School of Engineering DT2 Projekt-2: Baud Rate Generator & GPS Decoder
School of Engineering GPS Uhr Überblick
School of Engineering GPS Uhr Minimum Features Uart-RX Unit GPS Decoder LCD Unit LCD Controller LCD Driver MaxII FPGA from GPS RX module to LCD Display
School of Engineering Sample Punkte des UART
School of Engineering uart_rx_in serial_in UART RX uart_rx_out rx_data(7:0) rx_data_valid Signal überabtasten Edge erkennen (Start Bits) Tick für Abtastung generieren Data Bits abtasten Buffer 1 Byte Byte am Decoder weitergeben
School of Engineering Abtasten des seriellen Datenstroms P edge TT + ½ T baud_tick Bit-Pointer
School of Engineering serial_in UART RX rx_data(7:0) rx_data_valid Edge Detector clock reset Tick Generator Data Abtaster
School of Engineering Baud Rate Generator Tick Generator Baud Rate Generator 50MHz Edge ResetBaud_tick
School of Engineering Taktteiler-Baud Rate Generator Load Value Load Value -1 Load Value MHz Edge Baud Counter Baud_tick Reload Value 0 1/4800s 1.5/4800 s
School of Engineering uart_rx_out rx_data(7:0) rx_data_valid GPS Decoder gps_time sec_einer(7:0) sec_zehner(7:0) min_einer(7:0) min_zehner(7:0) std_einer(7:0) std_zehner(7:0) Nach dem GPS Telegramm Header suchen Nur die Bytes mit der Zeitinformation abspeichern Zeitinformation an den Display Controller weitergeben
School of Engineering GPS Telegram Link: NMEA-0183 Protokoll :
School of Engineering ASCII Zeichensatz
School of Engineering idle , G P P $ !V !Valid V V V V V $ V & G V & P V & G V &, V & ! $ V & ! G GPS Decoder Statemachine
School of Engineering GPS Decoder UART_DATA sec_einer sec_zehner min_einer min_zehner std_einer std_zehner CLK VALID Time Register