Simtec Electronics

BBD20EUROU Connector/Jumper/Pinout list



©2008 Simtec Electronics


This document shows the pinouts for the BBD20EUROU. Several special function pins exist which may be changed to simple GPIO if the special function is not required. Some pins have more than one special function which should be taken into account.

BBD20EUROU connector layout SD/MMC Headphones Microphone Davicom Ethernet Audio expansion Signal ground Amplified speaker URT panel interface Module supply select 3.3V select JTAG D20 socket


PL40 - URT panel interface

1VD<0>D20 video bit 0
2N/CNot connected
3N/CNot connected
4VLEDLED backlight voltage 5V
7VLCDLCD display electronics supply 3.3V
8N/CNot connected
9DED20 video DE
10ADC<6>Touchscreen X Left
11ADC<5>Touchscreen Y Up
12TOUT<1>D20 first TOUT
13VD<7>D20 video bit 7
14VD<6>D20 video bit 6
15VD<5>D20 video bit 5
16GNDSignal ground
17VD<4>D20 video bit 4
18VD<3>D20 video bit 3
19VD<7>D20 video bit 7
20GNDSignal ground
21VD<15>D20 video bit 15
22VD<14>D20 video bit 14
23VD<13>D20 video bit 13
24GNDSignal ground
25VD<12>D20 video bit 12
26VD<11>D20 video bit 11
27VD<10>D20 video bit 10
28GNDSignal ground
29VD<23>D20 video bit 23
30VD<22>D20 video bit 22
31VD<21>D20 video bit 21
32GNDSignal ground
33VD<20>D20 video bit 20
34VD<19>D20 video bit 19
35VD<23>D20 video bit 23
36ADC<7>Touchscreen X Right
37ADC<4>Touchscreen Y Down
38VCLKD20 video clock
39GNDSignal ground
40VD<1>D20 video bit 1

General IO

PL39 - SD/MMC socket

1DATA<1>Data bit 1
2DATA<0>Data bit 0
3CLOCKData clock
5GNDSignal ground
7CMDCommand select
8DATA<3>Data bit 3
9DATA<2>Data bit 2

PL43 - Radio

1TXRadio module transmit (D20 serial RX<1> )
2RXRadio module recieve (D20 serial TX<1> )
3nPGMRadio module MISO (D20 EINT<15>)
43.3V3.3V supply
5WPRadio module WP
6GNDSignal ground
7nRESETRadio module reset (D20 EINT<16>)


PL32 - Davicom Ethernet port

1DMTX+Transmit positive
2DMTX-Transmit negative
3DMRX+Receive positive
4N/CNo connection
5N/CNo connection
6DMRX-Receive Negative
7N/CNo connection
8N/CNo connection


PL41 - Amplified speaker header

1PO+Speaker positive
2PO-Speaker negative

PL28 - Audio Expansion

1MIC INMicrophone input
2GNDMicrophone ground
3Line in leftLeft line in
4GNDLine in ground
5Line in rightRight line in
6GNDLine in ground
7Line out LeftLeft line out
8GNDLine out ground
9Line out RightRight line out
10GNDLine out ground
11Headphone left outAmplified headphone left channel
12GNDHeadphone ground
13Headphone out rightAmplified headphone right channel
14GNDHeadphone ground
15Supply5V supply
16GNDSupply ground

PL30 - MIC in

1GNDMicrophone ground
2N/CNot connected
3N/CNot connected
4N/CNot connected
5 MIC_IN Input for a condensing microphone.

PL29 - Headphones out

1GNDHeadphone ground
2HP_RIGHTHeadphone right
3SPKR passthroughRight speaker pass through
4SPKR passthroughLeft speaker pass through
5HP_LEFTHeadphone left


PL17 - Power connector

This connector is a 2.1mm barrel jack, the center is positive supply 4A@5V absolute maximum.

1GNDSupply ground outer ring
2GNDSupply Ground
3POWER_IN5V Supply on center tip

PL18 - Chassis ground spade connector

1GNDChassis ground point

PL9 - Signal Ground

1GNDSignal ground
2GNDSignal ground
3GNDSignal ground

PL3 - 5V select

This link selects the 5V source of the board.

1VUSBUSB device port 5V input
2PSELSelected 5V supply into system
3PWRJACKInput from PL17

PL4 - 3.3V select

This link selects the boards 3.3V supply from between the D20 module DC-DC convertor and an onboard linear regulator.

1D203VD20 module 3V output.
23.3VBoard 3.3V rail.
3REG3V33.3V from regulator.

PL38 - Module supply select

This link selects between the 3.3V and 5V supply as input to the D20 module. If PL4 has the D203V supply selected this link cannot have the 3.3V supply selected.

15V5V supply
2D20SUPD20 supply
33.3V3.3V supply



13.3V3.3 Volt supply
2nTRSTInverted tap reset
3TDITap data in
5TCKTap clock
6RCLKReturned clock
7TDOTap data out
8nSRSTInverted system reset
9GNDSignal ground
10NCNo connection


PL19 - Serial Port

1N/CNo connection
2RX<0>D20 port 0 Receive
3TX<0>D20 port 0 Transmit
4N/CNo connection
6N/Cno connction
7RTS<0>D20 port 0 Request to send
8CTS<0>D20 port 0 Clear to send
9N/CNo connection

PL42 - Serial SIL header

13.3V3.3V supply
2TX<1>D20 port 1 Transmit
3RX<1>D20 port 1 Receive
4TX<2>D20 port 2 Transmit
5RX<2>D20 port 2 Receive
6GNDSignal ground

The port 1 signals are also present as part of the PL43 radio module programming header.


The D20 module provides two USB ports. The first port (port 1) is a host controller only port and is wired to the lower socket on the dual A connector PL23. The second port (port2) may be configured as either a host or device port. The port is link selectable (PL1 and PL2) between the upper socket on PL23 and the type B device port connector PL24

PL1 - USB socket select

1HD2NPL23 upper socket.
2DN<1>D20 USB port 2 negative
3DPNPL24 device socket.

PL2 - USB socket select

1HD2PPL23 upper socket.
2DP<1>D20 USB port 2 positive
3DPPPL24 device socket.

PL23 - USB host ports

L1SupplyLower socket +5V supply
L2D-Lower socket data negative
L3D+Lower socket data positive
L4GNDLower socket Ground
U1SupplyUpper socket +5V supply
U2D-Upper socket data negative
U3D+Upper socket data positive
U4GNDUpper socket Ground

PL24 - USB device port

1Supply+5V supply
2D-data negative
3D+data positive


PL34 - D20 connector

1VOUTOutput supply from module
3nFREInverted read enable
4ALENAND address latch enable
5nFWENAND Inverted write enable
6CLENAND Command latch enable
7nFCE<2>Third NAND chip select
8R/nBNAND ready/not busy
9D<0>Data bus bit 0
10D<16>Data bus bit 16
11D<1>Data bus bit 1
12D<17>Data bus bit 17
13D<2>Data bus bit 2
14D<18>Data bus bit 18
15D<3>Data bus bit 3
16D<19>Data bus bit 19
17D<4>Data bus bit 4
18D<20>Data bus bit 20
19D<5>Data bus bit 5
20D<21>Data bus bit 21
21D<6>Data bus bit 6
22D<22>Data bus bit 22
23D<7>Data bus bit 7
24D<23>Data bus bit 23
25D<8>Data bus bit 8
26D<24>Data bus bit 24
27D<9>Data bus bit 9
28D<25>Data bus bit 25
29D<10>Data bus bit 10
30D<26>Data bus bit 26
31D<11>Data bus bit 11
32D<27>Data bus bit 27
33D<12>Data bus bit 12
34D<28>Data bus bit 28
35D<13>Data bus bit 13
36D<29>Data bus bit 29
37D<14>Data bus bit 14
38D<30>Data bus bit 30
39D<15>Data bus bit 15
40D<31>Data bus bit 31
43nWBE<0>First inverted write byte enable
44BUF_ENBuffer enable
45nWBE<1>Second inverted write byte enable
46BUF_DIRBuffer direction
47nWBE<2>Third inverted write byte enable
48PWN_ENPower good output
49nWBE<3>Forth inverted write byte enable
50nRESETInverted reset output
51nWAITInverted I/O wait signal
52nCS<1>First inverted chip select
53nIOCS16Inverted sixteen bit access select
54nCS<2>Second inverted chip select
55nRDInverted read select
56nCS<3>Third inverted chip select
57nWRInverted write select
58nCS<4>Fourth inverted chip select
60nCS<5>Fifth inverted chip select
61A<0>Address bus bit 0
62A<15>Address bus bit 15
63A<1>Address bus bit 1
64A<16>Address bus bit 16
65A<2>Address bus bit 2
66A<17>Address bus bit 17
67A<3>Address bus bit 3
68A<18>Address bus bit 18
69A<4>Address bus bit 4
70A<19>Address bus bit 19
71A<5>Address bus bit 5
72A<20>Address bus bit 20
73A<6>Address bus bit 6
74A<21>Address bus bit 21
75A<7>Address bus bit 7
76A<22>Address bus bit 22
77A<8>Address bus bit 8
78A<23>Address bus bit 23
79A<9>Address bus bit 9
80A<24>Address bus bit 24
81A<10>Address bus bit 10
82A<25>Address bus bit 25
83A<11>Address bus bit 11
84A<26>Address bus bit 26
85A<12>Address bus bit 12
86TCLK0Timer 0 output
87A<13>Address bus bit 13
88TOUT<0>First PWM output
89A<14>Address bus bit 14
90TOUT<1>Second PWM output
92TOUT<2>Third PWM output
93DACK<0>First DMA acknowledge
94TOUT<3>Fourth PWM output
95DREQ<0>First DMA request
96DACK<1>Second DMA acknowledge
97I2S_LRCKI2S left right select
98DREQ<1>Second DMA request
99I2S_CLKI2S clock
100EINT<0>External interrupt 0
101I2S_CDCLKI2S command/data select
102EINT<1>External interrupt 1
103I2S_SDII2S serial data in
104EINT<2>External interrupt 2
105I2S_SDOI2S serial data out
106EINT<3> External interrupt 3
107SDCLKSD card clock
108EINT<4> External interrupt 4
109SDCMDSD card command
110EINT<5> External interrupt 5
111SDDATA<0>SD card first data line
112EINT<6>External interrupt 6
113SDDATA<1>SD card second data line
114EINT<7> External interrupt 7
115SDDATA<2>SD card third data line
116EINT<8> External interrupt 8
117SDDATA<3>SD card fourth data line
118EINT<9> External interrupt 9
119SPIMISOSPI bus master in slave out
120EINT<10> External interrupt 10
121SPIMOSISPI bus master out slave in
122EINT<11>External interrupt 11
123SPICLKSPI bus clock
124EINT<12>External interrupt 12
125SCLI2C bus clock
126EINT<13> External interrupt 13
127SDAI2C bus data
128EINT<14>External interrupt 14
130EINT<15> External interrupt 15
131LENDLine end
132EINT<16> External interrupt 16
133VCLKVideo clock
134RTS<1>Second serial port request to send
135HSHorizontal sync
136CTS<1>Second serial port clear to send
137VSVertical sync
138EINT<19>External interrupt 19
139DE/VMVideo data enable
140CTS<0>First serial port Clear To Send
141VD<0>Video bus bit 0
142RTS<0>First serial port Request To Send
143VD<1>Video bus bit 1
144TX<0>First serial port transmit
145VD<2>Video bus bit 2
146RX<0>First serial port recive
147VD<3>Video bus bit 3
148TX<1>Second serial port transmit
149VD<4>Video bus bit 4
150RX<1>Second serial port recive
151VD<5>Video bus bit 5
152TX<2>Third serial port transmit
153VD<6>Video bus bit 6
154RX<1>Third serial port recive
155VD<7>Video bus bit 7
156VOUTOutput supply from module
157VD<8>Video bus bit 8
158GNDAnalog Ground
159VD<9>Video bus bit 9
160ADC<0>Analog input 0
161VD<10>Video bus bit 10
162ADC<1>Analog input 1
163VD<11>Video bus bit 11
164ADC<2>Analog input 2
165VD<12>Video bus bit 12
166ADC<3>Analog input 3
167VD<13>Video bus bit 13
168ADC<4>Analog input 4
169VD<14>Video bus bit 14
170ADC<5>Analog input 5
171VD<15>Video bus bit 15
172ADC<6>Analog input 6
173VD<16>Video bus bit 16
174ADC<7>Analog input 7
175VD<17>Video bus bit 17
177VD<18>Video bus bit 18
178DN<0>Data negative for USB port 0
179VD<19>Video bus bit 19
180DP<0>Data positive for USB port 0
181VD<20>Video bus bit 20
182DN<1>Data negative for USB port 0
183VD<21>Video bus bit 21
184DP<1>Data positive for USB port 1
185VD<22>Video bus bit 22
186nTRSTInverted tap reset
187VD<23>Video bus bit 23
188TDITap data input
190TMSTap mode select
191VCC_RTCReal time clock supply
192TCKTap clock
193VINPower supply
194TDOTap data out
195VINPower supply
196nRESETInverted reset input
197VINPower supply
199VINPower supply

Simtec Electronics

Telephone +44 (0)1772 978010
Fax +44 (0)1772 816426
Mail Simtec Electronics,
Avondale Drive,
United Kingdom