CW308 UFO Target

The CW308 UFO Board is a handy main-board for attacking all sorts of embedded targets. Released in 2016, it forms the basis for most of our upcoming target boards. It can be used stand-alone (with an oscilloscope) or with the ChipWhisperer-Capture hardware.

Overview

Victim Board Connectors

The "victim board" fits into three 20-pin female headers. They provide both electrical and mechanical connections for the board. There is optional mounting holes which can be used if additional mechanical support is required (especially if you need a locked-down victim for use with an EM probe).

The following shows the dimensions of the main connector:

The CW308 victim board has contacts on a 100 mil spacing, allowing you to use regular prototype boards. Click for full size.

Note the middle mounting hole is slightly offset to one direction! This was done to keep the mounting hole on a 100-mil grid spacing.

J7 (West, A)	Function	Direction	Notes
1	Spare		Not connected to main-board, can be used as spare I/O pin breakout.
2	GND
3	CLK-IN	CW308 --> Victim	Clock to victim.
4	GND
5	CLKOUT	CW308 <-- Victim
6	GND
7	GPIO1
8	GPIO2
9	GPIO3
10	GPIO4
11	nRST	CW308 --> Victim	100k pull-up to VREF.
12	SCK
13	MISO
14	MOSI
15	GND
16	GND
17	PDIC
18	PDID/CS
19	Spare
20	VREF	CW308 <-- Victim	Reference voltage for I/O. MUST be set to VCC-IO voltage (3.3V, etc) or I/O lines may not work.

J9 (South, B)	Function	Notes
1	GND
2	JTAG_TRST	Connects to 20-pin ARM JTAG header.
3	JTAG_TDI	Connects to 20-pin ARM JTAG header.
4	JTAG_TDO	Connects to 20-pin ARM JTAG header.
5	JTAG_TMS	Connects to 20-pin ARM JTAG header.
6	JTAG_TCK	Connects to 20-pin ARM JTAG header.
7	JTAG_VREF	Connects to 20-pin ARM JTAG header. All JTAG_ pins have 100k pull-up to this pin. Must set to appropriate value.
8	JTAG_nRST	Connects to 20-pin ARM JTAG header.
9	GND
10	GND
11	HDR1	J10, J12, J15: Pin 1
12	HDR2	J10, J12, J15: Pin 2
13	HDR3	J10, J12, J15: Pin 3
14	HDR4	J10, J12, J15: Pin 4
15	HDR5	J10, J12, J15: Pin 5
16	HDR6	J10, J12, J15: Pin 6
17	HDR7	J10, J12: Pin 7
18	HDR8	J10, J12: Pin 8
19	HDR9	J10: Pin 9
20	HDR10	J10: Pin 10

J11 (East, C)	Function	Direction	Notes
1	GND
2	SHUNTL		Low-Side Shunt Connection (connects to SMA)
3	SHUNTH		High-Side Shunt Connection (power input side)
4	GND
5	FILT_HP	CW308 --> Victim	High-Power filter output (same as FILT_LP on this hardware)
6	FILT_LP	CW308 --> Victim	Low-Power filter output (same as FILT_HP on this hardware)
7	GND
8	FILTIN	CW308 <-- Victim	Input to power supply filter.
9	GND
10	GND
11	1.2V	CW308 --> Victim	1.2V LDO Regulator output
12	1.8V	CW308 --> Victim	1.8V LDO Regulator output
13	2.5V	CW308 --> Victim	2.5V LDO Regulator output
14	3.3V	CW308 --> Victim	3.3V LDO Regulator output OR 3.3V from 20-pin connector
15	5.0V	CW308 --> Victim	5.0V from either DC-Power jack or 20-pin connector
16	GND
17	GND
18	LED1	CW308 <-- Victim	Active-high buffered LED driver. 100k pull-down.
19	LED2	CW308 <-- Victim	Active-high buffered LED driver. 100k pull-down.
20	LED3	CW308 <-- Victim	Active-high buffered LED driver. 100k pull-down.

Removing / Replacing Victim Boards

The target board is removed and replaced using the removal tool. This helps avoid bending pins:

The following shows the removal process:

Adding a board involves carefully aligning the board and pushing down:

The alignment should be carefully checked if resistance is found. You may need to adjust how the board is aligned, as you should be able to press down with minimal force.

The CW308 should be turned off when swapping victim boards.

I/O Connections

There are two main I/O connection points: the pin headers which duplicate the target board connections, and the 20-pin ChipWhisperer header.

The ChipWhisperer header pins (most of the pins on header J5) have diode protection to set a maximum voltage level. The maximum voltage is set by the voltage present on the middle pin of J4.

VREF Level Setting

The on-board 'VREF' network sets the reference voltage to allow usage with multiple I/O levels. Note there are no voltage translators on-board, instead you can use the [CW506 Advanced Breakout Board] to provide voltage translation. One of the pins on the 20-pin connector outputs the reference voltage (VREF), so the CW506 knows what voltage level to translate I/O signals to.

The on-board crystal oscillator is powered from the VREF network, ensuring the on-board oscillator is at an appropriate voltage reference.

The I/O pins connected to the 20-pin header have diode clamping, with the maximum level set by the VREF network. You must ensure jumper J4 sets a correct reference level. If using any of the official victim boards this is done by setting J4 to receive it's reference level from "J5-VREF" pin.

20-Pin Pinout

The pinout is as follows:

Number	Name	Dir	Description
1	+5V	I	+5V from ChipWhisperer-Capture.
2	GND	I	System GND.
3	+3.3V	I	+3.3V from ChipWhisperer-Capture.
4	HS1	O	High Speed output (normally clock in to ChipWhisperer-Capture).
5	nRST	I/O	Target RESET Pin (AVR Programmer).
6	HS2	I	High Speed input (normally clock or glitch out from ChipWhisperer-Capture).
7	MISO	I/O	SPI input: MISO (for SPI + AVR Programmer).
8	VTarget	O	Set I/O voltage reference level.
9	MOSI	I/O	SPI output: MOSI (for SPI + AVR Programmer).
10	TARG1	I/O	TargetIO Pin 1 - Usually UART TX or RX.
11	SCK	I/O	SPI output: SCK (for SPI + AVR Programmer).
12	GPIO2	I/O	TargetIO Pin 2 - Usually UART RX or TX.
13	PROG-PDIC	I/O	PDI Programming Clock (XMEGA Programmer), or CS pin (SPI).
14	GPIO3	I/O	TargetIO Pin 3 - Extra I/O.
15	PROG-PDID	I/O	PDI Programming Data (XMEGA Programmer).
16	GPIO4	I/O	TargetIO Pin 4 - Usually trigger output.
17	GND	O
18	+3.3V	O	+3.3V from ChipWhisperer-Capture.
19	GND	O
20	+5V	O	+5V from ChipWhisperer-Capture.

Clock Network

Crystal Driver

The CW308 contains a crystal oscillator driver. This allows you to use a standard crystal to drive either the victim board or the connected ChipWhisperer. This also allows the use of the CW308 stand-alone, as it's possible to generate almost any frequency by simply putting an appropriate crystal into the socket.

Clock Selection

The clock routing is selected using jumper J3. This allows the following use cases:

Routing crystal oscillator (X1) to victim CLKIN.
Routing crystal oscillator (X1) to ChipWhisperer HS-IN, then routing HS-OUT to victim CLKIN (for glitch insertion).
Routing CLKFB from victim to ChipWhisperer HS-IN.
Routing ChipWhisperer HS-OUT to victim CLKIN.

Power Distribution

The following shows the routing of power to the victim board:

The following summarizes the switch information:

Switch	Function	Location	Notes
S1	Switch 5.0V from DC-Power Jack On/Off	Lower Left	Selects if DC 5.0V from DC-Jack is "always on", or gets gated by 3.3V source from 20-pin connector ('auto'). If 'auto' mode selected and no 20-pin cable connected, this is equivalent to turning the main supply to the board on/off. Thus when using the board stand-alone S1 acts as a power switch for the board.
S3	Choose 5.0V source to connect to victim board.		Can be used to turn on/off 5.0V to victim board.
S3-S7	Selected fixed LDO input source.		Can be used to turn on/off certain LDOs.
S8	Select adjustable LDO input source.		Select 5.0V or 3.3V input (3.3V comes from ChipWhisperer).
S2	Choose 3.3V source to connect to victim board.		Select 3.3V from 20-pin ChipWhisperer cable, or local LDO.

External Power Sources

There are two main sources to supply power to the CW308:

DC-input power jack (2.1mm barrel jack, center positive, 5.0V)
ChipWhisperer 20-pin connector (5.0V and 3.3V).

Note you can use the DC-input power jack alongside the ChipWhisperer power supply. The CW308 can switch the DC-power on/off, allowing the ChipWhisperer to still control the target power.

If using the board stand-alone, you can use the 3.3V pin of the CW20 pin to turn on/off the board remotely. This pin can be used as a digital input, which will turn on/off the 5.0V power jack. Be sure to switch all regulators to use the 5.0V DC-Jack in this case to avoid having a load on the 3.3V pin.

On-Board LDOs

There are five LDOs on-board the CW308. While they are mostly rated for 800mA, the board does not have sufficient thermal dissipation to operate at these conditions.

Four of the LDOs have fixed voltage settings: 1.2V, 1.8V, 2.5V, and 3.3V. The fifth LDO is adjustable, and is especially useful if you need to either (a) overcome the voltage drop of a shunt, or (b) feed a power supply into a device to turn off an internal regulator.

Adjustable Voltage Example

Programmer Connections

There are several headers that can be used as programming headers for the victim board. These are J10, J12, an J15. They are routed to pins 10 to 20 (H1 to H10) on the victim board connector J9. These connectors function is defined by the specific victim board mounted.

In addition there is a 20-pin JTAG header. This uses the standard JTAG ARM pinout.

Jumper Summary

J3: Clock selection.

Selects clock routing on the board.

1	2	3	Meaning
	style="background: blue;" X	style="background: blue;" X	VREF Network set by VREF Pin from Victim Board (DEFAULT)
style="background: blue;" X	style="background: blue;" X		VREF Network set to 3.3V from ChipWhisperer 20-pin header. If using board stand-alone this option cannot be used.
			VREF voltage can be fed into center pin via a jumper wire.

J4: VREF selection.

Selects levels for the diode clamps, selects voltage set on ChipWhisperer 20-pin connector VREF pin, selects I/O level for crystal oscillator.

J14: Filter input selection.

Selects source of FILT_IN pin. This pin can either come from the victim board (where victim sets own voltage), or the VADJ network (where adjustable regulator is used).

The adjustable regulator is often required when overcoming the voltage drop in the shunt and/or filter.

Usage Example: Stand-Alone

The CW308 can be used stand-alone. This is accomplished by providing an external DC power supply, and using a SMA-BNC to connect the voltage measurement to an oscilloscope.

If using a simple-serial target (such as the XMEGA or AVR), you can connect a USB-Serial device to provide communication.