1003_0080 to 0x1003_07FF</td>
    <td  align="center"> SRAM-0 (2KB)</td>
  </tr>
  <tr>
    <td  align="center"> 0x1003_0800 to 0x1003_0FFF</td> 
    <td  align="center"> 0x1003_0800 to 0x1003_0FFF</td>
    <td  align="center"> 0x1003_0800 to 0x1003_0FFF</td>
    <td  align="center"> SRAM-1 (2KB)</td>
  </tr>
  <tr>
    <td  align="center"> 0x1003_1000 to 0x1003_17FF</td> 
    <td  align="center"> 0x1003_1000 to 0x1003_17FF</td>
    <td  align="center"> 0x1003_1000 to 0x1003_17FF</td>
    <td  align="center"> SRAM-2 (2KB)</td>
  </tr>
  <tr>
    <td  align="center"> 0x1003_1800 to 0x1003_1FFF</td> 
    <td  align="center"> 0x1003_1800 to 0x1003_1FFF</td>
    <td  align="center"> 0x1003_1800 to 0x1003_1FFF</td>
    <td  align="center"> SRAM-3 (2KB)</td>
  </tr>
  <tr>
    <td  align="center"> -</td> 
    <td  align="center"> -</td>
    <td  align="center"> 0x3080_0000 to 0x3080_00FF</td>
    <td  align="center"> WB HOST</td>
  </tr>
</table>

# SOC Size

| Block             | Total Cell | Seq      | Combo   |
| ------            | ---------  | -------- | -----   |
| RISC              | 20982      | 3164     | 17818   |
| PINMUX            | 5693       | 1022     |  4671   |
| SPI               | 7120       | 1281     |  5839   |
| UART_I2C_USB_SPI  | 11196      | 2448     |  8748   |
| WB_HOST           | 2796       | 588      |  2208   |
| WB_INTC           | 1878       | 108      |  1770   |
| SAR_ADC           | 118        |  18      |   100   |
| MBIST             | 3125       | 543      |  2582   |
|                   |            |          |         |
| TOTAL             | 52908      | 9172     | 43736   |


# SOC Register Map
##### Register Map: Wishbone HOST

| Offset | Name       | Description   |
| ------ | ---------  | ------------- |
| 0x00   | GLBL_CTRL  | [RW] Global Wishbone Access Control Register |
| 0x04   | BANK_CTRL  | [RW] Bank Selection, MSB 8 bit Address |
| 0x08   | CLK_SKEW_CTRL1| [RW] Clock Skew Control2 |
| 0x0c   | CLK_SKEW_CTRL2 | [RW] Clock Skew Control2 |

##### Register: GLBL_CTRL

| Bits  | Name          | Description    |
| ----  | ----          | -------------- |
| 31:24 | Resevered     | Unsused |
| 23:20 | RTC_CLK_CTRL  | RTC Clock Div Selection |
| 19:16 | CPU_CLK_CTRL  | CPU Clock Div Selection |
| 15:12 | SDARM_CLK_CTRL| SDRAM Clock Div Selection |
| 10:8  | WB_CLK_CTRL   | Core Wishbone Clock Div Selection |
|   7   | UART_I2C_SEL  | 0 - UART , 1 - I2C Master IO Selection |
|   5   | I2C_RST       | I2C Reset Control |
|   4   | UART_RST      | UART Reset Control |
|   3   | SDRAM_RST     | SDRAM Reset Control |
|   2   | SPI_RST       | SPI Reset Control |
|   1   | CPU_RST       | CPU Reset Control |
|   0   | WB_RST        | Wishbone Core Reset Control |

##### Register: BANK_CTRL

| Bits  | Name          | Description    |
| ----  | ----          | -------------- |
| 31:24 | Resevered     | Unsused |
| 7:0   | BANK_SEL      | Holds the upper 8 bit address core Wishbone Address |

##### Register: CLK_SKEW_CTRL1

| Bits  | Name          | Description    |
| ----  | ----          | -------------- |
| 31:28 | Resevered     | Unsused |
| 27:24 | CLK_SKEW_WB   | WishBone Core Clk Skew Control |
| 23:20 | CLK_SKEW_GLBL | Glbal Register Clk Skew Control |
| 19:16 | CLK_SKEW_SDRAM| SDRAM Clk Skew Control |
| 15:12 | CLK_SKEW_SPI  | SPI Clk Skew Control |
| 11:8  | CLK_SKEW_UART | UART/I2C Clk Skew Control |
| 7:4   | CLK_SKEW_RISC | RISC Clk Skew Control |
| 3:0   | CLK_SKEW_WI   | Wishbone Clk Skew Control |

##### Register Map: SPI MASTER

| Offset | Name       | Description   |
| ------ | ---------  | ------------- |
| 0x00   | GLBL_CTRL  | [RW] Global SPI Access Control Register |
| 0x04   | DMEM_CTRL1 | [RW] Direct SPI Memory Access Control Register1 |
| 0x08   | DMEM_CTRL2 | [RW] Direct SPI Memory Access Control Register2 |
| 0x0c   | IMEM_CTRL1 | [RW] Indirect SPI Memory Access Control Register1 |
| 0x10   | IMEM_CTRL2 | [RW] Indirect SPI Memory Access Control Register2 |
| 0x14   | IMEM_ADDR  | [RW] Indirect SPI Memory Address  |
| 0x18   | IMEM_WDATA | [W]  Indirect SPI Memory Write Data |
| 0x1c   | IMEM_RDATA | [R]  Indirect SPI Memory Read Data |
| 0x20   | SPI_STATUS | [R] SPI Debug Status |

##### Register: GLBL_CTRL

| Bits  | Name        | Description    |
| ----  | ----        | -------------- |
| 31:16 | Resevered   | Unsused |
| 15:8  | SPI_CLK_DIV | SPI Clock Div Rato Selection |
| 7:4   | Reserved    | Unused |
| 3:2   | CS_LATE     | CS DE_ASSERTION CONTROL |
| 1:0   | CS_EARLY    | CS ASSERTION CONTROL |

##### Register: DMEM_CTRL1

| Bits | Name       | Description    |
| ---- | ----       | -------------- |
| 31:9 | Resevered  | Unsused        |
| 8    | FSM_RST    | Direct Mem State Machine Reset |
| 7:6  | SPI_SWITCH | Phase at which SPI Mode need to switch |
| 5:4  | SPI_MODE   | SPI Mode, 0 - Single, 1 - Dual, 2 - Quad, 3 - QDDR |
| 3:0  | CS_SELECT  | CHIP SELECT |

##### Register: DMEM_CTRL2

| Bits | Name       | Description    |
| ---- | ----       | -------------- |
| 31:24 | DATA_CNT  | Total Data Byte Count        |
| 23:22 | DUMMY_CNT | Total Dummy Byte Count |
| 21:20 | ADDR_CNT  | Total Address Byte Count |
| 19:16 | SPI_SEQ   | SPI Access Sequence |
| 15:8  | MODE_REG  | Mode Register Value |
| 7:0   | CMD_REG   | Command Register Value |

##### Register: IMEM_CTRL1

| Bits | Name       | Description    |
| ---- | ----       | -------------- |
| 31:9 | Resevered  | Unsused        |
| 8    | FSM_RST    | InDirect Mem State Machine Reset |
| 7:6  | SPI_SWITCH | Phase at which SPI Mode need to switch |
| 5:4  | SPI_MODE   | SPI Mode, 0 - Single, 1 - Dual, 2 - Quad, 3 - QDDR |
| 3:0  | CS_SELECT  | CHIP SELECT |

##### Register: IMEM_CTRL2

| Bits | Name       | Description    |
| ---- | ----       | -------------- |
| 31:24 | DATA_CNT  | Total Data Byte Count        |
| 23:22 | DUMMY_CNT | Total Dummy Byte Count |
| 21:20 | ADDR_CNT  | Total Address Byte Count |
| 19:16 | SPI_SEQ   | SPI Access Sequence |
| 15:8  | MODE_REG  | Mode Register Value |
| 7:0   | CMD_REG   | Command Register Value |

##### Register: IMEM_ADDR

| Bits | Name       | Description    |
| ---- | ----       | -------------- |
| 31:0 | ADDR       | Indirect Memory Address  |

##### Register: IMEM_WDATA

| Bits | Name       | Description    |
| ---- | ----       | -------------- |
| 31:0 | WDATA      | Indirect Memory Write Data  |

##### Register: IMEM_RDATA

| Bits | Name       | Description    |
| ---- | ----       | -------------- |
| 31:0 | RDATA      | Indirect Memory Read Data  |

##### Register: SPI_STATUS

| Bits | Name       | Description    |
| ---- | ----       | -------------- |
| 31:0 | DEBUG      | SPI Debug Status  |


##### Register Map: Global Register

| Offset | Name        | Description   |
| ------ | ---------   | ------------- |
| 0x00   | SOFT_REG0   | [RW] Software Register0 |
| 0x04   | RISC_FUSE   | [RW] Risc Fuse Value  |
| 0x08   | SOFT_REG2   | [RW] Software Register2 |
| 0x0c   | INTR_CTRL   | [RW] Interrupt Control |
| 0x10   | SDRAM_CTRL1 | [RW] Indirect SPI Memory Access Control Register2 |
| 0x14   | SDRAM_CTRL2 | [RW] Indirect SPI Memory Address  |
| 0x18   | SOFT_REG6   | [RW] Software Register6 |
| 0x1C   | SOFT_REG7   | [RW] Software Register7 |
| 0x20   | SOFT_REG8   | [RW] Software Register8 |
| 0x24   | SOFT_REG9   | [RW] Software Register9 |
| 0x28   | SOFT_REG10  | [RW] Software Register10 |
| 0x2C   | SOFT_REG11  | [RW] Software Register11 |
| 0x30   | SOFT_REG12  | [RW] Software Register12 |
| 0x34   | SOFT_REG13  | [RW] Software Register13 |
| 0x38   | SOFT_REG14  | [RW] Software Register14 |
| 0x3C   | SOFT_REG15  | [RW] Software Register15 |

##### Register: RISC_FUSE

| Bits  | Name        | Description    |
| ----  | ----        | -------------- |
| 31:0  | RISC_FUSE   | RISC Core Fuse Value |

##### Register: INTR_CTRL

| Bits  | Name        | Description    |
| ----  | ----        | -------------- |
| 31:20 | Reserved    | Unused         |
| 19:17 | USER_IRQ    | User Interrupt generation toward riscv         |
| 16    | SOFT_IRQ    | Software Interrupt generation toward riscv     |
| 15:0  | EXT_IRQ     | External Interrupt generation toward riscv     |


# Repository contents

```
|verilog
|   ├─  rtl
|   |     |-  syntacore
|   |     |     |─  scr1
|   |     |     |    ├─ **docs**                           | **SCR1 documentation**
|   |     |     |    |      ├─ scr1_eas.pdf                | SCR1 External Architecture Specification
|   |     |     |    |      └─ scr1_um.pdf                 | SCR1 User Manual
|   |     |     |    |─  **src**                           | **SCR1 RTL source and testbench files**
|   |     |     |    |   ├─ includes                       | Header files
|   |     |     |    |   ├─ core                           | Core top source files
|   |     |     |    |   ├─ top                            | Cluster source files
|   |     |     |    |─  **synth**                         | **SCR1 RTL Synthesis files **
|   |     |- Qspi_master
|   |     |     |- src                                     | Qard SPI Master Source files
|   |     |-wb_interconnect
|   |     |     |- src                                     | 3x4 Wishbone Interconnect
|   |     |- digital_core
|   |     |     |- src                                     | Digital core Source files
|   |     |- lib                                           | common library source files
|   |- dv
|   |   |- la_test1                                        | carevel LA test
|   |   |- risc_boot                                       | user core risc boot test
|   |   |- wb_port                                         | user wishbone test
|   |   |- user_risc_boot                                  | user standalone test without carevel soc
|   |- gl                                                  | ** GLS Source files **
|
|- openlane
    |- spi_master                                          | spi_master openlane scripts   
    |- syntacore                                           | Risc Core openlane scripts   
    |- user_project_wrapper                                | carvel user project wrapper 

```


# Prerequisites
   - Docker (ensure docker daemon is running) -- tested with version 19.03.12, but any recent version should suffice.
## Step-1: Docker in ubuntu 20.04 version
```bash
   sudo apt update
   sudo apt-get install apt-transport-https curl rtificates -agent software-properties-common
   curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
   sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable"
   sudo apt update
   apt-cache policy docker-ce
   sudo apt install docker-ce

   #Add User Name to docker
   sudo usermod -aG docker <your user name>
   # Reboot the system to enable the docker setup
```
##  Step-2: Clone , update the Submodule, unzip the content
```bash
   git clone https://github.com/dineshannayya/riscduino.git
   cd riscduino
   git submodule init
   git submodule update
   make unzip
```

## Note-1: RTL to GDS Docker
    - Required openlane and pdk are moved inside the riscduino docker to avoid the external dependency. 
    - flow automatically pull the required docker based on MPW version.
    - RTL to gds docker is hardcoded inside File: openlane/Makefile
```bash
     OPENLANE_TAG = mpw6
     OPENLANE_IMAGE_NAME = riscduino/openlane:$(OPENLANE_TAG)
```
## Note-1.1: View the RTL to GDS Docker content
    - for MPW-6 caravel pdk and openlane avaible inside riscduino/openlane:mpw6 docker 
    - caravel, openlane and pdk envionment are automatically pointed to internal docker pointer
    - To view the docker contents
```bash
    docker run -ti --rm riscduino/openlane:mpw6  bash
    cd /opt/pdk_mpw6     -  pdk folder
    cd /opt/caravel      -  caravel folder 
    cd /openlane         -  openlane folder
    env   - Show the internally defined env's
        CARAVEL_ROOT=/opt/caravel
        PDK_ROOT=/opt/pdk_mpw6
```

## Note-2: RTL Simulation Docker
    - Required caravel and pdk are moved inside the riscduino docker to avoid the external dependency. 
    - flow automatically pull the required docker based on MPW version.
    - To view the docker contents
    - RTL simulation docker hardcoded inside File: Makefile
        simenv:
	    docker pull riscduino/dv_setup:mpw6

## Note-2.1: View the RTL Simulation Docker content
    - for MPW-6 caravel and pdk avaible inside riscduino/dv_setup:mpw6 docker this is used for RTL to gds flows
    - caravel and pdk envionment are automatically pointed to internal docker pointer
    - To view the docker contents
```bash
    docker run -ti --rm riscduino/dv_setup:mpw6  bash
    cd /opt/pdk_mpw6     -  pdk folder
    cd /opt/caravel      -  caravel folder 
    env   - Show the internally defined env's
        CARAVEL_ROOT=/opt/caravel
        PDK_ROOT=/opt/pdk_mpw6
```

# Tests preparation

The simulation package includes the following tests:

* **risc_boot**           - Complete caravel User Risc core boot 
* **wb_port**             - Complete caravel User Wishbone validation
* **uart_master**         - complete caravel user uart master test
* **user_risc_boot**      - Standalone User Risc core boot
* **user_sspi**           - Standalone SSPI test
* **user_qspi**           - Standalone Quad SPI test
* **user_spi**            - Standalone SPI test
* **user_i2c**            - Standalone I2C test
* **user_usb**            - Standalone USB Host test
* **user_risc_boot**      - Standalone Risc Boot test
* **user_uart**           - Standalone Risc with UART-0 Test
* **user_uart1**          - Standalone Risc with UART-1 Test
* **user_gpio**           - Standalone GPIO Test
* **user_pwm**            - Standalone pwm Test
* **user_timer**          - Standalone timer Test
* **user_uart_master**    - Standalone uart master test
* **riscv_regress**       - Standalone riscv compliance and regression test suite


# Running Simulation

Examples:
``` sh
    make verify-wb_port  
    make verify-risc_boot
    make verify-uart_master
    make verify-user_basic
    make verify-user_uart
    make verify-user_uart1
    make verify-user_spi
    make verify-user_i2cm
    make verify-user_risc_boot
    make verify-user_pwm
    make verify-user_timer
    make verify-user_sspi
    make verify-user_qspi
    make verify-user_usb
    make verify-user_uart_master
    make verify-wb_port SIM=RTL DUMP=OFF
    make verify-wb_port SIM=RTL DUMP=ON
    make verify-riscv_regress
```
# Running RTL to GDS flows
   - First run the individual macro file
   - Last run the user_project_wrapper
``` sh
   cd openlane
   make pinmux
   make qspim_top
   make uart_i2cm_usb_spi_top
   make wb_host
   make wb_interconnect
   make ycr_intf
   make ycr_core_top
   make ycr_iconnect
   make user_project_wrapper
```

# Tool Sets

Riscduino Soc flow uses Openlane tool sets.

1. **Synthesis**
    1. `yosys` - Performs RTL synthesis
    2. `abc` - Performs technology mapping
    3. `OpenSTA` - Pefroms static timing analysis on the resulting netlist to generate timing reports
2. **Floorplan and PDN**
    1. `init_fp` - Defines the core area for the macro as well as the rows (used for placement) and the tracks (used for routing)
    2. `ioplacer` - Places the macro input and output ports
    3. `pdn` - Generates the power distribution network
    4. `tapcell` - Inserts welltap and decap cells in the floorplan
3. **Placement**
    1. `RePLace` - Performs global placement
    2. `Resizer` - Performs optional optimizations on the design
    3. `OpenPhySyn` - Performs timing optimizations on the design
    4. `OpenDP` - Perfroms detailed placement to legalize the globally placed components
4. **CTS**
    1. `TritonCTS` - Synthesizes the clock distribution network (the clock tree)
5. **Routing**
    1. `FastRoute` - Performs global routing to generate a guide file for the detailed router
    2. `CU-GR` - Another option for performing global routing.
    3. `TritonRoute` - Performs detailed routing
    4. `SPEF-Extractor` - Performs SPEF extraction
6. **GDSII Generation**
    1. `Magic` - Streams out the final GDSII layout file from the routed def
    2. `Klayout` - Streams out the final GDSII layout file from the routed def as a back-up
7. **Checks**
    1. `Magic` - Performs DRC Checks & Antenna Checks
    2. `Klayout` - Performs DRC Checks
    3. `Netgen` - Performs LVS Checks
    4. `CVC` - Performs Circuit Validity Checks

# Riscduino documentation
    Riscduino documentation available at <https://riscduino.readthedocs.io/en/latest/>

# Arduino ide integration
    We are in initial phase of Riscduino board integration into arduino and integration details are available at <https://github.com/dineshannayya/riscduino_board/>

# News
* **Riscduino Aim** - https://www.youtube.com/watch?v=lFVnicPhTI0

# How To Contribute

We are looking for community help in following activity, interested user can ping me in efabless slack platform

*  **Analog Design**           - ADC, DAC, PLL,
*  **Digital Design**          - New IP Integration, Encription,DSP, Floating point functions
*  **Verification**            - Improving the Verification flow
*  **Linux Porting**           - Build Root integration
*  **Arudino Software Update** - Tool Customisation for Riscduino, Adding additional plug-in and Riscv compilation support
*  **Riscv Simulator**         - integration to Riscduino
*  **Any other ideas**          


# Contacts

Report an issue: <https://github.com/dineshannayya/riscduino/issues>

# Documentation
* **Syntacore Link** - https://github.com/syntacore/scr1

News on Riscduino
===============
* **Riscduino Aim** - https://www.youtube.com/watch?v=lFVnicPhTI0