Connectors

This section describes the on-board Poseidon connectors.

PC/104 ISA Bus

Connectors CN6 and CN7 carry the ISA bus signals. Figure 1 shows the PC/104 A and B pin layout for CN6, and the C and D pin layout for CN7.

Figure 1: CN6 and CN7 Connectors

CN6 Connector Pinout				CN7 Connector Pinout
IOCHCHK-	A1	B1	GND	GND	D0	D0	GND
SD7	A2	B2	RESETDRV	SBHE-	D1	D1	MEMCS16--
SD6	A3	B3	+5V	LA23	D2	D2	IOCS16-
SD5	A4	B4	IRQ9	LA22	D3	D3	IRQ10
SD4	A5	B5	-5V	LA21	D4	D4	IRQ11
SD3	A6	B6	DRQ2	LA20	D5	D5	IRQ12
SD2	A7	B7	-12V	LA19	D6	D6	IRQ15
SD1	A8	B8	ENDXFR-	LA18	D7	D7	IRQ14
SD0	A9	B9	+12V	LA17	D8	D8	DACK0-
IOCHRDY	A10	B10	keyed	MEMR-	D9	D9	DRQ0
AEN	A11	B11	SMEMW-	MEMW-	D10	D10	DACK5-
SA19	A12	B12	SMEMR-	SD8	D11	D11	DRQ5
SA18	A13	B13	IOW-	SD9	D12	D12	DACK6-
SA17	A14	B14	IOR-	SD10	D13	D13	DRQ6
SA16	A15	B15	DACK3-	SD11	D14	D14	DACK7-
SA15	A16	B16	DRQ3	SD12	D15	D15	DRQ7
SA14	A17	B17	DACK1-	SD13	D16	D16	+5
SA13	A18	B18	DRQ1	SD14	D17	D17	MASTER-
SA12	A19	B19	REFRESH-	SD15	D18	D18	GND
SA11	A20	B20	SYSCLK	keyed	D19	D19	GND
SA10	A21	B21	IRQ7
SA9	A22	B22	IRQ6
SA8	A23	B23	IRQ5
SA7	A24	B24	IRQ4
SA6	A25	B25	IRQ3
SA5	A26	B26	DACK2-
SA4	A27	B27	TC
SA3	A28	B28	BALE
SA2	A29	B29	+5V
SA1	A30	B30	OSC
SA0	A31	B31	GND
GND	A32	B32	GND

PC/104-Plus PCI Bus

The PC/104-Plus bus is essentially identical to the PCI Bus except for the physical design. A single pin and socket connector is specified for the bus signals. A 120-pin header, J3, arranged as four 30-pin rows incorporates a full 32-bit, 33MHz PCI Bus. The additional pins on the PC/104-Plus connectors are used as ground or key pins. The female sockets on the top of the board enable stacking another PC/104-Plus board on top of the Poseidon board.

Figure 2: CN3 Connector

	A	B	C	D
1	GND/5.0V KEY	Reserved	+5V	AD00
2	VI/O	AD02	AD01	+5V
3	AD05	GND	AD04	AD03
4	C/BE0*	AD07	GND	AD06
5	GND	AD09	AD08	GND
6	AD11	VI/O	AD10	M66EN
7	AD14	AD13	GND	AD12
8	+3.3V	C/BE1*	AD15	+3.3V
9	SERR*	GND	Reserved	PAR
10	GND	PERR*	+3.3V	Reserved
11	STOP*	+3.3V	LOCK*	GND
12	+3.3V	TRDY*	GND	DESEL*
13	FRAME*	GND	IRDY*	+3.3V
14	GND	AD16	+3.3V	C/BE2*
15	AD18	+3.3V	AD17	GND
16	AD21	AD20	GND	AD19
17	+3.3V	AD23	AD22	+3.3V
18	IDSEL0	GND	IDSEL1	IDSEL2
19	AD24	C/BE3*	VI/O	IDSEL3
20	GND	AD26	AD25	GND
21	AD29	+5V	AD28	AD27
22	+5V	AD30	GND	AD31
23	REQ0*	GND	REQ1*	VI/O
24	GND	REQ2*	+5V	GNT0*
25	GNT1*	VI/O	GNT2*	GND
26	+5V	CLK0	GND	CLK1
27	CLK2	+5V	CLK3	GND
28	GND	INTD*	+5V	RST*
29	+12V	INTA*	INTB*	INTC*
30	-12V	REQ3*	GNT3*	GND/3.3V KEY

On the Poseidon, all of the PCI circuitry is driven with 3.3V circuitry and is 5V tolerant. The main board can support either 3.3V or 5V-only cards. For this reason, the connector is not keyed (to prevent certain types of cards from being inserted).

PS2 Mouse and Keyboard connector

Connector CN19 is a 2x4-pin header used to connect a mouse or keyboard.

+5Vin	1	2	-
Keyboard data	3	4	Mouse data
Keyboard clock	5	6	Mouse clock
Ground	7	8	-

Signal	Definition
+5Vin	keyboard PS/2 pin 4
Keyboard data	keyboard PS/2 pin 1
Mouse data	mouse PS/2 pin 1
Keyboard clock	keyboard PS/2 pin 5
Mouse clock	mouse PS/2 pin 5
Ground	PS/2 pin 3

Utility Connector

Connector CN18 is a 2/4-pin header for access to the standard button/LED connections.

Speaker	1	2	PW LED
ATX power button	3	4	-
Ground	5	6	Ground
Reset key	7	8	-

The following table describes the CN18 connector pinouts.

Signal	Definition
Speaker	The signal on the Speaker pin is referenced to +5V out. Connect a speaker between this pin and +5V out.
PW LED	Switched power output to connect a panel power LED. No series resistor needed.
ATX power button	The ATX power button should be tied to ground whenever the “Power Button” is used. The “Power Button” has different functionality, depending on the current system mode and software operation. In general, the following guidelines apply. If the board is powered down, toggling (i.e., tie to ground briefly, then release) this button turns the system on, causing all non-standby voltages to become active. NOTE: depending on the default configuration, the system usually powers-up immediately as power is applied. If the system is currently powered up and active, toggling (i.e., tie to ground briefly, then release) this button causes a system power-down event to be initiated. Typically, this powers-down the monitor, hard drive, and any other non-essential functions. The system must be operating and the software executing normally for this function. Under Windows and some other OSs, this power-down event may cause the system to shut down. Typically, this is software-configurable via an option setting for the given OS. If the system is currently powered-up and active, holding this button for four seconds causes a forced system shutdown. This is a hardware power-down, which can be detrimental to many OSs due to the fact that they are not given adequate time to initiate shut-down sequencing. This operation should only be used in critical circumstances, such as when the system itself is locked due to system instability or a software crash. After powering the system down in this manner, the system remains powered down until the power button is toggled (tied to ground again and released). When ATX is enabled, a momentary contact between this pin and Ground causes the CPU to turn on and a contact of four seconds or longer generates a power shutdown. ATX power control is enabled using a jumper on jumper block JP7.
Ground	Ground
Reset key	Connection between Reset key and ground generate a reset condition. The board remains in a reset state (with non-standby power rails disabled) until Reset key is removed from ground.

Data Acquisition (Digital I/O) Connector

Poseidon includes a 2x17-pin header, CN12, for all digital data acquisition I/O.

DIO A7	1	2	DIO A6
DIO A5	3	4	DIO A4
DIO A3	5	6	DIO A2
DIO A1	7	8	DIO A0
DIO B7	9	10	DIO B6
DIO B5	11	12	DIO B4
DIO B3	13	14	DIO B2
DIO B1	15	16	DIO B0
DIO C7	17	18	DIO C6
DIO C5	19	20	DIO C4
DIO C3	21	22	DIO C2
DIO C1	23	24	DIO C0
DIN0/CLK0	25	26	DIN1/GATE0
DOUT0/CTROUT0	27	28	DOUT2/CTROUT2
AD_RCB	29	30	DOUT1/SHOUT
DIN3/EXTCLK	31	32	DIN2/EXTGATE
+5V out	33	34	Ground

Signal	Definition
DIO A7-A0	Digital I/O port A; programmable direction
DIO B7-B0	Digital I/O port B; programmable direction
DIO C7-C0	Digital I/O port C; programmable direction
DIN0-1	Digital input port with counter/timer and external trigger functions
DOUT0-2	Digital output port with counter/timer functions
CLK0	Input source to Ctr 0
GATE0	Pin to control gating of Ctr 0
CROUT0	Counter 0 output
CROUT2	Counter 2 output
AD_RCB	A/D convert signal output; can be used to synchronize multiple boards
SHOUT	-
EXTCLK	External A/D trigger input; Also used for digital interrupt (DINT) input
EXTGATE	Pin to control gating of Ctrs 1& 2 for A/D timing
+5V out	Connected to switched +5V supply (Output only! Do not connect to external supply)
Ground	Digital ground (0V - reference); used for digital circuitry only

Data Acquisition (Analog I/O) Connector

Connector CN13 is a 2x20-pin header used for analog I/O data acquisition.

Single-ended				Differential
Vin 0	1	2	Vin 16	Vin 0 +	1	2	Vin 0 -
Vin 1	3	4	Vin 17	Vin 1 +	3	4	Vin 1 -
Vin 2	5	6	Vin 18	Vin 2 +	5	6	Vin 2 -
Vin 3	7	8	Vin 19	Vin 3 +	7	8	Vin 3 -
Vin 4	9	10	Vin 20	Vin 4 +	9	10	Vin 4 -
Vin 5	11	12	Vin 21	Vin 5 +	11	12	Vin 5 -
Vin 6	13	14	Vin 22	Vin 6 +	13	14	Vin 6 -
Vin 7	15	16	Vin 23	Vin 7 +	15	16	Vin 7 -
Vin 8	17	18	Vin 24	Vin 8 +	17	18	Vin 8 -
Vin 9	19	20	Vin 25	Vin 9 +	19	20	Vin 9 -
Vin 10	21	22	Vin 26	Vin 10 +	21	22	Vin 10 -
Vin 11	23	24	Vin 27	Vin 11 +	23	24	Vin 11 -
Vin 12	25	26	Vin 28	Vin 12 +	25	26	Vin 12 -
Vin 13	27	28	Vin 29	Vin 13 +	27	28	Vin 13 -
Vin 14	29	30	Vin 30	Vin 14 +	29	30	Vin 14 -
Vin 15	31	32	Vin 31	Vin 15 +	31	32	Vin 15 -
Output ground	33	34	Vout 0	Output ground	33	34	Vout 0
Vout 1	35	36	Vout 2	Vout 1	35	36	Vout 2
Vout 3	37	38	Analog ground	Vout 3	37	38	Analog ground
DIN3/EXTCLK	39	40	Digital ground	DIN3/EXTCLK	39	40	Digital ground

Signal	Definition
Vout3-0	Analog output channels 3 – 0
Analog Ground	0V analog reference
Vin 31 ~ Vin 0	Analog input channels 31 – 0 in single-ended mode
Vin 15 + ~ Vin 0 +	High side of input channels 15 – 0 in differential mode
Vin 15 - ~ Vin 0 -	Low side of input channels 15 – 0 in differential mode
Digital ground	0V digital reference
DIN3	Digital input port with counter/timer and external trigger functions
EXTCLK	External A/D trigger input; Also used for digital interrupt (DINT) input

NOTE: The reference grounds are NOT decoupled from the power grounds – they are indirectly connected to the power supply input (and other on-board ground/0V references). Do not assume that these grounds are floating. Do not apply a high-voltage input (relative to the power input ground) to these ground signals or to any other board I/O pin.

Ethernet Connector

10/100/1000 BaseT (Gigabit) Ethernet connectivity is provided by connectors CN17. Connector CN17 is a 2x5-pin header.

Common	1	2	-
DA+	3	4	DA-
DB+	5	6	DB-
DC+	7	8	DC-
DD+	9	10	DD-

Signal	Definition
DA+/-	Data A; bi-directional pair A+/A-
DB+/-	Data B; bi-directional pair B+/B-
DC+/-	Data C; bi-directional pair C+/C-
DD+/-	Data D; bi-directional pair D+/D-

Audio I/O Connector

Connector CN15 is a 2x5-pin header that provides audio connectivity.

Left headphone/Line out	1	2	Right headphone/Line out
Audio ground	3	4	Left line input
Right line input	5	6	Audio ground
Microphone input	7	8	Power reference
-	9	10	Audio ground

Signal	Definition
Headphone/Line Out	Line Level output, capable of driving headphones, which is referred to as “Headphone Out” in most sound documentation.
Line Input	Line-Level input, which is referred to as “Line In” in most sound documentation.
Microphone Input	Microphone-level mono input; phantom power provided via pin 9.
Power reference	Microphone power reference
Audio ground	Ground

The Poseidon sound chip is AC97-compatible. The “Line Out” is powered and used for the amplified Speaker Connector output, J13, described below. The line-level output listed above is listed as either “Headphone Out” or “Line Out 2” in most of the software and documentation for this sound interface.

Speaker Connector

Connector CN11 is a 2x4-pin header used to connect speakers.

Speaker left high (+)	1	2	Speaker left low (-)
Speaker right high (+)	3	4	Speaker right low (-)
Volume, high	5	6	Volume, mid
Volume, low	7	8	-

Signal	Definition
Speaker LEFT +/-	Speaker Connection Pair for LEFT speaker (4-Ohm Speaker)
Speaker RIGHT +/-	Speaker Connection Pair for RIGHT speaker (4-Ohm Speaker)
Mono Output	Line-Level mono output (for reference)
Volume – LOW, MID, HIGH	These are volume controls for the attached speakers

The volume control is capable of 32 discrete levels, ranging from a 20dB maximum gain to -85dB (Muted). The main volume control is the “MID” line, which may be tied to the center tap of a potentiometer with “HIGH” on one side and “LOW” on the other to give a full range of power control.

Shorting “MID” to “LOW” mutes the speaker audio.

Shorting “MID” to “HIGH” provides maximum gain.

Default (no connection) provides 10dB of gain.

The maximum output power is specified to provide up to two Watts into a 4-Ohm speaker load. Note that this output power is drawn from the on-board 5V supply.

The speakers are driven using a Bridged-Tied Load (BTL) amplifier configuration. This is a differential speaker connection. As such, each speaker should be wired directly to the appropriate pair of connections for that speaker.

Do not connect the speaker low sides (-) to ground

Do not short the speaker low connections together.

External Auxiliary Power Connector (Output)

Connector CN10 provides switched power for use with external drives. If ATX is enabled, the power is switched ON and OFF with the ATX input switch. If ATX is not enabled, the power is switched ON and OFF in conjunction with the external power.

Figure 3: CN10 Connector

1	+5v (switched)
2	Ground
3	Ground
4	+12v (switched)

Signal	Definition
+5v	This is provided by the on-board power supply, derived from the input power. It is switched off when the board is powered down.
+12v	This is provided by the 12V input pin on the main power connector. It is switched off when the board is powered down.
Ground	These are 0V ground references for the power output voltage rails, above.

Diamond Systems Corporation cable no. 698006 mates with J15. This cable provides a standard full-size power connector for a hard drive or CD-ROM drive and a standard miniature power connector for a floppy drive.

IDE Connector

Connector CN2 is a 2x22-pin header used for the IDE connection.

Reset -	1	2	Ground
D7	3	4	D8
D6	5	6	D9
D5	7	8	D10
D4	9	10	D11
D3	11	12	D12
D2	13	14	D13
D1	15	16	D14
D0	17	18	D15
Ground	19	20	Key (not used)
DRQ	21	22	Ground
IDEIOW-	23	24	Ground
IDEIOR-	25	26	Ground
IORDY	27	28	Ground
DACK-	29	30	Ground
IRQ15	31	32	Pulled low for 16-bit operation
A1	33	34	Not used
A0	35	36	A2
CS1-	37	38	CS3-
LED-	39	40	Ground
+5v	41	42	+5v
Ground	43	44	Not used

Serial Port I/O Connector

Connector CN20 is a 2x20-pin header that provides access to the four on-board serial ports. The PORT1 and PORT2 serial ports are always configured for RS-232. The PORT3 and PORT4 serial ports are independently, software configurable as either RS-232, RS-485 or RS-422. All four serial ports are independently enabled.

Port No.	Pin Assignment
PORT1	Pins 1 - 10
PORT2	Pins 11 - 20
PORT3	Pins 21 - 30
PORT4	Pins 31 - 40

The following tables list the signals for each mode of operation, including the DE-9 pin numbers associated with the signals.

RS-232 Pin Assignment

COM1: DCD1	1	2	DSR1
RXD1	3	4	RTS1
TXD1	5	6	CTS1
DTR1	7	8	RI1
GND	9	10	N/C
COM2: DCD2	11	12	DSR2
RXD2	13	14	RTS2
TXD2	15	16	CTS2
DTR2	17	18	RI2
GND	19	20	-
COM3: DCD3	21	22	DSR3
RXD3	23	24	RTS3
TXD3	25	26	CTS3
DTR3	27	28	RI3
GND	29	30	N/C
COM4: DCD4	31	32	DSR4
RXD4	33	34	RTS4
TXD4	35	36	CTS4
DTR4	37	38	RI4
GND	39	40	-

Signal	Definition	DE-9 Pin	Direction
DCDn	Data Carrier Detect	pin 1	Input
DSRn	Data Set Ready	pin 6	Input
RXDn	Receive Data	pin 2	Input
RTSn	Request to Send	pin 7	Output
TXDn	Transmit Data	pin 3	Output
CTSn	Clear to Send	pin 8	Input
DTRn	Data Terminal Ready	pin 4	Output
RIn	Ring Indicator	pin 9	Input
GND	Ground	-	-

RS-485 Pin Assignment

Only CN20 connector pins 21 through 40, PORT3 and PORT4, are used for RS-485.

COM3: NC	21	22	NC
TXD/RXD+3	23	24	TXD/RXD-3
GND	25	26	NC
NC	27	28	NC
GND	29	30	NC
COM4: NC	31	32	NC
TXD/RXD+4	33	34	TXD/RXD-4
GND	35	36	NC
NC	37	38	NC
GND	39	40	NC

Signal	Definition	DE-9 Pin	Direction
TXD/RXD+n	Differential Transceiver Data (HIGH)	pin 2	bi-directional
TXD/RXD-n	Differential Transceiver Data (LOW)	pin 7	bi-directional
GND	Ground	-	-
NC	(not connected)	-	-

RS-422 Pin Assignment

Only CN20 connector pins 21 through 40, PORT3 and PORT4, are used for RS-422.

COM3: NC	21	22	NC
TXD+1	23	24	TXD-1
GND	25	26	RXD-1
RXD+1	27	28	NC
GND	29	30	NC
COM4: NC	31	32	NC
TXD+2	33	34	TXD-2
GND	35	36	RXD-2
RXD+2	37	38	NC
GND	39	40	NC

Signal	Definition	DE-9 Pin	Direction
TXD+n/TXD-n	Differential transmit data	-	Output
RXD+n/RXD-n	Differential receive data	-	Input
GND	Ground	-	-
NC	(not connected)	-	-

External Battery Connector

Connector CN8 is used to connect an external battery. The battery voltage for this input should be 3-3.5V. The current draw averages under 4µA at 3V.

Figure 4: CN8 Connector

1	Battery input (+)
2	Ground

In addition to the external battery connected to CN8, the on-board battery and an additional external battery input on Utility Connector CN18 are other possible sources for maintaining the Real-Time Clock and the CMOS settings (BIOS settings for various system configurations). The battery that has the highest voltage will see the majority of the current draw, which is minimal. Note that there must be a battery voltage input for the default power-up mode.

LCD Panel (LVDS Interface) Connector

Connector CN1 provides access to the internal LVDS LCD display drivers. Note that the LCD also requires the backlight to be connected (CN4, below) to function correctly.

Figure 5: LCD Panel Connector

LCD1 data 0-	1	2	LCD2 data 0-
LCD1 data 0+	3	4	LCD2 data 0+
Ground	5	6	Ground
LCD1 data 1-	7	8	LCD2 data 1-
LCD1 data 1+	9	10	LCD2 data 1+
Ground	11	12	Ground
LCD1 data 2-	13	14	LCD2 data 2-
LCD1 data 2+	15	16	LCD2 data 2+
Ground	17	18	Ground
LCD1 clock-	19	20	LCD2 clock-
LCD1 clock+	21	22	LCD2 clock+
Ground	23	24	Ground
LCD1 data 3-	25	26	LCD2 data 3-
LCD1 data 3+	27	28	LCD2 data 3+
VDD (LCD display)	29	30	VDD (LCD display)

Signal	Definition
LCD1 Data 3-0 +/-	Primary Data Channel, bits 3-0 (LVDS Differential signaling)
LCD1 Clock +/-	Primary Data Channel, Clock (LVDS Differential signaling)
LCD2 Data 3-0 +/-	Secondary Data Channel, bits 3-0 (LVDS Differential signaling)
LCD2 Clock +/-	Secondary Data Channel, Clock (LVDS Differential signaling)
VDD	+3.3V Switched Power Supply for LCD display (only powered up when LCD display is active)
Ground	Power Ground, 0V

VGA Connector

Connector CN16 is a 2x5-pin header for connecting a VGA monitor.

Red	1	2	Ground
Green	3	4	-
Blue	5	6	Ground
HSYNC	7	8	DDC data
VSYNC	9	10	DDC clock

Signal	Definition
Red	RED signal (positive, 0.7Vpp into 75 Ohm load)
R-Ground	Ground return for RED signal
Green	GREEN signal (positive, 0.7Vpp into 75 Ohm load)
G-Ground	Ground return for GREEN signal
Blue	BLUE signal (positive, 0.7Vpp into 75 Ohm load)
B-Ground	Ground return for BLUE signal
DDCclock/data	Digital serial I/O signals used for monitor detection (DDC1 specification)
HSYNC	Horizontal sync
VSYNC	Vertical sync

Note: While the DDC serial detection pins are present, a 5V power supply is not provided (the old “Monitor ID” pins are also not used).

LCD Backlight Connector

Connector CN4 provides the backlight power and control for the optional LCD panel. See the description for connector CN1, above, for details on the LCD data interface.

Figure 6: CN4 Connector

1	+12v
2	Control
3	Ground

Signal	Definition
Control	Output signal (from Poseidon) to allow power-down of backlight
+12V	Power supply for LCD Backlight assembly
Ground	Ground for LCD Backlight assembly

The control signal is used to allow the system to power-down the backlight when the system enables monitor-power-down during power management control.

The +12V supply is removed when the system is powered down.

Power Input Connector

The standard Poseidon input power is supplied through the CN9 connector from an external mid-range supply.

Figure 7: CN9 Connector

PS_ON	1	5	+5V standby
Ground	2	6	+5V in
Ground	3	7	+5V in
+12V in	4	8	Ground

Signal	Definition
+5V in	+5V main input power.
Ground	0-V (ground) power return path.
+12V in	Power supply for in-board 12V devices, including hard drives, auxiliary power, PC/104 power, and LCD backlight. Range should be 11.9V to 13.5V measured at this connector.
+5V standby	+5V standby power; powers board when in standby mode.
PS_ON	Power Supply ON. Feedback pin for external ATX supply, when needed; pulled low when on-board power is inactive.

Poseidon in the standard, mid-range power input configuration supports a voltage range from +4.75V to +5.25V, with some restrictions.

The “+12V” power supply input is intended for all on-board and board-controlled 12V power supplies, including the PC/104-Plus 12V supplies, the external hard drive power supply (through connector J15, described above), and the LCD backlight. If these devices are not used, the “+12V” input may be left unconnected.

Make certain that your power supply has enough current capacity to drive your system. The Poseidon requires 12 to 20 Watts or more, depending on which external devices are connected to the board. This could require over 4A on the “+Vin” line at minimum voltage inputs. In particular, many disk drives need extra current during startup. If your system fails to boot properly or if disk accesses do not work correctly, the first thing to check is the power supply voltage level. Many boot-up problems are caused simply by insufficient voltage due to excess current draw on the “+Vin” supply during initialization.

Multiple +5V and ground pins are provided for extra current carrying capacity, if needed. Each pin is rated at 3A max (15W). For the Poseidon CPU with a moderate I/O device complement (basic hard drive, key board, mouse, USB devices, and a network PC/104-Plus card, for example).

ATX control enables the +5V and +12V power to be switched ON and OFF with an external momentary switch. A short press on the switch turns ON power, and holding the switch on for four seconds or longer turns OFF power (See the Utility Header description for connector CN18, above).

USB 2.0 Connectors

Connector CN21 is a 2x10 pin headers for connecting USB 0/1 and USB 2/3, each providing USB 2.0 480Mbps maximum transfer rates.

-	1	2	Shield
Shield	3	4	Shield
USB3 data+	5	6	USB2 data+
USB3 data-	7	8	USB2 data-
USB2/3 power	9	10	USB2/3 power
-	11	12	Shield
Shield	13	14	Shield
USB1 data+	15	16	USB0 data+
USB1 data-	17	18	USB0 data-
USB0/1 power	19	20	USB0/1 power

Signal	Definition
Shield	ground
USB0-3 power-	+5V power for USB ports 0-3
USB0-3 data+	data + for USB ports 0-3
USB0-3 data-	data - for USB ports 0-3

Serial ATA Connector

Connector CN5 is the serial ATA connector.

Figure 8: Serial ATA Connector

1	Ground
2	TX+
3	TX-
4	Ground
5	RX-
6	RX+
7	Ground
8	Ground
9	Ground

Signal	Definition
TX+/TX-	Differential outputs to PHY
RX+/RX-	Differential inputs from PHY
Ground	Ground

I/O Panel Power

Connector CN14 is a 2x10-pin header providing I/O panel power.

+5V in	1	2	+5V in
+5V in	3	4	+5V in
+5V in	5	6	+5V in
+5V in	7	8	+5V in
Ground	9	10	Ground
Ground	11	12	Ground
Ground	13	14	Ground
Ground	15	16	Ground
+12V in	17	18	+12V in
+5V standby	19	20	PS_ON

Signal	Definition
+5V in	+5V input
+12V in	+12V input
+5V standby	+5V standby power; powers board when in standby mode.
PS_ON	Power Supply ON. Feedback pin for external ATX supply, when needed; pulled low when on-board power is inactive.
Ground	Ground

Note: Optionally, a PC/104 power supply may be used to power the board through the PC/104 bus.

Standard JTAG Configuration Interface (Factory Use)

Connector J1 is the JTAG configuration interface for factory use and firmware upgrade.

1	+3.3V
2	GND
3	CTCK
4	FTDO
5	CTDI
6	CTMS

Signal	Definition
+3.3V	Power
GND	Ground
CTCK	Test clock input
FTDO	Test data output
CTDI	Test data input
CTMS	Test mode select

Reference Voltage Test Point (Factory Use)

Connector J2 is the reference voltage test point for use during factory calibration.

1	+Vref
2	GND

Signal	Definition
+Vref	Reference voltage
GND	Ground