User Manual of Motherboard+for+Solid+Xilinx XC3S1000 Motherboard

Motherboard for Solid Xilinx XC3S1000 MotherboardUser ManualVer1.0SolidDigi Technologies, IncTable of ContentChapter 1 Brief Introduction (3)Configuration of the motherboard (3)Introduction of major components (4)Chapter 2 Button, 7-seg LED, and Buzzer (6)Button (6)7-seg LED (6)Buzzer (7)Chapter 3 VGA Interface (8)Chapter 4 PS/2 Mouse/keyboard interface (10)Chapter 5 RS-232 Serial Port (11)Chapter 6 16X2/16X4 Character LCDs (12)Introduction (11)Pin definition (12)Chapter 7 USB interface and chipset (15)Chapter 8 High-speed asynchronous SRAM (16)Chapter 9 High-speed synchronous SDRAM (17)Chapter 10 High capacity fast Flash (18)Chapter 11 Extended User IO (19)Chapter 12 Reset circuit (20)Notes (15)Chapter 1 Brief IntroductionThis motherboard is designed to help use the Solid core board XC3S1KCORE-Lite Xilinx FPGA developed. The motherboard is equipped with 7-seg LED, button and switch, dual RS232 serial ports, VGA port, PS2 interface, USB port, 16X2 character LCD, buzzer and audio circuit. Configuration of the motherboardIllustration of the motherboardMotherboard fitted with Solid core boardExplanation of Major Components●256K Byte high-speed, asynchronous SRAMOne piece of 256K×16Bit SRAM，independent byte enable signal.●4MB/8MB high speed SDARMOne piece of 4×1 M Bit ×16 SDRAM ，highest read/write speed is 166MHz ●4MB (32M bit) fast FLASHOne piece of 4M×8Bit or 12M×16Bit Flash Read/write speed is 90ns;Flexible page mode of which can be used to store FPGA configuration files or images of operation system.●9 Pin RS-232 serial portsUsed to communicate with host.Debug port.512- color VGA interfaceConnect to VGA monitor directly. It can be used to verify VGA timing.●7-seg LED and 8 LEDsDisplay different kinds of numbers and signals.●16X2/16X4 character LCDs●AUDIO interface●Buzzer interface●PS/2 mouse and keyboard interfacesStandard mouse\ keyboard interface supports device 3.3V/5V. Can be used to verify PS/2 interface agreement and achieve one IO device expansion.●USB2.0 high-speed data interfaceUse the CY68013 from Cypress to achieve the expansion of USB interface which realizes the high speed data transfer with PC.●User customable serial interfacesDirectly expand the FPGA’s IO to USB interface. It is used to assess the FPGA’s ability of achieving of USB PHY or serial standards customized by user.Chapter 2 Button, Switch, 7-SEG LED and BuzzerThey are used to debug and display the results.Button SwitchThe motherboard has 5-bit button switches, labeled from left to right are SW5，SW4，SW3 ，SW2 shown in Figure 2-1. When not pressed, the buttons keep high level. When pressed and released, they generate a falling edge and a rising edge.Figure 2-1 Schematics of the button switches.7-seg LEDThe motherboard has one 4-digits 7-seg LEDs, which can be used to display digits. The schematic is shown in Figure 2-2.Figure 2-2 Schematic of 4-digit 7-seg LEDsBuzzerThe motherboard has one buzzer. It can generate tones of different frequencies. The schematic is shown in Figure 2-3.Figure 2-3 Schematics of buzzer circuit.Chapter 3 VGA InterfaceThe motherboard includes VGA port. The schematic is shown in Figure 3-1.It can be connected to monitors by VAG cable.Figure 3-1 VGA interface definition and circuit schematicControl signal:VD1(Red_L)VD2(Red_M)VD3(Red_H)VD4(Green_L)VD5(Green_M),VD6(Green_H),VD7(Blue_L)VD8(Blue_M)VD9(Blue_H),VGA_HS(Horizontal Sync, horizontal scan HS)VGA_VS(Vertical Sync ,vertical scan VS).Each color has 3-bit control lines (high, mid, low), which serially connected the IOs of FPGA through resisters 100om，300om and 1Kom separately. As there are three color lines (red, green and blue) of VGA port, there are in total 9 color control lines which can show 29=512 colors. VGA_HS and VGA_VS signals are TTL level which control the horizontal scan and vertical scan of VGA monitor separately.Chapter 4 PS/2 mouse/keyboard interface The mouse/keyboard interface on the motherboard uses standard 6-pin mini-DIN interface. Circuit schematic is shown in Figure 4-1. The signal definition of the interface signals are shown in Figure 4-2. Only pin1 and 5 are connected to the user customized pins on FPGA.Figure 4-1 PS/2 circuit schematicFigure 4-2 PS/2 DIN physical interfacePC mouse and keyboard use 2 signal lines to communicate. PS/2 bus includes clock line and data line. Data line uses 11-bit serial signal which includes: start bit, 8 data bits, parity check bit and finish bit.Chapter 5 RS-232 Serial PortsThe Motherboard has two RS-232 serial ports (one is in the form of DB9, and the other is in the form of headers)，which can send and receive data separately at the same time.The pin definition of the DB9 port is shown in Figure 5-1. The schematic is shown in Figure 5-2. You can use serial cable to connect to PC or terminal directly.The other serial port uses standard 2.54mm 3-pin headers.Figure 5-1 DB9 interface diagramFigure 5-2 Circuit schematic of the serial portsDuring the data transmission, the related LEDs will blink.Chapter 6 16X2/16X4 Character LCDs IntroductionThe motherboard includes one 16X2 character LCD, which can display two lines and each line can show 16 characters; one 16X4 character LCD which can show 4 lines and each line can show 16 characters. Circuit schematic is shown in Figure 6-1.Figure 6-1 Circuit schematic of character LCDsPin definition：Take 1602 LCD for example.Pin 1: VSS is ground..Pin 2: VDD is 5V power supply.Pin 3: V0 is the contrast adjustment terminal of LCD screen. When connected to positive power supply, the contrast is the weakest.When connected to the ground power supply, the contract is thestrongest. If the contrast is over strong, it will cause “ghostshadow”. You can use one 10K potentiometer to adjust thecontrast.Pin 4：RS is the resisters selection. It will select data registers under highlevel and command registers under low level.Pin 5：RW is read/write signal line. Read under high level and write under low level. When RS and RW are low level at the same time, youcan write command or show address. When RS is low level andRW is high level, you can read busy signal. When RS is high leveland RW is low level, you can write in data.Pin 6：E port is the enable port. When E port changes from high level to low level, LCD module executes command.Pins 7 to 14：D0 to D7 are 8 bits double directions data lines.Chapter 7 USB interface and chipset The motherboard includes one USB interface which can connect to host (such as PC) directly by USB cable. The motherboard uses Cypress’s chip CY68013 . The Circuit schematic is shown in Figure 7-1.Figure 7-1 Schematics of USB.Chapter 8 High-speed asynchronous SRAM IDT’s high-speed asynchronous SRAM is used on the motherboard，and the capacity is 256K×16Bit. It has independent byte-enable signal that can operate on each byte. The circuit schematic is shown in Figure 8-1.Figure 8-1 Schematic of SRAM schematicChapter 9 High-speed synchronous SDRAM The motherboard uses Hynix’s HY57V641620HG. The schematic is shown in Figure 9-1.Figure 9-1 Schematic of SDRAM circuit.Chapter 10 High capacity fast Flash The motherboard uses Scansion’s Am29LV320D, and the schematic can be shown in Figure 10-1.Figure 10-1 The schematic of FLASH.Chapter 11 Extended user IOThe schematic is shown in Figure 11-1.Figure 11-1 GPIO circuit schematicTo interface some non-standard interface chips, such as ADC/DAC, we can use extended user IOs to achieve.Chapter 12 Reset circuitNotesThe schematic of the reset is shown in Figure 12-1.Figure 12-1 Schematic of reset circuit.21SolidDigi Technologies, IncAddress: Building A of Nano Sensor Park, 200 Linghu Ave, Taihu International ScienceTechnology Park, WuXi New District, WuXi, JiangSu, ChinaTel: +86-510-85387391Fax: +86-510-85387691Email: sales@ SOLID Digital technologies。