Input/Output

Overview

The Jay40 provides access to 39 of the FPGA's programmable I/O pins. These pins are exposed through the board's two 24-pin connectors and are labeled D0 through D38. Each programmable I/O can be configured as an input, output, or tri-state buffer. In addition, an internal pull-up resistor can be enabled for each pin. For more detail, please refer to the "iCE40 Family Data Sheet."

The board's connectors also provide the pins required to program the FPGA and flash chip. This is done through a standard SPI interface (CS, SCK, MOSI, and MISO) and two dedicated FPGA configuration pins, CRST and CDN.

For power, the board includes several 3V3 and GND pins, as well as a 5V pin. Depending on the setup, these power pins be used as either power inputs or power outputs.

Connector Pinout

The board's pinout is shown in __. Aside from the single 5V power pin, all of the board's I/O operate at a 3.3 V logic level.

Pin	Pin Name	Description	Pin	Pin Name	Description
1	3V3	3.3 V Power	15	3V3	3.3 V Power
2	GND	Ground	16	GND	Ground
3	D0	Programmable I/O	17	D8	Programmable I/O
4	D1	Programmable I/O	18	D9	Programmable I/O
5	D2	Programmable I/O	19	D10	Programmable I/O
6	D3	Programmable I/O	20	D11	Programmable I/O
7	D4	Programmable I/O	21	D12	Programmable I/O
8	D5	Programmable I/O	22	D13	Programmable I/O
9	D6	Programmable I/O	23	D14	Programmable I/O
10	D7	Programmable I/O	24	D15	Programmable I/O
11	MOSI	SPI Master Out Slave In	25	CS	SPI Chip Select
12	MISO	SPI Master In Slave Out	26	SCK	SPI Serial Clock
13	GND	Ground	27	CDN	Configuration Done
14	3V3	3.3 V Power	28	CRST	Configuration Reset

Pin	Pin Name	Description	Pin	Pin Name	Description
1	D16	Programmable I/O	15	5V	5 V Power
2	D17	Programmable I/O	16	D28	Programmable I/O
3	D18	Programmable I/O	17	D29	Programmable I/O
4	D19	Programmable I/O	18	D30	Programmable I/O
5	D20	Programmable I/O	19	D31	Programmable I/O
6	D21	Programmable I/O	20	D32	Programmable I/O
7	D22	Programmable I/O	21	D33	Programmable I/O
8	D23	Programmable I/O	22	D34	Programmable I/O
9	D24	Programmable I/O	23	D35	Programmable I/O
10	D25	Programmable I/O	24	D36	Programmable I/O
11	D26	Programmable I/O	25	D37	Programmable I/O
12	D27	Programmable I/O	26	D38	Programmable I/O
13	GND	Ground	27	GND	Ground
14	3V3	3.3 V Power	28	3V3	3.3 V Power

Pin Mapping

Pin Name	Ball Number	Ball Function
D0	G1	IOL_24B
D1	H1	IOB_54
D2	H2	IOL_26B
D3	J3	IOB_57
D4	J4	IOB_70
D5	J9	IOR_110
D6	G9	IOR_112
D7	D9	IOR_119
D8	F1	IOL_22A
D9	G4	IOB_81_GBIN5
D10	J1	IOB_55
D11	J2	IOB_56
D12	H4	IOB_82_GBIN4
D13	J8	IOR_109
D14	H9	IOR_111
D15	E8	IOR_140_GBIN3
D16	E1	IOL_10B
D17	E2	IOL_13A
D18	D2	IOL_7A
D19	C2	IOL_2A
D20	A1	IOT_224
D21	A2	IOT_221
D22	A3	IOT_217
D23	B5	IOT_188
D24	B6	IOT_183
D25	B7	IOT_180
D26	B8	IOT_170
D27	B9	IOT_120
D28	D1	IOL_10A
D29	C1	IOL_3B
D30	B1	IOL_3A
D31	B2	IOL_2B
D32	B3	IOT_218
D33	A4	IOT_208
D34	A6	IOT_185
D35	A7	IOT_177
D36	A8	IOT_174
D37	A9	IOR_116
D38	C9	IOR_148
CS	F7	IOB_108_SS
SCK	G7	IOB_107_SCK
MOSI	H7, G6	IOB_106_SDI, IOB_105_SDO
MISO	G6, H7	IOB_105_SDO, IOR_106_SDI
CRST	H6	CRESET_B
CDN	E6	CDONE