tft lcd controller vhdl pricelist

This LCD controller is a VHDL component for use in CPLDs and FPGAs. The controller manages the initialization and data flow to HD44780 compatible 8-bit interface character LCD modules. It was primarily developed pursuant to the Lumex LCD General Information datasheet. This example VHDL component allows simple LCD integration into practically any programmable logic application. Figure 1 depicts the controller implemented to interface between an LCD module and a user’s custom logic.

The LCD controller state machine consists of five states. Upon startup, it immediately enters the Power-up state, where it waits 50ms to ensure the supply voltage has stabilized. It then proceeds to an Initialize state. The controller cycles the LCD through its initialization sequence, setting the LCD’s parameters to default values defined in the hardware. This process completes in approximately 2.2ms, and the controller subsequently assumes a Ready state. It waits in this state until the lcd_enable input is asserted, then advances to the Send state. Here, it communicates the appropriate information to the LCD, as defined by the lcd_bus input. After 50us, it returns to the Ready state until further notice. If a low logic level is applied to the reset_n input at any time for a minimum of one clock cycle, the controller resets to the Power-up state and re-initializes. Figure 2 illustrates the LCD controller state machine.

The LCD controller executes an initialization sequence each time it is powered-up or the reset_n pin is deasserted for a minimum of one clock cycle. The controller asserts the busy pin during initialization. Once initialization completes, the busy pin deasserts, and the LCD controller waits in the Ready state for input from the user logic.

The parameters values are specified by setting the GENENIC parameters in the ENTITY. Table 2 describes the parameters. The user can also send commands to the LCD to change any parameters after initialization.

Upon deassertion of the busy pin, the LCD controller enters the Ready state. The user logic can interface via the lcd_enable and lcd_bus pins to conduct transactions with the LCD module. The user initiates this process by issuing the desired data/instruction to the lcd_bus and asserting the lcd_enable pin. The LCD controller then asserts the busy pin and manages the transaction. When finished, the controller deasserts the busy pin, indicating that it is ready for another instruction. Figure 3 depicts the timing diagram for the beginning of a transaction.

The LCD control logic provided manages the initialization and data flow between custom user logic and the 8-bit interface mode of HD44780 compatible character LCD modules. The user can set the system clock frequency and change the default initialization parameters by setting GENERIC parameters in the ENTITY.

>> > RTFM is the universal answer for all of this. There may be some tutorials, but they likely won"t cover the particular LCD you are using - that said, try Googling. The "M""s in "RTFM" are the datasheets for the LCD and the FPGA.

>> > - First start electrically - what does the data sheet for the LCD say is the electrical format of the signals it accepts? (3.3V TTL? LVDS? 1.8V logic? etc.). Then see the FPGA data sheet to see if you can find an IO standard that matches. Hook the two up accordingly.

>> > - Next, write some basic VHDL/verilog/UCF files for the FPGA to instantiate the signals to the LCD in your FPGA and set everything to the appropriate IO standard.

>> > - Then dig into the LCD datasheet again and figure out what commands or data formating it needs and get cracking on a VHDL/verilog state machine or data formatter that accomplishes whatever it is that you want to do with the LCD. Depending on the application it was meant for, most LCDs are either command and buffer based (that is, you write some commands to it, then write to a frame buffer on the LCD controller), or they are video stream based (i.e. no commands necessary, just send raw RGB data continuously).

Digital Blocks TFT LCD Controller reference design enables you to accelerate the design-in of TFT LCD panel displays in your system. The reference design centers on the Digital Blocks DB9000AVLN TFT LCD Controller intellectual property (IP) core, which is available in netlist or VHDL/Verilog HDL register transfer level (RTL) formats.

The DB9000AVLN core contains an Avalon® Memory-Mapped system interconnect for interfacing to the Nios® II embedded processor and SDRAM or SRAM controllers (either memory can serve as the frame buffer). Software supplied with this reference design runs on the Nios II embedded processor to place an image in the frame buffer memory and invokes the DB9000AVLN core to drive the LCD panel.

Using the Intel® Quartus® Design Software, you can instantiate the TFT LCD Controller reference design in a Cyclone®, Cyclone® II, or Cyclone® III FPGA development kit. See the Demonstrated Intel® Technology section for a complete list of supported Intel® FPGA development kits.

You can connect your LCD panel to the Intel FPGA development kit with the fabrication of an appropriate cable. Please contact Digital Blocks for more details.