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

Stereo Audio Jack (J1)

• 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

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

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

5V USB B (power only) (J3)

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

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

SD Card socket (J5)

FPGA Adapter Card (J7, J8)

• 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)

CPU I/O pins (J7)

• 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 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

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
• 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

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

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

170x170mm, Mini-ITX card

• Mounting holes for Mini ITX case
• Ebay example

Card Mechanicals

Card Height

Back Panel

Expansion Cards

• ITX-65C816
• ITX-PI-PICO

Mechanicals

Assembly Sheet

• RETRO-FPGA-IYX Rev 1 Assembly Sheet