About the Development Board 1.1 Overview The RUNBER development board is a brand new set of FPGA development suite developed by MYMINIEYE, which adopts the GOWIN GW1N-UV4LQ144 solution. GW1N-4B is a FPGA product of the GOWIN LittleBee family. The development system provides open source of the schematic diagram and a large amount of source codes that can be directly used in the project. For matching source codes, please see the course list.

Figure 1.1 RUNBER Development Board 1.2 About the Development System 1.2.1 System Resources The RUNBER development board is a development suite based on the Gowin GW1N-4 extensible processing platform. It provides the following features: ◎ Gowin® GW1N-UV4LQ144C6/I5  Default startup mode: built-in flash

◎ Peripherals/ports  Micro USB port (onboard USB JTAG port)  Common cathode 8-segment, 4-digit numeric display  8-digit DIP switch  8-digit LED  8-digit key  4 RGB LEDs (common anode)  36 expanded IO ports (2.54mm pin headers) ◎ Onboard crystal oscillator  12MHz 2 About the Port 2.1 USB to JTAG port A USB-to-JTAG module is integrated on the Runber board. With the FT232HQ of FTDI as a connector, a USB-to-micro cable can connect the onboard JTAG module via the onboard J14 (micro USB socket, the corresponding port of which can be found by referring to the above drawing of the board ports). The computer can recognize the following drivers when it gets connected:

FPGA model of the RUNBER: GW1N-UV4LQ144C6/I5; If the warning below appears after the fs file is compiled, the devices do not match each other;

If the models of the devices selected in the project correspond with our boards, there must be problems in selection of the series of the devices. Double click the devices in the box in the figure below for resetting. The models of the devices can also be changed here if they do not correspond with the board.

If the series of the devices are unknown, you can get the models of the devices via JTAG scan as indicated below (the series of the devices are in Device Chooser, the number ending with R is that for the FPGA with built-in SDRAM, and the devices selected by the Runber board do not have the built-in SDRAM):

2.2 Power supply The board can be powered with the VBUS from the USB, or the 5V power from the expansion port or 3.3V power from a LDO. As we select the UV series devices, up to 3.3V core voltage is supported, which simplifies the power system of the board.

2.3 Clock The Runber board features an oscillator that provides clock for FT232HQ and GW1N-4 at the same time at a frequency of 12MHz. The pins connecting GW1N-4 are shown in the table below: Signal Description Gowin pins FPGA_CLK_12M Clock input at 12MHz 4 2.4 Common cathode numeric display The correspondence between the pins of the numeric display and the segment selection is shown in the figure below, with the response time of about 0.1us. An average forward current of 20mA is needed for each segment.

The pins connecting GW1N-4 are shown in the table below: Signal Description Gowin pins SEG_DIG1 Digit 1of the numeric display from the left 137 SEG_DIG2 Digit 2 of the numeric display from the left 140 SEG_DIG3 Digit 3 of the numeric display from the left 141 SEG_DIG4 Digit 4 of the numeric display from the left 7 SEG_A Segment A of the numeric display 138 SEG_B Segment B of the numeric display 142 SEG_C Segment C of the numeric display 9 SEG_D Segment D of the numeric display 11 SEG_E Segment E of the numeric display 12 SEG_F Segment F of the numeric display 139 SEG_G Segment G of the numeric display 8 SEG_DP Segment DP of the numeric display 10 2.5 Monochrome LEDs The Runber board features 8 LEDs for IO control, as well as a power indicator at the side of the micro USB socket (POWER) and a loading indicator below the crystal oscillator (U27) (DONE). The 8 controllable LEDs can be lightened at high level. The circuit diagram and the connection of the pins are shown below:

Signal Description Gowin pin LED1 Control signal of LED1 23 LED2 Control signal of LED2 24 LED3 Control signal of LED3 25 LED4 Control signal of LED4 26 LED5 Control signal of LED5 27 LED6 Control signal of LED6 28 LED7 Control signal of LED7 29 LED8 Control signal of LED8 30 2.6 RGB LEDs The Runber board features 4 common anode RGB LEDs; the corresponding color of the LED will light up when the control IO is at low level.

Signal Description Gowin pins G_LED1 Control signal of G_LED1 114 B_LED1 Control signal of B_LED1 113 R_LED2 Control signal of R_LED2 112 G_LED2 Control signal of G_LED2 111 B_LED2 Control signal of B_LED2 110 R_LED2 Control signal of R_LED2 106 G_LED3 Control signal of G_LED3 104 B_LED3 Control signal of B_LED3 102 R_LED3 Control signal of R_LED4 101 G_LED4 Control signal of G_LED4 100 B_LED4 Control signal of B_LED4 99 R_LED4 Control signal of R_LED4 98 2.7 DIP switch The Runber board features an 8-digit DIP switch. The circuit design is that the IO can recognize low level by default, and we get high level when the switch gets through. The circuit is shown below:

The connection of the pins is shown in the table below: Signal Description Gowin pins SW1 Control signal of SW1 75 SW2 Control signal of SW2 76 SW3 Control signal of SW3 78 SW4 Control signal of SW4 79 SW5 Control signal of SW5 80 SW6 Control signal of SW6 81 SW7 Control signal of SW7 82 SW8 Control signal of SW8 83 2.8 Keys The Runber board features 8 soft touch keys. The circuit design is that the IO can recognize high level by default, and we get low level when the key is pressed down. The circuit is shown below:

The connection of the pins is shown in the table below: Signal Description Gowin pin KEY1 Control signal of KEY1 58 KEY2 Control signal of KEY2 59 KEY3 Control signal of KEY3 60 KEY4 Control signal of KEY4 61 KEY5 Control signal of KEY5 62 KEY6 Control signal of KEY6 63 KEY7 Control signal of KEY7 64 KEY8 Control signal of KEY8 65 2.9 Expansion IO The Runber board reserves 2 set of 2.54mm pin headers (20 pins) for expansion by the user. The connection of the circuit is shown below:

J1 is to the left of the numeric display. The MSPI_CLK, MSPI_CS, MSPI_MOSI and MSPI_MISO connected to J1 are special pins use to connect externally mounted FLAH, which can be set as regular IO. The process of setting up in the project is shown below: (1) Open the project configuration;

(2) Select Dual-Purpose Pin under Place&Route, and then tick Use MSPI as regular IO.

The connection of the pins of J1 is shown below: Signal Description Gowin pin A3V3_1A Pin for 3.3V power (the first from the end of the numeric display)
GPIO38 Expansion IO 38 GPIO39 Expansion IO 39 GPIO40 Expansion IO 40 GPIO41 Expansion IO 41 GPIO42 Expansion IO 42 GPIO43 Expansion IO 43 GPIO44 Expansion IO 44 GPIO66 Expansion IO 66 GPIO67 Expansion IO 67 GPIO68 Expansion IO 68 GPIO69 Expansion IO 69 GPIO70 Expansion IO 70 GPIO71 Expansion IO 71 GPIO72 Expansion IO 72 MSPI_CLK SPI clock pin when used as MSPI connector 96 MSPI_CS SPI enable pin when used as MSPI connector 95 MSPI_MOSI SPI output pin when used as MSPI connector 94 MSPI_MISO SPI input pin when used as MSPI connector 93 GND Ground pin
J2 is to the right of the numeric display (the side of LED), with the 1st pin at the end of the numeric display and the 20th at the end of the key. The pins connected to gowin are numbered in the same way as the signal; the input for VBUS signal is 5V. The connection of the pins of J2 is shown below: Signal Description Gowin pin VBUS Pin for 5V power (the first from the end of the numeric display)
GPIO136 Expansion IO 136 GPIO135 Expansion IO 135 GPIO134 Expansion IO 134 GPIO133 Expansion IO 133 GPIO132 Expansion IO 132 GPIO131 Expansion IO 131 GPIO130 Expansion IO 130 GPIO129 Expansion IO 129 GPIO128 Expansion IO 128 GPIO123 Expansion IO 123 GPIO122 Expansion IO 122 GPIO121 Expansion IO 121 GPIO120 Expansion IO 120 GPIO119 Expansion IO 119 GPIO118 Expansion IO 118 GPIO117 Expansion IO 117 GPIO116 Expansion IO 116 GPIO115 Expansion IO 115 GND Ground pin
2.10 Connection to external power supply for Runber When used as a module, the Runber can be powered in 2 ways: (1) 5V power for Runber via Pin1 of J2; (2) 3.3V power for Runber via Pin1 of J1. Note: Runber can function when powered in either of the above ways.