VGA Controller FPGA Project Overview

Thought

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:

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.
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.
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.
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.
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.

Files

Schematic

Layout

Preview

Manufacturer Part Number

AMS1117-3.3

Capacitance

0.1uF

C21

Capacitance

0.1uF

Capacitance

1uF

C15

Capacitance

0.1uF

C19

Capacitance

0.1uF

Capacitance

10uF

Capacitance

1uF

C10

Capacitance

0.1uF

C17

Capacitance

0.1uF

C22

Capacitance

10uF

Capacitance

0.1uF

Capacitance

1uF

C25

Capacitance

0.1uF

C12

Capacitance

0.1uF

C24

Capacitance

0.1uF

C14

Capacitance

1uF

C13

Capacitance

10uF

Capacitance

10uF

Capacitance

10uF

Capacitance

0.1uF

C16

Capacitance

0.1uF

C20

Capacitance

0.1uF

C23

Capacitance

1uF

C18

Capacitance

0.1uF

C11

Capacitance

0.1uF

Resistance

549 Ω

Resistance

1kΩ

Resistance

1kΩ

Resistance

2kΩ

R12

Resistance

330 Ω

Resistance

1kΩ

R14

Resistance

10kΩ

R10

Resistance

2kΩ

R11

Resistance

330 Ω

Resistance

1kΩ

R15

Resistance

10kΩ

Resistance

549 Ω

Resistance

2kΩ

R13

Resistance

10kΩ

Resistance

549 Ω

VGA1

LED1

Manufacturer Part Number

NCP1117ST50T3G

IC1

FPGA VGA Controller Template