BORA Xpress SOM/BORA Xpress Evaluation Kit/Interfaces and Connectors/Voltage selections

History
Issue Date	Notes
2022/01/25	New documentation page

Voltage selections

PL's I/O banks voltage can be selected via configuration jumpers. It is worth remembering that:

• each bank must be powered even if none of its I/Os is used
• voltage selection must be done before powering up the board.

The following table recaps the characteristics of the PL's I/O banks, in terms of allowable power supplies.

SoM	Zynq p/n	Bank #34		Bank #13		Bank #35
		Type [1]	I/O voltage setting	Type [1]	I/O voltage setting	Type [1]	I/O voltage setting
BoraX	7015 (CLG485 package)	HR (1.2 - 3.3V)	User defined	HR (1.2 - 3.3V)	User defined	HR (1.2 - 3.3V)	User defined
	7030 (SBG485 package)	HP (1.2 - 1.8V)	User defined	HR (1.2 - 3.3V)	User defined	HP (1.2 - 1.8V)	User defined
Bora Lite	7007S/7010 (CLG400 package)	HR (1.2 - 3.3V)	User defined	HR (1.2 - 3.3V)	User defined	HR (1.2 - 3.3V)	User defined
	7014S/7020 (CLG400 package)	HR (1.2 - 3.3V)	User defined	HR (1.2 - 3.3V)	User defined	HR (1.2 - 3.3V)	User defined

[1]

• HR = High Range
• HP = High Performance

BoraXEVB voltage selection jumpers

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 part.

Since characteristics of PL's I/O banks differ between Zynq 7015 and 7030 parts, the valid combinations are not the same for all of the BoraX models. Please refer to the following sections for more details.

Even if PL's banks are independent, default configuration of BoraXEVB is such that

• bank 34 and bank 35 have the same supply voltage
• 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 7030-based SOMs (default option for BXELK)

Bank #13 (HR)

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

Bank #35 (HP)

Nominal voltage [V]	JP27.1-2	JP27.3-4	JP27.5-6	JP27.7-8	JP27.9-10	JP27.11-12
1.2	open	open	closed	closed	closed	open
1.5	open	closed	open	closed	open	open
1.8	open	closed	closed	open	closed	open

Bank #34 (HP)

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

Examples of valid combinations for Zynq 7015-based SOMs

Bank #13 (HR)

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

Bank #35 (HR)

Nominal voltage [V]	JP27.1-2	JP27.3-4	JP27.5-6	JP27.7-8	JP27.9-10	JP27.11-12
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

Bank #34 (HR)

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
2.5	open	closed	open	open	open	open
3.3	closed	open	open	open	open	open

Advanced information about voltage selection connectors

Bank 13 VDDIO 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	Notes
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

The default configuration is VDDIO_BANK13 @ 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

Bank 35 VDDIO selection connector (JP27)

JP27 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	Notes
2	LDO_B35_1V6	adds +1.6V to VDDIO_BANK35	-
4	LDO_B35_800mV	adds +800mV to VDDIO_BANK35	-
6	LDO_B35_400mV	adds +400mV to VDDIO_BANK35	-
8	LDO_B35_200mV	adds +200mV to VDDIO_BANK35	-
10	LDO_B35_100mV	adds +100mV to VDDIO_BANK35	-
12	LDO_B35_50mV	adds +50mV to VDDIO_BANK35	-
1, 3, 5, 7, 9, 11	DGND	-	-

The jumper configurations are:

1. No jumpers installed -> DC output for VDDIO_BANK35 is 500mV
2. Jumper on 1-2 -> adds 1.6V to VDDIO_BANK35 above the default 500mV
3. Jumper on 3-4 -> adds 800mV to VDDIO_BANK35 above the default 500mV
4. Jumper on 5-6 -> adds 400mV to VDDIO_BANK35 above the default 500mV
5. Jumper on 7-8 -> adds 200mV to VDDIO_BANK35 above the default 500mV
6. Jumper on 9-10 -> adds 100mV to VDDIO_BANK35 above the default 500mV
7. Jumper on 11-12 -> adds 50mV to VDDIO_BANK35 above the default 500mV

The DEFAULT configuration is VDDIO_BANK35 @ 1.8V (500mV + 800mV + 400mV + 100mV):

1. Jumper on 3-4 -> adds 800mV to VDDIO_BANK35 above the default 500mV
2. Jumper on 5-6 -> adds 400mV to VDDIO_BANK35
3. Jumper on 9-10 -> adds 100mV to VDDIO_BANK35

Please note that by default VDDIO_BANK35 is supplied by VADJ Regulator. For using a dedicated VDDIO_BANK35, it is required to remove R343 and mount R344: check BORA Xpress Evaluation Kit schematics page 10. Then, check and/or properly configure JP27 for selecting the required VDDIO_BANK35

Bank 34 and VADJ VDDIO 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	Notes
2	VADJ_FB (22K)	selects 3.3V VADJ	-
4	VADJ_FB (30K9)	selects 2.5V VADJ	-
6	VADJ_FB (51K1)	selects 1.8V VADJ	-
8	VADJ_FB (68K)	selects 1.5V VADJ	-
10	VADJ_FB (100K)	selects 1.2V VADJ	-
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

The default configuration is:

1. Jumper on 5-6 -> supply VADJ with 1.8V