VGA Controller FPGA Project Overview

flux

This project is a reference/template design for a VGA controller that uses an ICE40-platform FPGA (the ICE40HX1K-VQ100) as its central processing unit. Here’s a brief overview:
  1. FPGA Core:
    • The FPGA (U2) is responsible for generating the VGA timing signals and interfacing with external components.
    • It is housed in a TQFP‑100 package and includes a large number of I/O pins used—in this design—for data, control, and clock functions.
  2. Memory Interface:
    • An external asynchronous SRAM (IS62WV25616BLL-55TLI) is included, likely to store video frame data or provide a frame buffer for the VGA output.
  3. Clock Generation:
    • A 27 MHz oscillator (Y1—ASFL3‑27.000MHZ‑EK‑T) provides the necessary clock signal. This frequency (or a derived clock) is used as the basis for VGA timing generation.
  4. Power and Voltage Regulation:
    • Voltage regulation is managed with linear regulators such as the AMS1117‑3.3 and NCP1117 variants, ensuring the proper supply voltages (3.3 V, +1V2, +5 V, etc.) are delivered to the FPGA and other logic.
    • Multiple power net portals (+3V3, +5V, etc.) are defined to maintain clean, well-distributed power.
  5. Support Components and Connectivity:
    • Numerous net portals (e.g., SRAM_A#, SRAM_D#, FPGA_VGA_*, etc.) are used to logically group and connect different signals across the design.
    • Decoupling capacitors, resistors, and additional passive components are added as needed for signal integrity and proper operation.
    • The design also includes a VGA connector (KH-HDR15P-F3.08) for output, which is used to physically drive the display.
Overall, the project is structured as a template where the FPGA implements the VGA signal generation logic and communicates with external SRAM memory for video data, while a supporting network of passive components and regulators ensures proper power supply and signal conditioning throughout the system. This makes it a comprehensive starting point for developers looking to implement VGA controllers on devices like the ICE40 series FPGAs.
Sign up to send

Files

Schematic

Layout

3D View

U2
C21
Capacitance
0.1uF
+3V3
+3V3
C24
Capacitance
0.1uF
+3V3
+3V3
+3V3
C23
Capacitance
1uF
SRAM_A0
SRAM_D4
SRAM_A1
SRAM_D4
SRAM_LB
MOSI
MISO
SRAM_A4
SRAM_A11
FPGA_VGA_GREEN_2
SRAM_A5
SRAM_A2
SRAM_A3
SRAM_A7
SRAM_D8
SRAM_A8
SRAM_D14
SRAM_A2
SRAM_D10
SRAM_D2
FPGA_VGA_GREEN_0
SRAM_OE
FPGA_VGA_HSYNC
FPGA_VGA_BLUE_1
SRAM_A16
SRAM_A10
SRAM_A17
SRAM_A6
SRAM_A16
SRAM_D2
SRAM_D5
SRAM_A9
SRAM_D11
SRAM_A14
SRAM_WE
SRAM_CS
SRAM_D12
SRAM_OE
SRAM_D6
SRAM_A13
SRAM_D7
SRAM_A10
SRAM_A8
FPGA_VGA_VSYNC
SRAM_D9
SRAM_D14
SRAM_D15
CRESET
SRAM_LB
SRAM_A4
SRAM_D12
SRAM_D6
SRAM_A14
SRAM_A15
SRAM_D1
FPGA_VGA_RED_2
SRAM_D7
SRAM_WE
SRAM_A5
SRAM_A6
SRAM_UB
SRAM_A7
SRAM_D0
CDONE
FPGA_VGA_BLUE_2
SRAM_A9
SRAM_D3
SRAM_A13
SRAM_D13
SRAM_A15
SRAM_UB
SRAM_D1
FPGA_VGA_RED_1
SCK
SRAM_D13
SRAM_D0
SRAM_A12
SRAM_D9
SRAM_A11
SRAM_D10
SRAM_A12
FPGA_VGA_RED_0
SS
FPGA_VGA_BLUE_0
SRAM_A0
SRAM_D15
SRAM_D3
SRAM_D8
SRAM_D11
FPGA_VGA_GREEN_1
SRAM_D5
SRAM_A1
SRAM_A3
SRAM_CS
IC1
D1

FPGA VGA Controller Template