FPGA-ITX-01

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RETRO-FPGA-ITX FRONT 3D.png

Features

  • FPGA Adapter Card
  • 170x170mm, Mini-ITX card
  • 1 MB SRAM
  • 5V PS/2 keyboard connector
  • SD Card socket
  • 3:3:2 VGA (256 colors
  • 5V USB B (power only)
  • XIAO RP2040
  • Stereo Audio Jack
  • 3 I/O slots

Stereo Audio Jack (J1, J13)

  • 3.5mm stereo socket
  • Jack on card has priority over connection to chassis jack
    • Front panel gets disconnected when jack is plugged into the card
  • J13 is header to case jack
  • Minimal LP filter
  • FPGA Sound on our GitHub
  • Using PWM to generate sound
  • How to Generate Sound using PWM
  • Run at frequency well above audio, say 48 KHz
  • Output of filter with 50% duty cycle will produce smoothed average voltage at the mid-point
  • Values > 50% duty cycle will produce a voltage higher than the average
  • Values < 50% duty cycle will produce a voltage lower than the average

RETRO-FPGA-AUDIO-J3.PNG

5V PS/2 keyboard connector (J4, J9)

  • PS/2 connector
  • 5V to 3.3V level shifter

RETRO-FPGA-IYX PS2 J2 P2.PNG

5V USB B (power only) (J3)

RETRO-FPGA-IYX USB-PWR.PNG

3:3:2 VGA (256 colors (J4)

  • VGA connector
    • 8-bit video (3:3:2)

RETRO-FPGA-VGA.PNG

SD Card socket (J5)

RETRO-FPGA-SD CARD.PNG

FPGA Adapter Card (J7, J8)

CPU I/O pins (J7)

  • Connects to SRAM, PS/2, VGA, SD card

RETRO-FPGA-ITX J7.PNG

J7 Pins list
U7 PIN EP4CE15 EP4CE55 5CEFA2 CYC 10 FUNCTION U7 PIN EP4CE15 EP4CE55 5CEFA2 CYC 10 FUNCTION
1 GND GND GND GND GND 2 GND GND GND GND GND
3 3.3V 3.3V 3.3V 3.3V 3.3V 4 3.3V 3.3V 3.3V 3.3V 3.3V
5 GND GND GND GND GND 6 GND GND GND GND GND
7 PIN_R1 PIN_R1 PIN_AA2 PIN_G1 AUDIOR 8 PIN_R2 PIN_R2 PIN_AA1 PIN_G2 AUDIOL
9 PIN_P1 PIN_P1 PIN_Y3 PIN_D1 PS2DAT 10 PIN_P2 PIN_P2 PIN_W2 PIN_C2 PS2CLK
11 PIN_N1 PIN_N1 PIN_U1 PIN_B1 SRAMA4 12 PIN_N2 PIN_N2 PIN_U2 PIN_F5 SRAMA5
13 PIN_M1 PIN_M1 PIN_N1 PIN_D3 SRAMA3 14 PIN_M2 PIN_M2 PIN_N2 PIN_C3 SRAMA6
15 PIN_J1 PIN_J1 PIN_L1 PIN_B3 SRAMA2 16 PIN_J2 PIN_J2 PIN_L2 PIN_A3 SRAMA7
17 PIN_H1 PIN_H1 PIN_G1 PIN_B4 SRAMA1 18 PIN_H2 PIN_H2 PIN_G2 PIN_A4 SRAM0E_N
19 PIN_F1 PIN_F1 PIN_E2 PIN_E5 SRAMA0 20 PIN_F2 PIN_F2 PIN_D3 PIN_A2 SRAMA8
21 PIN_E1 PIN_E1 PIN_C1 PIN_D4 SRAMCS_N 22 PIN_D2 PIN_D2 PIN_C2 PIN_E6 SRAMD7
23 PIN_C1 PIN_C1 PIN_G6 PIN_C6 SRAMD0 24 PIN_C2 PIN_C2 PIN_H6 PIN_D6 SRAMD6
25 PIN_B1 PIN_B1 PIN_G8 PIN_B5 SRAMD1 26 PIN_B2 PIN_B2 PIN_H8 PIN_A5 SRAMD5
27 PIN_B3 PIN_B3 PIN_F7 PIN_B6 SRAMD2 28 PIN_A3 PIN_A3 PIN_E7 PIN_A6 SRAMD4
29 PIN_B4 PIN_B4 PIN_D6 PIN_B7 SRAMD3 30 PIN_A4 PIN_A4 PIN_C6 PIN_A7 SRAMA9
31 PIN_C4 PIN_C4 PIN_E9 PIN_D8 SRAMWE_N 32 PIN_C3 PIN_C3 PIN_D9 PIN_C8 SRAMA10
33 PIN_B5 PIN_B5 PIN_B5 PIN_D9 SRAMA19 34 PIN_A5 PIN_A5 PIN_A5 PIN_C9 SRAMA11
35 PIN_B6 PIN_B6 PIN_B6 PIN_B8 SRAMA18 36 PIN_A6 PIN_A6 PIN_B7 PIN_A8 SRAMA12
37 PIN_B7 PIN_B7 PIN_A7 PIN_B9 SRAMA17 38 PIN_A7 PIN_A7 PIN_A8 PIN_A9 SRAMA13
39 PIN_B8 PIN_B8 PIN_A9 PIN_E9 SRAMA16 40 PIN_A8 PIN_A8 PIN_A10 PIN_E8 SRAMA14
41 PIN_B9 PIN_B9 PIN_B10 PIN_E11 REDHI 42 PIN_A9 PIN_A9 PIN_C9 PIN_E10 SRAMA15
43 PIN_B10 PIN_B10 PIN_G10 PIN_A10 REDLO 44 PIN_A10 PIN_A10 PIN_F10 PIN_B10 REDMID
45 PIN_B13 PIN_B13 PIN_C11 PIN_D12 GRNMID 46 PIN_A13 PIN_A13 PIN_B11 PIN_D11 GRNHI
47 PIN_B14 PIN_B14 PIN_B12 PIN_B11 BLUHI 48 PIN_A14 PIN_A14 PIN_A12 PIN_A11 GRNLO
49 PIN_B15 PIN_B15 PIN_E12 PIN_B12 HSYNC 50 PIN_A15 PIN_A15 PIN_D12 PIN_A12 BLULO
51 PIN_B16 PIN_B16 PIN_D13 PIN_B13 SDCS_N 52 PIN_A16 PIN_A16 PIN_C13 PIN_A13 VSYNC
53 PIN_B17 PIN_B17 PIN_B13 PIN_B14 SD_SCK 54 PIN_A17 PIN_A17 PIN_A13 PIN_A14 SD_MOSI
55 PIN_B18 PIN_B18 PIN_A15 PIN_D14 USBTX/FPGARX 56 PIN_A18 PIN_A18 PIN_A14 PIN_C14 SD_MISO
57 PIN_B19 PIN_B19 PIN_B15 PIN_B16 USBCTS/FPGARTS 58 PIN_A19 PIN_A19 PIN_C15 PIN_A15 UBSRTS/FPGACTS
59 PIN_B20 PIN_B20 PIN_C16 PIN_C16 CD_DET 60 PIN_A20 PIN_A20 PIN_B16 PIN_C15 USBRX/FPGATX
61 GND GND GND GND GND 62 GND GND GND GND GND
63 5V 5V 5V 5V 5V 64 5V 5V 5V 5V 5V

J8 - I/O pins (J8)

  • All pins are usable and are daisy-chained to 3 expansion connectors
  • Cyclone 10 notes
    • Cannot place output or bidirectional pin J8IO[35] in input pin location M16
    • Cannot place output or bidirectional pin J8IO[36] in input pin location M15
    • Cannot place output or bidirectional pin J8IO[57] in input pin location E16
    • Cannot place output or bidirectional pin J8IO[58] in input pin location E15


RETRO-FPGA-ITX J8.PNG

U8 PIN EP4CE15 EP4CE55 5CEFA2 10C1006 U8 PIN EP4CE15 EP4CE55 5CEFA2 10C1006
1 GND GND GND GND 2 GND GND GND GND
3 3.3V 3.3V 3.3V 3.3V 4 3.3V 3.3V 3.3V 3.3V
5 GND GND GND GND 6 GND GND GND GND
7 PIN_AA13 PIN_AA13 PIN_AA14 PIN_R9 8 PIN_AB13 PIN_AB13 PIN_AA13 PIN_T9
9 PIN_AA14 PIN_AA14 PIN_AA15 PIN_R10 10 PIN_AB14 PIN_AB14 PIN_AB15 PIN_T10
11 PIN_AA15 PIN_AA15 PIN_Y15 PIN_R11 12 PIN_AB15 PIN_AB15 PIN_Y14 PIN_T11
13 PIN_AA16 PIN_AA16 PIN_AB18 PIN_R12 14 PIN_AB16 PIN_AB16 PIN_AB17 PIN_T12
15 PIN_AA17 PIN_AA17 PIN_Y17 PIN_N9 16 PIN_AB17 PIN_AB17 PIN_Y16 PIN_M9
17 PIN_AA18 PIN_AA18 PIN_AA18 PIN_M10 18 PIN_AB18 PIN_AB18 PIN_AA17 PIN_P9
19 PIN_AA19 PIN_AA19 PIN_AA20 PIN_P11 20 PIN_AB19 PIN_AB19 PIN_AA19 PIN_N11
21 PIN_AA20 PIN_AA20 PIN_Y20 PIN_R13 22 PIN_AB20 PIN_AB20 PIN_Y19 PIN_T13
23 PIN_Y22 PIN_Y22 PIN_AB21 PIN_T15 24 PIN_Y21 PIN_Y21 PIN_AB20 PIN_T14
25 PIN_W22 PIN_W22 PIN_AA22 PIN_N12 26 PIN_W21 PIN_W21 PIN_AB22 PIN_M11
27 PIN_V22 PIN_V22 PIN_W22 PIN_R14 28 PIN_V21 PIN_V21 PIN_Y22 PIN_N13
29 PIN_U22 PIN_U22 PIN_Y21 PIN_N14 30 PIN_U21 PIN_U21 PIN_W21 PIN_P14
31 PIN_R22 PIN_R22 PIN_U22 PIN_P16 32 PIN_R21 PIN_R21 PIN_V21 PIN_R16
33 PIN_P22 PIN_P22 PIN_V20 PIN_N16 34 PIN_P21 PIN_P21 PIN_W19 PIN_N15
35 PIN_N22 PIN_N22 PIN_U21 PIN_M16 * 36 PIN_N21 PIN_N21 PIN_U20 PIN_M15 *
37 PIN_M22 PIN_M22 PIN_R22 PIN_L16 38 PIN_M21 PIN_M21 PIN_T22 PIN_L15
39 PIN_L22 PIN_L22 PIN_P22 PIN_P15 40 PIN_L21 PIN_L21 PIN_R21 PIN_M12
41 PIN_K22 PIN_K22 PIN_T20 PIN_L14 42 PIN_K21 PIN_K21 PIN_T19 PIN_L13
43 PIN_J22 PIN_J22 PIN_P16 PIN_K16 44 PIN_J21 PIN_J21 PIN_P17 PIN_K15
45 PIN_H22 PIN_H22 PIN_N20 PIN_K12 46 PIN_H21 PIN_H21 PIN_N21 PIN_J12
47 PIN_F22 PIN_F22 PIN_M21 PIN_J14 48 PIN_F21 PIN_F21 PIN_M20 PIN_J13
49 PIN_E22 PIN_E22 PIN_M18 PIN_K11 50 PIN_E21 PIN_E21 PIN_N19 PIN_J11
51 PIN_D22 PIN_D22 PIN_L18 PIN_G11 52 PIN_D21 PIN_D21 PIN_L19 PIN_F11
53 PIN_C22 PIN_C22 PIN_M22 PIN_F13 54 PIN_C21 PIN_C21 PIN_L22 PIN_F14
55 PIN_B22 PIN_B22 PIN_L17 PIN_F10 56 PIN_B21 PIN_B21 PIN_K17 PIN_F9
57 PIN_N20 PIN_N20 PIN_K22 PIN_E16 * 58 PIN_N19 PIN_N19 PIN_K21 PIN_E15 *
59 PIN_M20 PIN_M20 PIN_M16 PIN_D16 60 PIN_M19 PIN_M19 PIN_N16 PIN_D15
61 GND GND GND GND 62 GND GND GND GND
63 5V 5V 5V 5V 64 5V 5V 5V 5V

3 I/O slots IO_1-IO_3 (J10-J12)

  • 3 I/O connectors
    • 2x40 headers
    • First 64-pins match pinout of J8
    • Last 16 pins are chained together and do not connect to the FPGA (IOX65-80)
  • Cyclone 10 notes
    • Cannot place output or bidirectional pin J8IO[35] in input pin location M16
    • Cannot place output or bidirectional pin J8IO[36] in input pin location M15
    • Cannot place output or bidirectional pin J8IO[57] in input pin location E16
    • Cannot place output or bidirectional pin J8IO[58] in input pin location E15

RETRO-FPGA-IYX IO Conns.PNG

U8 PIN EP4CE15 EP4CE55 5CEFA2 10C1006 U8 PIN EP4CE15 EP4CE55 5CEFA2 10C1006
1 GND GND GND GND 2 GND GND GND GND
3 3.3V 3.3V 3.3V 3.3V 4 3.3V 3.3V 3.3V 3.3V
5 GND GND GND GND 6 GND GND GND GND
7 PIN_AA13 PIN_AA13 PIN_AA14 PIN_R9 8 PIN_AB13 PIN_AB13 PIN_AA13 PIN_T9
9 PIN_AA14 PIN_AA14 PIN_AA15 PIN_R10 10 PIN_AB14 PIN_AB14 PIN_AB15 PIN_T10
11 PIN_AA15 PIN_AA15 PIN_Y15 PIN_R11 12 PIN_AB15 PIN_AB15 PIN_Y14 PIN_T11
13 PIN_AA16 PIN_AA16 PIN_AB18 PIN_R12 14 PIN_AB16 PIN_AB16 PIN_AB17 PIN_T12
15 PIN_AA17 PIN_AA17 PIN_Y17 PIN_N9 16 PIN_AB17 PIN_AB17 PIN_Y16 PIN_M9
17 PIN_AA18 PIN_AA18 PIN_AA18 PIN_M10 18 PIN_AB18 PIN_AB18 PIN_AA17 PIN_P9
19 PIN_AA19 PIN_AA19 PIN_AA20 PIN_P11 20 PIN_AB19 PIN_AB19 PIN_AA19 PIN_N11
21 PIN_AA20 PIN_AA20 PIN_Y20 PIN_R13 22 PIN_AB20 PIN_AB20 PIN_Y19 PIN_T13
23 PIN_Y22 PIN_Y22 PIN_AB21 PIN_T15 24 PIN_Y21 PIN_Y21 PIN_AB20 PIN_T14
25 PIN_W22 PIN_W22 PIN_AA22 PIN_N12 26 PIN_W21 PIN_W21 PIN_AB22 PIN_M11
27 PIN_V22 PIN_V22 PIN_W22 PIN_R14 28 PIN_V21 PIN_V21 PIN_Y22 PIN_N13
29 PIN_U22 PIN_U22 PIN_Y21 PIN_N14 30 PIN_U21 PIN_U21 PIN_W21 PIN_P14
31 PIN_R22 PIN_R22 PIN_U22 PIN_P16 32 PIN_R21 PIN_R21 PIN_V21 PIN_R16
33 PIN_P22 PIN_P22 PIN_V20 PIN_N16 34 PIN_P21 PIN_P21 PIN_W19 PIN_N15
35 PIN_N22 PIN_N22 PIN_U21 PIN_M16 36 PIN_N21 PIN_N21 PIN_U20 PIN_M15
37 PIN_M22 PIN_M22 PIN_R22 PIN_L16 38 PIN_M21 PIN_M21 PIN_T22 PIN_L15
39 PIN_L22 PIN_L22 PIN_P22 PIN_P15 40 PIN_L21 PIN_L21 PIN_R21 PIN_M12
41 PIN_K22 PIN_K22 PIN_T20 PIN_L14 42 PIN_K21 PIN_K21 PIN_T19 PIN_L13
43 PIN_J22 PIN_J22 PIN_P16 PIN_K16 44 PIN_J21 PIN_J21 PIN_P17 PIN_K15
45 PIN_H22 PIN_H22 PIN_N20 PIN_K12 46 PIN_H21 PIN_H21 PIN_N21 PIN_J12
47 PIN_F22 PIN_F22 PIN_M21 PIN_J14 48 PIN_F21 PIN_F21 PIN_M20 PIN_J13
49 PIN_E22 PIN_E22 PIN_M18 PIN_K11 50 PIN_E21 PIN_E21 PIN_N19 PIN_J11
51 PIN_D22 PIN_D22 PIN_L18 PIN_G11 52 PIN_D21 PIN_D21 PIN_L19 PIN_F11
53 PIN_C22 PIN_C22 PIN_M22 PIN_F13 54 PIN_C21 PIN_C21 PIN_L22 PIN_F14
55 PIN_B22 PIN_B22 PIN_L17 PIN_F10 56 PIN_B21 PIN_B21 PIN_K17 PIN_F9
57 PIN_N20 PIN_N20 PIN_K22 PIN_E16 58 PIN_N19 PIN_N19 PIN_K21 PIN_E15
59 PIN_M20 PIN_M20 PIN_M16 PIN_D16 60 PIN_M19 PIN_M19 PIN_N16 PIN_D15
61 GND GND GND GND 62 GND GND GND GND
63 5V 5V 5V 5V 64 5V 5V 5V 5V
65 IOX_65 IOX_65 IOX_65 IOX_65 66 IOX_66 IOX_66 IOX_66 IOX_66
67 IOX_67 IOX_67 IOX_67 IOX_67 68 IOX_68 IOX_68 IOX_68 IOX_68
69 IOX_69 IOX_69 IOX_69 IOX_69 70 IOX_70 IOX_70 IOX_70 IOX_70
71 IOX_71 IOX_71 IOX_71 IOX_71 72 IOX_72 IOX_72 IOX_72 IOX_72
73 IOX_73 IOX_73 IOX_73 IOX_73 74 IOX_74 IOX_74 IOX_74 IOX_74
75 IOX_75 IOX_75 IOX_75 IOX_75 76 IOX_76 IOX_76 IOX_76 IOX_76
77 IOX_77 IOX_77 IOX_77 IOX_77 78 IOX_78 IOX_78 IOX_78 IOX_78
79 IOX_79 IOX_79 IOX_79 IOX_79 80 IOX_80 IOX_80 IOX_80 IOX_80

XIAO RP2040 (U1, J6)

  • All pins are bought out to J1, J2 headers
  • Used as an FTDI card replacement
  • Tx/Rx/RTS/CTS brought to FPGA card
  • Connected to SD Card
    • SD Card is shared with FPGA
    • Can be used as replacement disk drive for BASIC Load/Save commands

RETRO-FPGA-QTPY J6.PNG

I/O Slots Power Select Jumper (H1)

  • Can use 3.3V from FPGA card or on-noard 3.3V regulator

1 MB SRAM

  • 1MB SRAM
    • IS62WV10248EBLL-45TLI, SRAM. Async, 1Mbx8, 45ns
    • For banked use in CP/M and as RAM Disk in other 8-bit micro designs

RETRO-FPGA-SRAM.PNG

170x170mm, Mini-ITX card

MINI-ITX CASE-03.jpg

Card Mechanicals

Mini-ITX Mechs.PNG

Card Height

Mini-ITX ComponentHeight Mechs.PNG

Back Panel

Mini-ITX BackPanel Mechs.PNG

Expansion Cards

Mechanicals

RETRO-FPGA-IYX MECHS.PNG

QMTECH FPGA EP4CE15.jpg

Assembly Sheet

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