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FPGA Resources[edit]

EP4CExx Resources.PNG

  • 56 1Kx9 RAM blocks

FPGA Board[edit]


  • Power LED - D4
  • User LED - D5 - FPGA Pin E4
  • KEY0 - SW1 - FPGA Pin W13
  • KEY1 - SW2 - FPGA Pin Y13
  • nCONFIG - SW3
  • JP5 - 5V


J1 - I/O Connector[edit]


U7 - FPGA to RETRO-EP4CE15 card[edit]


U8 - FPGA to RETRO-EP4CE15 card[edit]



H1 - Power[edit]

  • Power from USB 5V
  • Do not power from FPGA when this jumper is installed

H2 - I/O Power Source[edit]

  • 1-2 = FPGA Power
  • 2-3 = On-board Regulator

J3 - Header[edit]

  • J8P55 = IO_B22
  • J8P56 = IO_B21
  • J8B57 = IO_N20
  • J8P58 = IO_N19
  • J8P59 = IO_M20
  • J8P60 = IO_M19



P2 - PS/2 Keyboard[edit]

  • PS2DAT = PIN_R1
  • PS2CLK = PIN_R2


P3 - USB-C[edit]

  • FT230X FTDI USB to Serial
# Serial Port
set_location_assignment PIN_B22 -to serSelect
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to serSelect
set_location_assignment PIN_B10 -to txd1
set_location_assignment PIN_B13 -to rxd1
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to rxd1
set_location_assignment PIN_A10 -to rts1

P4 - SD Card[edit]


VGA - Ideal Drive 2:2:2 Case[edit]

  • FPGA has a 3.3V driver which can drive 8 mA
  • Ideal case drive current
    • 0.7V into 75 Ohms = 9.33 mA
  • R-2R values
  • Voltage steps are:

VGA Sim 2R Voltage.PNG

  • Current steps are:

VGA Sim 2R Current.PNG


Programming the FPGA EEPROM[edit]

  • File
  • Convert Programming File
  • Configuration Device = EPCQ64
  • Mode = Active Serial
  • Programming File Type: *.jic
  • Advanced = Check both Disables...
  • Select Flash Loader
  • Add Device = Cyclone IV and EP4CE15
  • Select SOF Data
  • Select Add File and select the .sof file
  • Generate
  • In Tools, Programmer
  • Mode: JTAG
  • Add file and select the .jic file
  • Select Program/Configure
  • Takes a while to program
  • Press button near VGA

Multicomp Builds[edit]


Rev 2 Issues[edit]

  • GND on wrong USB pin
    • Was pin 4, s/b pin 5
    • Cut etch J4-4 to via
    • Add wire J4-5 to via
  • FT230XS +3.3V out needs 10 uF cap (min)
    • Added 47uF electrolytic cap between via GND and vusb (3.3V) on rear of board


Rev 1 Issues[edit]

  • Wrong DB15HD footprint
    • Change to right footprint in Rev 2
  • USB-C too hard to hand solder
    • Changing to USB-B Micro in Rev 2
  • Add 5V header in Rev 2

Rev 1 Prototype[edit]

  • VGA connector footprint problem
  • Using the J1 connector to VGAX49 card
Signal VGAX49 Pin RETRO Pin FPGA Pin
GND J1-19 J1-49 N/A
R4 J1-1 J1-47 C21
R3 J1-2 J1-48 C22
G5 J1-6 J1-45 D21
G4 J1-7 J1-46 D22
B4 J1-12 J1-43 E21
B3 J1-13 J1-44 E22
HS J1-17 J1-41 F21
VS J1-18 J1-42 F22
  • Serial
Signal RETRO Pin FPGA Pin
GND J1-50 N/A
SerTx J1-39 H21
SerRx J1-40 H22
SerCts J1-37 J21
SerRts J1-38 J22

Testing with R32V2020 and Multicomp[edit]


Pin List[edit]

set_global_assignment -name FAMILY "Cyclone IV E"
set_global_assignment -name DEVICE EP4CE15F23C8
set_global_assignment -name TOP_LEVEL_ENTITY Microcomputer
set_global_assignment -name ORIGINAL_QUARTUS_VERSION "13.0 SP1"
set_global_assignment -name PROJECT_CREATION_TIME_DATE "17:55:48  OCTOBER 20, 2013"
set_global_assignment -name LAST_QUARTUS_VERSION "18.1.0 Lite Edition"
set_global_assignment -name PROJECT_OUTPUT_DIRECTORY output_files
set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top
set_global_assignment -name PARTITION_COLOR 16764057 -section_id Top
set_global_assignment -name MIN_CORE_JUNCTION_TEMP 0
set_global_assignment -name MAX_CORE_JUNCTION_TEMP 85
set_global_assignment -name DEVICE_FILTER_PACKAGE FBGA
set_global_assignment -name DEVICE_FILTER_SPEED_GRADE 8
set_global_assignment -name STRATIX_DEVICE_IO_STANDARD "3.3-V LVTTL"
# Clock and reset
set_location_assignment PIN_T2 -to i_CLOCK_50
set_location_assignment PIN_W13 -to n_reset
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to n_reset
# PS/2
set_location_assignment PIN_R1 -to ps2Clk
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to ps2Clk
set_location_assignment PIN_R2 -to ps2Data
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to ps2Data
# Serial
set_location_assignment PIN_B22 -to serSelect
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to serSelect
set_location_assignment PIN_A13 -to cts1
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to cts1
set_location_assignment PIN_A10 -to rts1
set_location_assignment PIN_B13 -to rxd1
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to rxd1
set_location_assignment PIN_B10 -to txd1
# Video
set_location_assignment PIN_B15 -to videoR0
set_location_assignment PIN_A15 -to videoR1
set_location_assignment PIN_B16 -to videoG0
set_location_assignment PIN_A16 -to videoG1
set_location_assignment PIN_B17 -to videoB0
set_location_assignment PIN_A17 -to videoB1
set_location_assignment PIN_B18 -to hSync
set_location_assignment PIN_A18 -to vSync
set_location_assignment PIN_F1 -to n_sRamCS
set_location_assignment PIN_B4 -to n_sRamWE
set_location_assignment PIN_J2 -to n_sRamOE
set_location_assignment PIN_E1 -to sramData[0]
set_location_assignment PIN_C1 -to sramData[1]
set_location_assignment PIN_B1 -to sramData[2]
set_location_assignment PIN_B3 -to sramData[3]
set_location_assignment PIN_B2 -to sramData[4]
set_location_assignment PIN_C2 -to sramData[5]
set_location_assignment PIN_D2 -to sramData[6]
set_location_assignment PIN_F2 -to sramData[7]
set_location_assignment PIN_H1 -to sramAddress[0]
set_location_assignment PIN_J1 -to sramAddress[1]
set_location_assignment PIN_M1 -to sramAddress[2]
set_location_assignment PIN_N1 -to sramAddress[3]
set_location_assignment PIN_P1 -to sramAddress[4]
set_location_assignment PIN_P2 -to sramAddress[5]
set_location_assignment PIN_N2 -to sramAddress[6]
set_location_assignment PIN_M2 -to sramAddress[7]
set_location_assignment PIN_H2 -to sramAddress[8]
set_location_assignment PIN_A3 -to sramAddress[9]
set_location_assignment PIN_A4 -to sramAddress[10]
set_location_assignment PIN_C3 -to sramAddress[11]
set_location_assignment PIN_A5 -to sramAddress[12]
set_location_assignment PIN_A6 -to sramAddress[13]
set_location_assignment PIN_A7 -to sramAddress[14]
set_location_assignment PIN_A8 -to sramAddress[15]
set_location_assignment PIN_B7 -to sramAddress[16]
set_location_assignment PIN_B6 -to sramAddress[17]
set_location_assignment PIN_B5 -to sramAddress[18]
set_location_assignment PIN_Y6 -to sdRamClk
set_location_assignment PIN_W6 -to sdRamClkEn
set_location_assignment PIN_AA4 -to n_sdRamCas
set_location_assignment PIN_AA3 -to n_sdRamCe
set_location_assignment PIN_AB3 -to n_sdRamRas
set_location_assignment PIN_AB4 -to n_sdRamWe
set_location_assignment PIN_V2 -to sdRamAddr[0]
set_location_assignment PIN_V1 -to sdRamAddr[1]
set_location_assignment PIN_U2 -to sdRamAddr[2]
set_location_assignment PIN_U1 -to sdRamAddr[3]
set_location_assignment PIN_V3 -to sdRamAddr[4]
set_location_assignment PIN_V4 -to sdRamAddr[5]
set_location_assignment PIN_Y2 -to sdRamAddr[6]
set_location_assignment PIN_AA1 -to sdRamAddr[7]
set_location_assignment PIN_Y3 -to sdRamAddr[8]
set_location_assignment PIN_V5 -to sdRamAddr[9]
set_location_assignment PIN_W1 -to sdRamAddr[10]
set_location_assignment PIN_Y4 -to sdRamAddr[11]
set_location_assignment PIN_V6 -to sdRamAddr[12]
set_location_assignment PIN_Y1 -to sdRamAddr[13]
set_location_assignment PIN_W2 -to sdRamAddr[14]
set_location_assignment PIN_AA10 -to sdRamData[0]
set_location_assignment PIN_AB9 -to sdRamData[1]
set_location_assignment PIN_AA9 -to sdRamData[2]
set_location_assignment PIN_AB8 -to sdRamData[3]
set_location_assignment PIN_AA8 -to sdRamData[4]
set_location_assignment PIN_AB7 -to sdRamData[5]
set_location_assignment PIN_AA7 -to sdRamData[6]
set_location_assignment PIN_AB5 -to sdRamData[7]
set_location_assignment PIN_Y7 -to sdRamData[8]
set_location_assignment PIN_W8 -to sdRamData[9]
set_location_assignment PIN_Y8 -to sdRamData[10]
set_location_assignment PIN_V9 -to sdRamData[11]
set_location_assignment PIN_V10 -to sdRamData[12]
set_location_assignment PIN_Y10 -to sdRamData[13]
set_location_assignment PIN_W10 -to sdRamData[14]
set_location_assignment PIN_V11 -to sdRamData[15]
set_location_assignment PIN_AB14 -to IO_PIN[3]
set_location_assignment PIN_AA14 -to IO_PIN[4]
set_location_assignment PIN_AB15 -to IO_PIN[5]
set_location_assignment PIN_AA15 -to IO_PIN[6]
set_location_assignment PIN_AB16 -to IO_PIN[7]
set_location_assignment PIN_AA16 -to IO_PIN[8]
set_location_assignment PIN_AB17 -to IO_PIN[9]
set_location_assignment PIN_AA17 -to IO_PIN[10]
set_location_assignment PIN_AB18 -to IO_PIN[11]
set_location_assignment PIN_AA18 -to IO_PIN[12]
set_location_assignment PIN_AB19 -to IO_PIN[13]
set_location_assignment PIN_AA19 -to IO_PIN[14]
set_location_assignment PIN_AB20 -to IO_PIN[15]
set_location_assignment PIN_AA20 -to IO_PIN[16]
set_location_assignment PIN_Y21 -to IO_PIN[17]
set_location_assignment PIN_Y22 -to IO_PIN[18]
set_location_assignment PIN_W21 -to IO_PIN[19]
set_location_assignment PIN_W22 -to IO_PIN[20]
set_location_assignment PIN_V21 -to IO_PIN[21]
set_location_assignment PIN_V22 -to IO_PIN[22]
set_location_assignment PIN_U21 -to IO_PIN[23]
set_location_assignment PIN_U22 -to IO_PIN[24]
set_location_assignment PIN_R21 -to IO_PIN[25]
set_location_assignment PIN_R22 -to IO_PIN[26]
set_location_assignment PIN_P21 -to IO_PIN[27]
set_location_assignment PIN_P22 -to IO_PIN[28]
set_location_assignment PIN_N21 -to IO_PIN[29]
set_location_assignment PIN_C22 -to IO_PIN[48]
set_location_assignment PIN_C21 -to IO_PIN[47]
set_location_assignment PIN_D22 -to IO_PIN[46]
set_location_assignment PIN_D21 -to IO_PIN[45]
set_location_assignment PIN_E22 -to IO_PIN[44]
set_location_assignment PIN_E21 -to IO_PIN[43]
set_location_assignment PIN_F22 -to IO_PIN[42]
set_location_assignment PIN_F21 -to IO_PIN[41]
set_location_assignment PIN_H22 -to IO_PIN[40]
set_location_assignment PIN_H21 -to IO_PIN[39]
set_location_assignment PIN_J22 -to IO_PIN[38]
set_location_assignment PIN_J21 -to IO_PIN[37]
set_location_assignment PIN_K22 -to IO_PIN[36]
set_location_assignment PIN_K21 -to IO_PIN[35]
set_location_assignment PIN_L22 -to IO_PIN[34]
set_location_assignment PIN_L21 -to IO_PIN[33]
set_location_assignment PIN_M22 -to IO_PIN[32]
set_location_assignment PIN_M21 -to IO_PIN[31]

Assembly Sheet[edit]