ONDA SOM/ONDA Evaluation Kit/Interfaces and Connectors/Voltage selections

History
Issue Date	Notes
2026/07/01	First documentation release

Voltage selections

BoraXEVB provides several configuration jumpers that allow to easily select the voltages used for PL's I/O banks. The following tables lists some of the allowed combinations used to select the most common voltage values. There are other combination available. However, some of them are not allowed and may cause permanent hardware damages to the Zynq UltraScale+ part.

Note that in the BoraXEVB schematic the rail names differ from the ONDA SoM nomenclature:

ONDA SoM				BoraXEVB
Bank	Type	PL rail	Voltage range	Rail	Selector	Default voltage
Bank 43	HD	VDDIO_BANK43-44	1.2V to 3.3V	VDDIO_BANK13	JP25	1.8V
Bank 44
Bank 65	HP	VDDIO_BANK65	1.0V to 1.8V	VDDIO_BANK34	JP28	1.8V
Bank 66		VDDIO_BANK66

Even if PL's banks are independent, there are two exception:

• bank 43 and bank 44 share the same supply voltage (constrained on ONDA SoM): this voltage is selected via JP25.

• bank 65 and bank 66 have the same supply voltage (constrained on BoraXEVB): this voltage is selected via JP28. This configuration is in accordance with default routing of signals used for FMC connector.

Examples of valid combinations for Zynq UltraScale+ XCZU5-based SOMs

Zynq Ultrascale+ Bank #43 and #44 (HD)

BoraXEVB VDDIO_BANK13 nominal voltage [V]	JP25.1-2	JP25.3-4	JP25.5-6	JP25.7-8	JP25.9-10	JP25.11-12
1.2	open	open	closed	closed	closed	open
1.5	open	closed	open	closed	open	open
1.8 (*)	open	closed	closed	open	closed	open
2.5	closed	open	closed	open	open	open
3.3	closed	closed	closed	open	open	open

Zynq Ultrascale+ Bank #65 and #66 (HP)

BoraXEVB VDDIO_BANK34 nominal voltage [V]	JP28.1-2	JP28.3-4	JP28.5-6	JP28.7-8	JP28.9-10	JP28.11-12
1.2	open	open	open	open	closed	open
1.5	open	open	open	closed	open	open
1.8 (**)	open	open	closed	open	open	open

Advanced information about voltage selection connectors

BoraXEVB VDDIO_BANK13 selection connector (JP25)

JP25 is a 12-pin 6x2x2.54 pitch vertical header used for the selection - through jumpers - of the bank supply voltages. The following table reports the pinout of the connector:

Pin#	Pin name	Function
2	LDO_B13_1V6	adds +1.6V to VDDIO_BANK13
4	LDO_B13_800mV	adds +800mV to VDDIO_BANK13
6	LDO_B13_400mV	adds +400mV to VDDIO_BANK13
8	LDO_B13_200mV	adds +200mV to VDDIO_BANK13
10	LDO_B13_100mV	adds +100mV to VDDIO_BANK13
12	LDO_B13_50mV	adds +50mV to VDDIO_BANK13
1, 3, 5, 7, 9, 11	DGND	-

The jumper configurations are:

1. No jumpers installed -> DC output for VDDIO_BANK13 is 500mV
2. Jumper on 1-2 -> adds 1.6V to VDDIO_BANK13 above the default 500mV
3. Jumper on 3-4 -> adds 800mV to VDDIO_BANK13 above the default 500mV
4. Jumper on 5-6 -> adds 400mV to VDDIO_BANK13 above the default 500mV
5. Jumper on 7-8 -> adds 200mV to VDDIO_BANK13 above the default 500mV
6. Jumper on 9-10 -> adds 100mV to VDDIO_BANK13 above the default 500mV
7. Jumper on 11-12 -> adds 50mV to VDDIO_BANK13 above the default 500mV

(*) default configuration for BoraXEVB VDDIO_BANK13 is @ 1.8V (500mV + 800mV + 400mV + 100mV):

1. Jumper on 3-4 -> adds 800mV to VDDIO_BANK13 above the default 500mV
2. Jumper on 5-6 -> adds 400mV to VDDIO_BANK13
3. Jumper on 9-10 -> adds 100mV to VDDIO_BANK13

BoraXEVB VDDIO_BANK34 selection connector (JP28)

JP28 is a 12-pin 6x2x2.54 pitch vertical header used for the selection - through jumpers - of the bank supply voltages. The following table reports the pinout of the connector:

Pin#	Pin name	Function
2	VADJ_FB (22K)	selects 3.3V VDDIO_BANK34
4	VADJ_FB (30K9)	selects 2.5V VDDIO_BANK34
6	VADJ_FB (51K1)	selects 1.8V VDDIO_BANK34
8	VADJ_FB (68K)	selects 1.5V VDDIO_BANK34
10	VADJ_FB (100K)	selects 1.2V VDDIO_BANK34
12	RFU	Reserved
1, 3, 5, 7, 9, 11	DGND	-

The jumper configurations are:

1. Jumper on 1-2 -> supply VADJ with 3.3V
2. Jumper on 3-4 -> supply VADJ with 2.5V
3. Jumper on 5-6 -> supply VADJ with 1.8V
4. Jumper on 7-8 -> supply VADJ with 1.5V
5. Jumper on 9-10 -> supply VADJ with 1.2V

(**) default configuration for BoraXEVB VDDIO_BANK34 is @1.8V (Jumper on 5-6)