FPGA-ITX-01

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
  • Carry all J8 connections
  • Slot spacing 0.6"

Connectors

J1, J13 - Stereo Audio Jack

• 3.5mm stereo connector
• Jack on card has priority over connection to chassis jack
  • Chassis front panel jack gets disconnected when jack is plugged into the card
• Stereo pinout
  • Tip: This acts as the left channel signal wire
  • Ring: This acts as the right channel signal wire
  • Sleeve: This acts as the common return wire
• 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 44.1 or 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

J2, J9 - 5V PS/2 keyboard connector

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

1. CLK
2. DATA
3. +5V
4. GND

J3 - 5V USB B (power only)

J4 - 3:3:2 VGA (256 colors

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

J5 - SD Card socket

J6, U1 - XIAO RP2040

• 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

J7, J8 - FPGA Adapter Card

• QMTECH FPGA cards
  • EP4CE15 Cyclone IV FPGA Card (tested)
  • EP4CE55 Cyclone IV FPGA Card (untested)
  • Cyclone V FPGA Card] (tested)
  • Cyclone V FPGA Card (untested)
  • QMTECH Cyclone 10CL006 FPGA Card (tested)

J7 - CPU I/O pins

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

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 FPGA 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

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

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

• 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

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

J14 - Power LEDs

J15 - Reset Switch

• Right angle header
• Connects to J8-35
• Attach case reset line here
• Cyclone 10 does not have internal weak pull up for this pin

J16 - Power Switch

• Connects to case power switch
• Shuts off power from USB B
• Does not affect power from RP2040 card

H1 - I/O Slots Power Select Jumper

• Can use 3.3V from FPGA card or on-board 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

170x170mm, Mini-ITX card

• Thin Mini-ITX Based PC System Design Guide - Intel
• MINI ITX SPEC V2 0
• Mini-ITX Interface Specification, version 1.1/1.2
• Thin Mini-ITX Based All-In-One PC Compliance Requirements
• 4mm Mounting holes for Mini ITX case
  • Isolated pads
• M06 Mini Desktop Case J8G3
• TX02 Mini Desktop Case J6E2
• MATX ATX PC Test Bench Open Air Frame Overclock Case

Card Mechanicals

Card Height

Back Panel

Case Cabling

Expansion Cards

FPGA-ITX-01 expansion cards plug into the expansion connectors to expand the functionality of the FPGA design.

ITX-65C816

65C816 CPU module.

ITX-PI-PICO

• Raspberry Pi Pico Module

ITX-BKOUT

• Breakout card which connects to the pins of the expansion connectors with power/ground down the center of the card.

ITX-SWLEDs

• 8 pushbuttons, 8 slide switches, 16 LEDs.

Mechanicals

• QMTECH FPGA card

Multicomp Builds

• M6502_VGA_Int65C816_Cyclone10

Revision History

Rev 2

• Moved upper right mounting hole
• Fixed R23 DRC
• Add pull-up resistors for input only pins
  • J8-35, 36, 57, 58
• Move silkscreen pin numbers around FPGA a bit
• Widen JTAG silkscreen block
• Verified pin No Connects are correct
• Added Rev 2 marking

Rev 1

• Upper right mounting hole is in wrong spot
  • At 0.9" from edge, should be 0.9" from upper left mounting hole
  • Not big issue, no mechanical interference on board, just use 3 mounting holes
• Yabs = 2.47480315, change to 2.87480315
• R23 DRC error
  • Overshot pin on rear side
  • Verified right pin is connected
• Input only pins do not support internal pull-ups
• Missing Rev marking (use P-Touch label)

Assembly Sheet

• FPGA-ITX-01 Rev 1 Assembly Sheet