TS-4100 FPGA

The TS-4100 FPGA registers are accessed over I2C. The /sys/class/gpio driver provides access to the IO using these registers. See the #GPIO section for more information on the recommended method for IO access.

The FPGA is available at I2C addresses 0x28-0x2f. First write the address which is 16-bits, followed by the data which is 8-bits.

The first registers 0-127 are used to control the GPIO. Registers 128-255 control the crossbar for the various pins. Use the IO offsets int the second table for the GPIO and CROSSBAR registers.

GPIO_n Register

Address	Bits	Description
127:0	7:3	Reserved (Write 0)
	2	GPIOn Input Data
	1	GPIOn Output Data
	0	GPIOn Output Enable
128:255	7	CROSSBARn GPIO mode
	6:0	CROSSBARn Value
271:256	7:0	GPIOn Bank Input
287:272	7:0	GPIOn Bank Output Data
288:303	7:0	GPIOn Bank Output Enable (1=out)
304	7:0	Model Number MSB (0x41)
305	7:0	Model Number LSB (0x00)
306	7:0	FPGA Rev
8191:307	7:0	Reserved
16384:8192	7:0	ZPU RAM access

In the above table the GPIO, Crossbar, and Bank registers will use the following IO. The bank registers should divide the IO number by 8 to get the offset, and use the modulus to get the bit number.

FPGA IO

IO Number	Pad	Crossbar support	Direction
1	UART3_TXD_PAD (ttymxc2)	Y	Input
2	UART3_RTS_PADn (ttymxc2)	Y	Input
3	UART4_TXD_PAD (ttymxc3)	Y	Input
4	UART7_TXD_PAD (ttymxc6)	Y	Input
5	UART_A_RXD_PAD	Y	Input
6	UART_B_RXD_PAD	Y	Input
7	UART_C_RXD_PAD	Y	Input
8	UART_D_RXD_PAD	Y	Input
9	SPARE_1_PAD	Y	GPIO
10	SPARE_2_PAD	Y	GPIO
11	UART_3_RXD_PAD (ttymxc2)	DIO+WIFI	Output
12	UART_3_CTS_PADN (ttymxc2)	DIO+WIFI	Output
13	UART4_RXD_PADN (ttymxc3)	DIO+WIFI	Output
14	UART7_RXD_PAD (ttymxc6)	DIO+WIFI	Output
15	UART_A_TXD_PAD	DIO+WIFI	Output
16	UART_B_TXD_PAD	DIO+WIFI	Output
17	UART_C_TXD_PAD	DIO+WIFI	Output
18	UART_D_TXD_PAD	DIO+WIFI	Output
19	WIFI_TXD_PAD	DIO+WIFI	Output
20	WIFI_CTS_PAD	DIO+WIFI	Output
21	ZPU_BREAK	N	Input
22	ZPU_RESET	N	Output
23	EN_WIFI_PWR_PAD	N	Output
24	WIFI_RESET_PAD	N	Output
25	EN_USB_HOST_5V_PAD	N	Output
26	EN_LCD_3V3_PAD	N	Output
27	EN_SD_POWER_PAD	N	Output
28	OFF_BD_RESET_PADN	N	Output
29	EN_SW_3V3_PADN	N	Output
30	GREEN_LED_PADN	N	Output
31	RED_LED_PADN	N	Output
78:32	DIO_PAD[46:0]	UART+SPARE pins	Output
79	WIFI_RXD_PAD	Y	Input
80	WIFI_RTS_PAD	Y	Input