HDMI Mezzanine Card User's Guide


HDMI Mezzanine Card – Revision B
User’s Guide
September 2012
Revision: EB55_01.1

HDMI Mezzanine Card – Revision B
User’s Guide
Introduction
LatticeECP3 Video Protocol Board includes a daughter card connection to support applications that can be implemented using SERDES. This daughter card connection includes three connectors for the signals of a whole
SERDES quad, the control/status signals and the power/ground pins.
The HDMI Mezzanine Card is a LatticeECP3 Video Protocol Board daughter card designed for demonstrating the
Lattice HDMI/DVI solution using LatticeECP3 SERDES. The scope of this user’s guide covers only revision B of the
HDMI Mezzanine Card. Please refer to EB52, LatticeECP3 Video Protocol Board Revision C User’s Guide for more
information about the LatticeECP3 device connection to the daughter card.
As shown in Figure 1, this card uses Single-Link 19-pin HDMI Type-A connectors. If using passive HDMI-to-DVI
cables, this card can also be used to support DVI video.
Figure 1. HDMI Mezzanine Card
Features
• Supports two different HDMI/DVI input paths, with or without the cable equalizer
• Supports HDMI/DVI output with TMDS level shifter
• TOSLINK fiber optic receiving module for S/PDIF audio input
• Headers for HPD, CEC controls and the EDID signals
• ESD protection devices for both HDMI/DVI inputs and HDMI/DVI outputs
Functional Description
There are four transmit channels and four receive channels in each of the LatticeECP3 SERDES quads. For implementing a Single Link HDMI or DVI interface, which includes three data channels and one clock channel, all four
transmit channels and three receive channels are used. The clock channel on the receive side is connected to the
dedicated SERDES differential reference clock pins. Since the common mode voltage of the HDMI/DVI TMDS sig-
2
HDMI Mezzanine Card – Revision B
User’s Guide
nals is different from the SERDES CML signals, and the TMDS coding scheme maintains the DC balance of the
signal, the AC coupling capacitors are used to block the DC component of the driving signal.
Figure 2 shows the functional block diagram of the HDMI Mezzanine Card. For validation purposes, this card is
designed to include two HDMI/DVI input ports. One of these input paths has a TMDS cable equalizer and the other
does not. The signals of both paths will go into the 2-to-1 TMDS MUX, then the AC coupling capacitors to the
SERDES input pins. Depending on which pins a shunt is installed on a 3-pin header, one of the two inputs will be
selected and the signals will be fed to the SERDES.
For meeting the HDMI/DVI’s strict electrical compliance test specification, a TMDS level shifter is added to the output path. This level shifter can be removed if the design does not have this requirement. The ESD protector is
added on both the input and output HDMI/DVI ports. Other than the HDMI/DVI, an S/PDIF input interface is also
included for bringing in a digital audio stream through the TOSLINK connector.
Figure 2. Functional Block Diagram
Clock
2
TMDS
2:1 Switch
(PI3HDMI1210-A)
4 Gbps
2
Clock
2
Data Pairs
6
Clock
2
AC Coupling
ESD
Protector
Input 1
Data Pairs
6
Data Pairs
Clock
2
ESD
Protector
TMDS Clock
TMDS
Level Shifter
(STHDLS101T)
3.4 Gbps
6
ESD
Protector
Input 2
6
TMDS
Equalizer
(STDVE001)
3.4 Gbps
Output
AC Coupling
Data Pairs
Regular
100-mil
Connector
10 Gbps Mezzanine Connector
6
Data Pairs
6
Clock
2
S/PDIF
TORX147
Figure 3 shows the HDMI Mezzanine Card installed on the LatticeECP3 Video Protocol Board. The two cables are
the HDMI cables connecting to J1 (HDMI/DVI input) and J3 (HDMI/DVI output) of the daughter card. A 12 mm tall
standoff is recommended for securing the HDMI Mezzanine Card on the LatticeECP3 Video Protocol Board
through screws.
3
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 3. HDMI Mezzanine Card Installed on the LatticeECP3 Video Protocol Board
Header Settings
This section describes the header settings on the HDMI Mezzanine Card. However, since the card uses SERDES
quad C when plugging into the LatticeECP3 Video Protocol Board, the VCCOB and the VCCIB of SERDES quad C
need to be powered properly. Please make sure shuts are installed on J18 and J22 of the LatticeECP3 Video Protocol Board.
As mentioned previously, the selection of the two HDMI/DVI inputs is done by a 3-pin header. Table 1 shows the
locations of where the shunt should be installed.
Table 1. MUX Selection Control
HDMI/DVI
Input
Shunt Installation
on H13
Mode
MUX Select
J1
Equalized HDMI/DVI Input
High
Pin 1/Pin 2
J2
Non-Equalized HDMI/DVI Input
Low
Pin 2/Pin 3
Other than the TMDS clock and data pairs, the HDMI/DVI interface includes CEC, HPD and the DDC clock and
data signals. By installing shuts on different locations of the 12 headers, these signals can be selected to be
bypassed from the HDMI/DVI input to the HDMI/DVI output, or they can be selected to be connected to the
LatticeECP3 FPGA on the LatticeECP3 Video Protocol Board.
Figure 4 shows the locations of these 12 headers on the HDMI Mezzanine Card and the signals these headers
control. The 12 headers are divided into four groups as shown in Figure 4. Each group includes three headers for
controlling one of the four signals. The black square is used to indicate pin 1 of each header.
4
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 4. Headers for CEC, HDP, S Settings, LatticeECP3 Video Protocol Board
J3 (HDMI Out)
J3 (HDMI Out)
H12, H11, H10, H9
are associated with
HDMI Out
H12, H11, H10, H9
J2 (HDMI Input 2)
J2 (HDMI Input 2)
H8, H7, H6, H5
are associated
with HDMI Input 2
H6, H5
H8, H7
J1 (HDMI Input 1)
J1 (HDMI Input 1)
TOSLINK (S/PDIF)
TOSLINK (S/PDIF)
H4, H3, H2, H1
are associated with HDMI Input 1
H4, H3, H2, H1
H10, H6, H2
are for SDA
control
J3 (HDMI Out)
H9, H5, H1
are for SCL
control
J3 (HDMI Out)
J2 (HDMI Input 2)
J2 (HDMI Input 2)
J1 (HDMI Input 1)
J1 (HDMI Input 1)
TOSLINK (S/PDIF)
TOSLINK (S/PDIF)
H12, H8, H4 are for CEC control
H11, H7, H3 are for HPD control
Figure 5 is a conceptual connection of the header connections. This applies to all four signals. An example of the
connection is shown in Figure 6. In this example, the shunts are installed on pin1/pin 2 of H9 ~ H12 and pin2/pin3
of H1 ~ H4. This will bypass the four signals between J1 and J3.
5
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 5. Conceptual Connection for Headers H1 to H12
H12, H11,
H10, H9
J3 (HDMI Out)
LatticeECP3
FPGA
H8, H7,
H6, H5
J2 (HDMI Input 2)
TMDS
Equalizer
H4, H3,
H2, H1
J1 (HDMI Input 1)
Figure 6. Example for Bypassing CEC, HPD, SDA, SCL Between J1 and J3
H12, H11,
H10, H9
J3 (HDMI Out)
LatticeECP3
FPGA
H8, H7,
H6, H5
J2 (HDMI Input 2)
TMDS
Equalizer
H4, H3,
H2, H1
J1 (HDMI Input 1)
Technical Support Assistance
Hotline: 1-800-LATTICE (North America)
+1-503-268-8001 (Outside North America)
e-mail: [email protected]
Internet: www.latticesemi.com
Revision History
Date
Version
Change Summary
September 2010
01.0
Initial release.
September 2012
01.1
Added Appendix B. Hardware Variants.
Updated document with new corporate logo.
© 2012 Lattice Semiconductor Corp. All Lattice trademarks, registered trademarks, patents, and disclaimers are as
listed at www.latticesemi.com/legal. All other brand or product names are trademarks or registered trademarks of
their respective holders. The specifications and information herein are subject to change without notice.
6
HDMI Mezzanine Card – Revision B
User’s Guide
Appendix A. Schematic
7
8
HDMI Equalizer
TMDS Switch
HDMI Output Port
7
8
9
3
2
Internal Version 0.02
1
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
C
D
Date:
B
Size
Title
Tuesday, March 02, 2010
Document Number
1
Sheet
GDA09CB004B
COVER PAGE
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
1
of
11
Rev
B
A
Board Accessories
I2C, HPD, CEC Selection
6
B To B Connectors and Audio Input
HDMI Input Ports
5
11
Power Scheme
4
10
Block Diagram
3
Description
Cover Page
Revision History
1
2
Page
HDMI MEZZANINE CARD - LATTICE SEMICONDUCTOR CORPORATION
2
A
4
3
COVER PAGE
B
5
4
B
C
D
5
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 7. Cover Page
9
A
B
C
D
5
5
B
A
4
Revision
4
15-Jun-2009
17-Jun-2009
24-Jun-2009
0.10
0.11
0.12
3
11-Jun-2009
0.09
2
'GDA confidential' is removed from all pages as per customer feedback
2-Mar-2010
0.02
Date:
B
Size
Title
1
1
Sheet
GDA09CB004B
2
of
11
Rev
B
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
REVISION HISTORY
Tuesday, March 02, 2010
Document Number
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
Internal Version 0.02
Clock cleaner is removed and eight 50ohms pullup resistors are added
for the HDMI output port as per customer requirement
11-Feb-2010
0.01
Customer Feedbacks implemented on decoupling caps for U3, U8
Customer Feedbacks implemented
Customer Feedbacks implemented
Version change after customer modification of schematics for HDMI Equivalizer
Customer Feedbacks implemented
Customer Feedbacks implemented
Pin mapping table modified. Pullups added for output signals
from ECP3 board. SPDIF data assigned to MZ_CTRL13
Pin Mapping table added for Mezzanine and control signal connectors
09-Jun-2009
03-Jun-2009
0.06
10-Jun-2009
02-Jun-2009
0.05
Single Ended signals swapping done at control signal connector
for layout feasibility
HDMI signals swapping done for layout feasibility
0.08
29-May-2009
0.04
2
Jumper options for DDC, HPD and CEC lines modified
Initial release
Description
0.07
27-May-2009
20-May-2009
0.03
18-May-2009
0.02
Release Date
0.01
Verison
3
REVISION HISTORY
A
B
C
D
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 8. Revision History
3
Internal Version 0.02
1
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
10
4
3
Date:
B
Size
Title
Tuesday, March 02, 2010
Document Number
1
Sheet
GDA09CB004B
BLOCK DIAGRAM
3
of
11
Rev
B
A
A
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
B
B
5
C
2
2
C
BLOCK DIAGRAM
D
4
D
5
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 9. Block Diagram
Internal Version 0.02
1
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
11
4
3
Date:
B
Size
Title
Tuesday, March 02, 2010
Document Number
1
Sheet
GDA09CB004B
POWER SCHEME
4
of
11
Rev
B
A
A
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
B
B
5
C
2
2
C
POWER SCHEME
3
D
4
D
5
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 10. Power Scheme
A
B
C
D
DDC/CEC GROUND
+5V POWER
HOT PLUG DETECT
18
19
NC
14
17
CEC
13
SDA
TMDS CLOCK-
12
16
TMDS CLOCK SHIELD
SCL
TMDS CLOCK+
11
15
TMDS DATA0-
10
TMDS DATA1-
6
9
TMDS DATA1 SHIELD
5
TMDS DATA0 SHIELD
TMDS DATA1+
4
8
TMDS DATA2-
3
TMDS DATA0+
TMDS DATA2 SHIELD
7
TMDS DATA2+
2
NAME
1
5
PIN NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
500254_1927
20
21
22
23
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
J1SDA
J1SCL
J2SDA
J2SCL
D1
B340LA-13-F
51E SCL_HDMI1
51E SDA_HDMI1
51E SCL_HDMI2
51E SDA_HDMI2
HPD_HDMI2
R69
R70
HDMI2_CLKCEC_HDMI2
HDMI2_DATA0HDMI2_CLK+
HDMI2_DATA1HDMI2_DATA0+
HDMI2_DATA2HDMI2_DATA1+
HDMI2_DATA2+
D2
B340LA-13-F
HPD_HDMI1
R67
R68
HDMI1_CLKCEC_HDMI1
HDMI1_DATA0HDMI1_CLK+
HDMI1_DATA1HDMI1_DATA0+
HDMI1_DATA2HDMI1_DATA1+
HDMI1_DATA2+
VDD_5V0_HDMI2
1
3
4
3
26
25
24
C28
0.1uF
10V
29
28
27
HDMI2_DATA0+
C2
0.1uF
10V
CEC_HDMI2
SCL_HDMI2
SDA_HDMI2
HPD_HDMI2
HDMI2_CLK-
HDMI2_CLK+
HDMI2_DATA0-
HDMI2_DATA1-
23
22
21
20
26
25
24
32
31
30
HDMI2_DATA1+
HDMI2_DATA2-
35
34
33
38
37
36
HDMI2_DATA2+
C1
0.1uF
10V
CEC_HDMI1
SCL_HDMI1
SDA_HDMI1
HPD_HDMI1
HDMI1_CLK-
HDMI2_ESDBYPASS
29
28
27
HDMI1_CLK+
HDMI1_DATA0-
23
22
21
20
32
31
30
HDMI1_DATA0+
HDMI1_DATA1-
HDMI1_DATA2HDMI1_DATA1+
38
37
36
35
34
33
C27
0.1uF
10V
HDMI1_ESDBYPASS
HDMI1_DATA2+
HDMI INPUT PORTS
Note
---------The 5V Supply of the HDMI Input connectors are not used
in the Mezz card since there is no EDID EEPROM available in the card
20
21
22
23
J2
HDMI Input -2
1
500254_1927
20
21
22
23
TP2
Test_Pad
20
21
22
23
J1
HDMI Input -1
1
2
27K CEC1_PULL 1
R1
2
CEC2_PULL 1
27K
R5
TP1
Test_Pad
2K
R2
2K
R6
VDD_5V0_HDMI1
2K
R3
2K
4
1K
R4
1K
R7
12
R8
5
2
CM2021
CE_REMOTE_OUT
DDC_CLK_OUT
DDC_DAT_OUT
HOTPLUG_DET_OUT
TMDS_CK2+
TMDS_GND5
TMDS_CK2-
TMDS_D0+_2
TMDS_GND6
TMDS_D0-_2
TMDS_D1+_2
TMDS_GND7
TMDS_D1-_2
TMDS_D2+_2
TMDS_GND8
TMDS_D2-_2
NC
ESD_BYP
GND2
U2
CM2021
CE_REMOTE_OUT
DDC_CLK_OUT
DDC_DAT_OUT
HOTPLUG_DET_OUT
TMDS_CK2+
TMDS_GND5
TMDS_CK2-
TMDS_D0+_2
TMDS_GND6
TMDS_D0-_2
TMDS_D1+_2
TMDS_GND7
TMDS_D1-_2
TMDS_D2+_2
TMDS_GND8
TMDS_D2-_2
NC
ESD_BYP
GND2
U1
2
1
2
3
16
17
18
19
13
14
15
10
11
12
7
8
9
4
5
6
1
2
3
VDD_5V0
16
17
18
19
13
14
15
10
11
12
7
8
9
4
5
6
VDD_3V3
VDD_3V3
Date:
B
Size
Title
CEC_HDMI_IN2
SCL_HDMI_IN2
SDA_HDMI_IN2
HPD_HDMI_IN2
HDMI2_CLK-
HDMI2_CLK+
HDMI2_DATA0-
HDMI2_DATA0+
HDMI2_DATA1-
HDMI2_DATA1+
HDMI2_DATA2-
HDMI2_DATA2+
CEC_HDMI_IN1
SCL_HDMI_IN1
SDA_HDMI_IN1
HPD_HDMI_IN1
HDMI1_CLK-
HDMI1_CLK+
HDMI1_DATA0-
HDMI1_DATA0+
HDMI1_DATA1-
HDMI1_DATA1+
HDMI1_DATA2-
HDMI1_DATA2+
Tuesday, March 02, 2010
Document Number
HDMI INPUT PORTS
1
Sheet
GDA09CB004B
[7]
[6]
[6]
[6]
[6]
[8]
[8]
[8]
[8]
[8]
[8]
[6]
[6]
[6]
[6]
[7]
[8]
[8]
[7]
[7]
5
of
11
Rev
B
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
CEC_HDMI_IN2
SCL_HDMI_IN2
SDA_HDMI_IN2
HPD_HDMI_IN2
HDMI2_CLK-
HDMI2_CLK+
HDMI2_DATA0-
HDMI2_DATA0+
HDMI2_DATA1-
HDMI2_DATA1+
HDMI2_DATA2-
[7]
[7]
[7]
[7]
HDMI2_DATA2+
CEC_HDMI_IN1
SCL_HDMI_IN1
SDA_HDMI_IN1
HPD_HDMI_IN1
HDMI1_CLK-
HDMI1_CLK+
HDMI1_DATA0-
HDMI1_DATA0+
HDMI1_DATA1-
HDMI1_DATA1+
HDMI1_DATA2-
HDMI1_DATA2+
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
Internal Version 0.02
CE_REMOTE_IN
DDC_CLK_IN
DDC_DAT_IN
HOTPLUG_DET_IN
TMDS_CK1+
TMDS_GND4
TMDS_CK1-
TMDS_D0+_1
TMDS_GND3
TMDS_D0-_1
TMDS_D1+_1
TMDS_GND2
TMDS_D1-_1
TMDS_D2+_1
TMDS_GND1
TMDS_D2-_1
5V_SUPPLY
LV_SUPPLY
GND1
CE_REMOTE_IN
DDC_CLK_IN
DDC_DAT_IN
HOTPLUG_DET_IN
TMDS_CK1+
TMDS_GND4
TMDS_CK1-
TMDS_D0+_1
TMDS_GND3
TMDS_D0-_1
TMDS_D1+_1
TMDS_GND2
TMDS_D1-_1
TMDS_D2+_1
TMDS_GND1
TMDS_D2-_1
5V_SUPPLY
LV_SUPPLY
GND1
VDD_5V0
1
A
B
C
D
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 11. HDMI Input Ports
13
5
HPD_HDMI_IN1
4
3
2
1
H3
3
2
1
1x3
H7
3
2
1
SDA_HDMI_IN1
SDA_HDMI_IN2
SDA_HDMI1_EQ_EXT
SDA_HDMIOUT_LEVSHIFT
SDA_HDMIOUT_CM2020INT
JMP_SDA
3
3
2
1
3
2
1
3
2
1
H2
3
2
1
1x3
H6
3
2
1
1x3
H10
3
2
1
SCL_HDMI_IN1
SCL_HDMI_IN2
SCL_HDMI1_EQ_EXT
SCL_HDMIOUT_LEVSHIFT
SCL_HDMIOUT_CM2020INT
JMP_SCL
2
3
2
1
3
2
1
3
2
1
H1
3
2
1
1x3
H5
3
2
1
1x3
H9
3
2
1
1x3
Internal Version 0.02
CEC_HDMIOUT_CM2020INT
CEC_HDMIOUT_MEZZCONN
HPD_HDMIOUT_CM2020INT
HPD_HDMIOUT_LEVSHIFT
SDA_HDMIOUT_CM2020INT
SDA_HDMIOUT_LEVSHIFT
SCL_HDMIOUT_CM2020INT
SCL_HDMIOUT_LEVSHIFT
CEC_HDMI1_EQ_EXT
CEC_HDMI_IN1
CEC_HDMI_IN2
HPD_HDMI1_EQ_EXT
HPD_HDMI_IN1
HPD_HDMI_IN2
SDA_HDMI1_EQ_EXT
SDA_HDMI_IN1
SDA_HDMI_IN2
SCL_HDMI1_EQ_EXT
SCL_HDMI_IN1
SCL_HDMI_IN2
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
[10]
[11]
[10]
[10]
[10]
[10]
CEC_HDMIOUT_CM2020INT
CEC_HDMIOUT_MEZZCONN
HPD_HDMIOUT_CM2020INT
HPD_HDMIOUT_LEVSHIFT
[10]
[10]
[7]
SDA_HDMIOUT_CM2020INT
SDA_HDMIOUT_LEVSHIFT
SCL_HDMIOUT_CM2020INT
SCL_HDMIOUT_LEVSHIFT
[7]
[7]
[7]
CEC_HDMI1_EQ_EXT
CEC_HDMI_IN1
[5]
CEC_HDMI_IN2
[5]
HPD_HDMI1_EQ_EXT
HPD_HDMI_IN1
[5]
HPD_HDMI_IN2
[5]
SDA_HDMI1_EQ_EXT
SDA_HDMI_IN1
[5]
SDA_HDMI_IN2
[5]
SCL_HDMI1_EQ_EXT
SCL_HDMI_IN1
[5]
SCL_HDMI_IN2
[5]
1
C
D
Date:
B
Size
Title
Tuesday, March 02, 2010
Document Number
1
Sheet
GDA09CB004B
6
of
I2C, HPD, CEC SELECTION
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
11
Rev
B
A
H4
3
2
1
1x3
H8
3
2
1
1x3
3
2
1
HPD_HDMI_IN2
HPD_HDMI1_EQ_EXT
3
2
1
1x3
3
2
1
H11
HPD_HDMIOUT_LEVSHIFT
HPD_HDMIOUT_CM2020INT
JMP_HPD
H12
3
2
1
1x3
2
A
3
2
1
3
2
1
3
2
1
1x3
HPD, CEC, I2C SELECTION
3
B
CEC_HDMI_IN1
CEC_HDMI_IN2
CEC_HDMI1_EQ_EXT
CEC_HDMIOUT_MEZZCONN
CEC_HDMIOUT_CM2020INT
JMP_CEC
1x3
4
B
C
D
5
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 12. I2C, HPD, CEC Selection
14
A
B
C
[11]
[11]
HDMI_EQ_BOOST1
HDMI_EQ_BOOST2
OE#_HDMI_EQUALIZER
CEC_HDMI1_EQ_EXT
HPD_HDMI1_EQ_EXT
DDC_EN_EQUALIZER
DDC_EN_EQUALIZER
CD60
0.01uF
0.01uF
0.01uF
0.01uF
CD62
4
0.01uF
CD63
CEC_HDMI1_EQ_EXT
CD59
PRE_EQUALIZER
SDA_HDMI1_EQ_EXT
OE#_HDMI_EQUALIZER
SCL_HDMI1_EQ_INT
SDA_HDMI1_EQ_INT
SCL_HDMI1_EQ_EXT
HPD_HDMI1_EQ_INT
CD61
HDMI1_DATA2+
HDMI1_DATA2-
[5]
[5]
HPD_HDMI1_EQ_EXT
VDD_3V3
VDD_3V3
HDMI1_DATA1+
HDMI1_DATA1-
[5]
[5]
CEC_HDMI1_EQ_INT
5
VDD_3V3
[11]
[6]
[6]
[11]
HDMI1_DATA0+
HDMI1_DATA0-
[5]
[5]
SCL_HDMI1_EQ_EXT
SDA_HDMI1_EQ_EXT
HDMI1_CLK+
HDMI1_CLK-
[5]
[5]
4
HDMI_EQ_BOOST2
HDMI_EQ_BOOST1
47K
R65
47K
R64
47K
R13
47K
R12
47K
R11
47K
R10
47K
R63
47K
R66
4.7K
R62
4.7K
R15
4.7K
R14
[6]
[6]
4.7K
nm
R56
D
4.7K
nm
R57
0.01uF
CD64
0.01uF
CD65
0.01uF
CD66
VDD_3V3
STDVE001A
CD3
0.1uF
10V
CD4
1000pF
50V
3
De-Caps for HDMI Equalizer
CD2
1000pF
50V
VDD_3V3
EQ_BOOST1
EQ_BOOST2
OE#
CEC_IO
HPD_EXT
DDC_EN
SCL_EXT
SDA_EXT
IN_D4+
IN_D4-
IN_D3+
IN_D3-
IN_D2+
IN_D2-
IN_D1+
IN_D1-
U3
CD1
0.1uF
10V
34
35
HDMI_EQ_BOOST1
HDMI_EQ_BOOST2
CEC_HDMI1_EQ_EXT
25
7
3
HPD_HDMI1_EQ_EXT
OE#_HDMI_EQUALIZER
32
48
47
HDMI1_DATA2+
HDMI1_DATA2-
DDC_EN_EQUALIZER
45
44
HDMI1_DATA1+
HDMI1_DATA1-
9
8
42
41
HDMI1_DATA0+
HDMI1_DATA0-
SCL_HDMI1_EQ_EXT
SDA_HDMI1_EQ_EXT
39
38
HDMI1_CLK+
HDMI1_CLK-
3
B3
CD5
0.1uF
10V
CEC_HDMI1_EQ_INT
6
CD6
1000pF
50V
3000mA
CD7
0.1uF
10V
2
B1
AGND
CD9
0.1uF
10V
HPD_HDMI1_EQ_INT
30
4
CD8
1000pF
50V
SCL_HDMI1_EQ_INT
SDA_HDMI1_EQ_INT
28
29
AGND
HDMI_EQ_DATA2+
HDMI_EQ_DATA2-
13
14
R9
4.70K
1%
HDMI_EQ_DATA1+
HDMI_EQ_DATA1-
16
17
REXT_EQ
HDMI_EQ_DATA0+
HDMI_EQ_DATA0-
19
20
10
HDMI_EQ_CLK+
HDMI_EQ_CLK-
2
22
23
STDVE001A
REXT
PRE
CEC_IO_INT
HPD_INT
SCL_INT
SDA_INT
OUT_D4+
OUT_D4-
OUT_D3+
OUT_D3-
OUT_D2+
OUT_D2-
OUT_D1+
OUT_D1-
HDMI EQUALIZER
11
VDD_EXT
26
VDD_INT
2
15
21
33
40
46
VCC1
VCC2
VCC3
VCC4
VCC5
VCC6
GND1
GND2
GND3
GND4
GND5
GND6
GND7
GND8
GND9
GND10
1
5
12
18
24
27
31
36
37
43
E_PAD
49
5
CD10
1000pF
50V
3000mA
PRE_EQUALIZER
[11]
CD12
1000pF
50V
Date:
B
Size
Title
CD13
0.1uF
10V
CD14
1000pF
50V
Tuesday, March 02, 2010
Document Number
1
Sheet
GDA09CB004B
CD16
1000pF
50V
7
of
11
Rev
B
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
CD15
0.1uF
10V
HDMI EQUALIZER
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
Internal Version 0.02
[11]
[11]
CD11
0.1uF
10V
CEC_HDMI1_EQ_INT
HPD_HDMI1_EQ_INT
[11]
[11]
[8]
[8]
[8]
[8]
[8]
[8]
[8]
[8]
SCL_HDMI1_EQ_INT
SDA_HDMI1_EQ_INT
HDMI_EQ_DATA2+
HDMI_EQ_DATA2-
HDMI_EQ_DATA1+
HDMI_EQ_DATA1-
HDMI_EQ_DATA0+
HDMI_EQ_DATA0-
HDMI_EQ_CLK+
HDMI_EQ_CLK-
1
A
B
C
D
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 13. HDMI Equalizer
15
A
B
C
D
HDMI_EQ_DATA2+
HDMI_EQ_DATA2HDMI_EQ_DATA1+
HDMI_EQ_DATA1-
[7]
[7]
[7]
[7]
5
----> TMDS Switch Output
4
Equalized HDMI Channel
Un Equalized HDMI Channel ----> TMDS Switch Output
44
43
42
41
39
38
37
36
35
34
33
32
HDMI2_DATA0+
HDMI2_DATA0HDMI2_CLK+
HDMI2_CLK-
HDMI_EQ_DATA2+
HDMI_EQ_DATA2HDMI_EQ_DATA1+
HDMI_EQ_DATA1HDMI_EQ_DATA0+
HDMI_EQ_DATA0HDMI_EQ_CLK+
HDMI_EQ_CLK-
4.7K TMDS_SW_0B2
4.7K TMDS_SW_1B2
4.7K TMDS_SW_EN#
4.7K TMDS_SW_IN
R19
R21
R22
R23
23
21
28
26
29
27
CD18
1000pF
50V
CD27
0.1uF
10V
CD28
1000pF
50V
VDD_5V0
CD17
0.1uF
10V
VDD_3V3
VDD_3V3
VDD_5V0
PI3HDMI1210-A
HDMI
SWITCH
D0+
D0-
CD20
1000pF
50V
3
CD21
0.1uF
10V
CD22
1000pF
50V
3
4
2
16
24
18
20
11
12
9
10
5
6
CD23
0.1uF
10V
DATA0+
DATA0-
DATA1+
DATA1-
DATA2+
DATA2-
0.1uF
0.1uF
C15
C14
TMDS_SW_CP1
TMDS_SW_CP2
TMDS_SW_CP3
CD24
1000pF
50V
C10
0.1uF
10V
0.1uF
0.1uF
C7
C8
CD25
0.1uF
10V
CD26
1000pF
50V
2
HDMIIN_CLEANED_CLK+
HDMIIN_CLEANED_CLK-
HDMIIN_DATA0+
HDMIIN_DATA0-
HDMIIN_DATA1+
HDMIIN_DATA1-
HDMIIN_DATA2+
HDMIIN_DATA2-
C11
0.1uF
10V
4.7K
4.7K
0.1uF
0.1uF
0.1uF
0.1uF
C5
C6
C3
C4
TMDS_SW_A0 R18
TMDS_SW_A1 R20
C9
0.1uF
10V
2
[11]
[11]
[11]
[11]
[11]
[11]
[11]
[11]
Date:
B
Size
HDMIIN_CLK-
R79
Tuesday, March 02, 2010
Document Number
1
Sheet
GDA09CB004B
TMDS SWITCH
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
Internal Version 0.02
Title
R77
R78
R76
HDMIIN_CLK+
DATA0+
R75
R74
R73
R72
DATA0-
DATA1-
DATA1+
DATA2-
DATA2+
1
51
51
51
51
51
51
51
51
VDD_3V3
8
of
11
Rev
B
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
NOTE: Place resistors closer to AC coupling caps
HDMIIN_CLEANED_CLK+
HDMIIN_CLEANED_CLK-
HDMIIN_DATA0+
HDMIIN_DATA0-
HDMIIN_DATA1+
HDMIIN_DATA1-
HDMIIN_DATA2+
HDMIIN_DATA2-
NOTE: Place capacitors nearer to J4 as close as possible
HDMIIN_CLK+
HDMIIN_CLK-
PI3HDMI1210-A
CP1
CP2
CP3
A0
A1
CLK+
CLK-
D2+
D2-
D1+
D1-
De-Caps for TMDS Switch
EN#
IN
0B2
1B2
0B1
1B1
SEL
CLK+B
CLK-B
D2+B
D2-B
D1+B
D1-B
D0+B
D0-B
3
TMDS SWITCH
CLK+A
CLK-A
D2+A
D2-A
D1+A
D1-A
D0+A
D0-A
U4
CD19
0.1uF
10V
Note
--------Side Band Channel Disabled
4.7K TMDS_SW_0B1
4.7K TMDS_SW_1B1
8
46
45
HDMI2_DATA1+
HDMI2_DATA1-
TMDSSWITCH_CHAN_SEL
48
47
HDMI2_DATA2+
HDMI2_DATA2-
R16
R17
HDMI_EQ_CLK+
HDMI_EQ_CLK-
VDD_3V3
[7]
[7]
HDMI_EQ_DATA0+
HDMI_EQ_DATA0-
HDMI2_CLK+
HDMI2_CLK-
[5]
[5]
[7]
[7]
HDMI2_DATA0+
HDMI2_DATA0-
[5]
[5]
SEL Pin = High
HDMI Input Channel Select
1
2
3
VDD_3V3
HDMI2_DATA1+
HDMI2_DATA1-
[5]
[5]
SEL Pin = Low
1x3
1
2
3
H13
HDMI2_DATA2+
HDMI2_DATA2-
[5]
[5]
4
22
VDD5V
1
7
14
31
40
VDD3V3_1
VDD3V3_2
VDD3V3_3
VDD3V3_4
VDD3V3_5
GND1
GND2
GND3
GND4
GND5
GND6
13
15
17
19
25
30
5
A
B
C
D
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 14. TMDS Switch
A
B
C
CD42
0.1uF
10V
VDD_3V3
CD51
0.1uF
10V
VDD_3V3
HDMIOUT_DATA2+
HDMIOUT_DATA2-
[11]
[11]
CD43
1000pF
50V
CD52
1000pF
50V
[11]
[11]
[11]
HDMIOUT_DATA1+
HDMIOUT_DATA1-
VDD_3V3
8
SDA_HDMIOUT_MEZZCONN
CD45
1000pF
50V
5
STHDLS101T
VDD_3V3
B4
TMDSOUT_DATA2+
TMDSOUT_DATA2-
HPD_HDMIOUT_LEVSHIFT
SCL_HDMIOUT_LEVSHIFT
SDA_HDMIOUT_LEVSHIFT
REXT_HDMI_LEVSHIFT
13
14
30
28
29
6
3000mA
VDD_3V3
TMDSOUT_DATA1+
TMDSOUT_DATA1-
16
17
STHDLS101T
REXT
SDA_SINK
SCL_SINK
HPD_SINK
OUT_D4+
OUT_D4-
OUT_D3+
OUT_D3-
TMDSOUT_DATA0+
TMDSOUT_DATA0-
19
20
CD55
0.1uF
10V
CD56
1000pF
50V
CD46
0.1uF
10V
CD47
1000pF
50V
CD48
0.1uF
10V
CD49
1000pF
50V
CD58
1000pF
50V
4
HPD_HDMIOUT_CM2020INT
HPD_HDMIOUT_MEZZCONN
CD57
0.1uF
10V
SDA_HDMIOUT_CM2020INT
SCL_HDMIOUT_MEZZCONN
CD68
0.01uF
CD67
0.01uF
0.01uF
CD69
0.01uF
CD70
CEC_HDMIOUT_CM2020INT
SCL_HDMIOUT_CM2020INT
SDA_HDMIOUT_CM2020INT
HPD_HDMIOUT_CM2020INT
HPD_HDMIOUT_LEVSHIFT
SCL_HDMIOUT_LEVSHIFT
SDA_HDMIOUT_LEVSHIFT
[6]
[6]
[6]
0.01uF
CD71
0.01uF
CD72
0.01uF
CD73
CEC_HDMIOUT_CM2020INT
SCL_HDMIOUT_CM2020INT
SDA_HDMIOUT_CM2020INT
HPD_HDMIOUT_CM2020INT
HPD_HDMIOUT_LEVSHIFT
SCL_HDMIOUT_LEVSHIFT
SDA_HDMIOUT_LEVSHIFT
CEC_HDMIOUT_CM2020INT
SCL_HDMIOUT_CM2020INT
OE#_HDMI_LEV_SHIFT
De-Caps for HDMI Level Shifter
CD44
0.1uF
10V
DDC_EN
SDA_SOURCE
SCL_SOURCE
HPD_SOURCE
OE#
IN_D4+
IN_D4-
IN_D3+
IN_D3-
OUT_D2+
OUT_D2-
OUT_D1+
OUT_D1-
SDA_HDMIOUT_MEZZCONN
De-Caps for HDMI Level Shifter
CD54
1000pF
50V
IN_D1+
IN_D1IN_D2+
IN_D2-
HDMIOUT_DDC_EN
32
9
SCL_HDMIOUT_MEZZCONN
HDMIOUT_DDC_EN
7
HPD_HDMIOUT_MEZZCONN
OE#_HDMI_LEV_SHIFT 25
ST_HDMIOUT_DATA2+ 48
ST_HDMIOUT_DATA2- 47
ST_HDMIOUT_DATA1+ 45
ST_HDMIOUT_DATA1- 44
De-Caps for HDMI Level Shifter
HDMIOUT_DDC_EN
CD53
0.1uF
10V
[11]
SDA_HDMIOUT_MEZZCONN
SCL_HDMIOUT_MEZZCONN
HPD_HDMIOUT_MEZZCONN
OE#_HDMI_LEV_SHIFT
3.3uF
3.3uF
C23
C24
HDMIOUT_DATA2+
HDMIOUT_DATA2-
[11]
3.3uF
3.3uF
C21
C22
HDMIOUT_DATA1+
HDMIOUT_DATA1-
ST_HDMIOUT_DATA0+ 42
ST_HDMIOUT_DATA0- 41
4.7K
R49
[11]
[11]
3.3uF
3.3uF
C19
C20
HDMIOUT_DATA0+
HDMIOUT_DATA0-
4.7K
R50
HDMIOUT_DATA0+
HDMIOUT_DATA0-
TMDSOUT_DATACLK+
TMDSOUT_DATACLK-
22
23
3
[6]
[6]
[6]
[6]
R71 nm 4.7K
ANALOG2
R42
4.7K
10
4.7K
R51
HDMIOUT_CLK+
HDMIOUT_CLK-
39
38
ANALOG2
4.7K
R60
[11]
[11]
ST_HDMIOUT_CLK+
ST_HDMIOUT_CLK-
FUNCTION1
FUNCTION2
FUNCTION3
FUNCTION4
4.7K
R61
[11]
[11]
3.3uF
3.3uF
C16
C17
HDMIOUT_CLK+
HDMIOUT_CLK-
3
4
34
35
U8
2
11
15
21
26
33
40
46
VCC3V3_1
VCC3V3_2
VCC3V3_3
VCC3V3_4
VCC3V3_5
VCC3V3_6
VCC3V3_7
VCC3V3_8
GND1
GND2
GND3
GND4
GND5
GND6
GND7
GND8
GND9
GND10
1
5
12
18
24
27
31
36
37
43
47K
R48
D
47K
R46
VDD_3V3
47K
R45
EPAD
49
47K
R47
3
0.01uF
CD74
nm
TMDS CLOCK SHIELD
TMDS CLOCKCEC
12
13
SCL
SDA
DDC/CEC GROUND
+5V POWER
HOT PLUG DETECT
15
16
17
18
19
NC
TMDS CLOCK+
11
14
TMDS DATA0-
TMDS DATA0 SHIELD
10
TMDS DATA0+
8
9
TMDS DATA17
TMDS DATA1 SHIELD
5
6
TMDS DATA2TMDS DATA1+
4
TMDS DATA2 SHIELD
TMDS DATA2+
NAME
2
TMDS_CK2+
TMDS_GND5
TMDS_CK2-
TMDS_D0+_2
TMDS_GND6
TMDS_D0-_2
TMDS_D1+_2
TMDS_GND7
TMDS_D1-_2
TMDS_D2+_2
TMDS_GND8
TMDS_D2-_2
5V_OUT
ESD_BYP
GND2
TMDSOUT_DATACLKCEC_OUT
Date:
B
Size
Title
C26
0.1uF
CEC_OUT
SCL_OUT
SDA_OUT
HPD_OUT
J3
20
21
22
23
500254_1927
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Tuesday, March 02, 2010
Document Number
1
Sheet
GDA09CB004B
HDMI OUTPUT PORT
9
of
11
Rev
B
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
R43
15K
TMDSOUT_DATACLK-
HDMI Output
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
0.1uF
0.1uF
TMDSOUT_DATACLK+
TMDSOUT_DATA0-
TMDSOUT_DATA0+
TMDSOUT_DATA1-
TMDSOUT_DATA1+
TMDSOUT_DATA2-
TMDSOUT_DATA2+
C18
C25
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
Internal Version 0.02
HPD_OUT
1
CM2020_ESDBP
VDD_5V0_HDMIOUT
TMDSOUT_DATA0TMDSOUT_DATACLK+
TMDSOUT_DATA1TMDSOUT_DATA0+
TMDSOUT_DATA2TMDSOUT_DATA1+
TMDSOUT_DATA2+
23
22
21
20
26
25
24
29
28
27
32
31
30
35
34
33
38
37
36
VDD_5V0_HDMIOUT
CM2020
CE_REMOTE_OUT
DDC_CLK_OUT
DDC_DAT_OUT
HOTPLUG_DET_OUT
SCL_OUT
SDA_OUT
CE_REMOTE_IN
DDC_CLK_IN
DDC_DAT_IN
HOTPLUG_DET_IN
TMDS_CK1+
TMDS_GND4
TMDS_CK1-
TMDS_D0+_1
TMDS_GND3
TMDS_D0-_1
TMDS_D1+_1
TMDS_GND2
TMDS_D1-_1
TMDS_D2+_1
TMDS_GND1
TMDS_D2-_1
5V_SUPPLY
LV_SUPPLY
GND1
U7
VDD_5V0_HDMIOUT
CEC_HDMIOUT_CM2020INT
SCL_HDMIOUT_CM2020INT
SDA_HDMIOUT_CM2020INT
HPD_HDMIOUT_CM2020INT
TMDSOUT_DATACLK-
16
17
18
19
13
14
15
TMDSOUT_DATACLK+
TMDSOUT_DATA0-
10
11
12
7
8
9
4
5
6
1
2
3
TMDSOUT_DATA0+
TMDSOUT_DATA1-
TMDSOUT_DATA1+
TMDSOUT_DATA2-
3
2
1
PIN NO
R44
4.70K
1%
R58
4.70K
1%
VDD_3V3
VDD_5V0
TMDSOUT_DATA2+
VDD_3V3
2
4.7K
R52
HDMI OUTPUT PORT
27K
4
4.7K
R53
16
R54
5
A
B
C
D
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 15. HDMI Output Port
A
B
C
D
[10]
[7]
5
HPD_HDMIOUT_MEZZCONN
HPD_HDMI1_EQ_INT
[8] HDMIIN_DATA0+
[8] HDMIIN_DATA0[8] HDMIIN_DATA1+
[8] HDMIIN_DATA1[8] HDMIIN_DATA2+
[8] HDMIIN_DATA2[9] HDMIIN_CLEANED_CLK+
[9] HDMIIN_CLEANED_CLK-
[10] SDA_HDMIOUT_MEZZCONN
[10] HDMIOUT_DDC_EN
[7] OE#_HDMI_EQUALIZER
[7] SDA_HDMI1_EQ_INT
[7] HDMI_EQ_BOOST1
1
3
5
7
9
11
13
15
17
19
H16
2
4
6
8
10
12
14
16
18
20
2x10
2
4
6
8
10
12
14
16
18
20
S/PDIF_DATA
1
2
3
4
5
6
7
8
9
10
11
12
J4
13
14
15
16
17
18
19
20
21
22
23
24
0750030005
13
14
15
16
17
18
19
20
21
22
23
24
Mezzanine Card Connector
1
2
3
4
5
6
7
8
9
10
11
12
Control Signal Connector
1
3
5
7
9
11
13
15
17
19
25
26
27
25
26
27
[10]
[10]
[10]
[10]
4
CEC_HDMI1_EQ_INT
[7]
CEC_HDMIOUT_MEZZCONN
HDMIOUT_DATA0+
HDMIOUT_DATA0HDMIOUT_DATA1+
[10]
HDMIOUT_DATA1[10]
HDMIOUT_DATA2+
HDMIOUT_DATA2HDMIOUT_CLK+
[10]
HDMIOUT_CLK[10]
SCL_HDMIOUT_MEZZCONN
[10]
OE#_HDMI_LEV_SHIFT
[10]
PRE_EQUALIZER
[7]
SCL_HDMI1_EQ_INT
[7]
HDMI_EQ_BOOST2 [7]
DDC_EN_EQUALIZER
[7]
[6]
3
3
B TO B CONNECTORS AND AUDIO IN
2
2
L1
H14
1x1
VDD_3V3
NC1
NC2
M1
1
Ground Post
1
3
5
7
9
2
4
6
8
10
2x5
2
4
6
8
10
+
-
CB7
47uF
20V
Date:
B
Size
Title
+
-
VDD_3V3
S/PDIF_DATA
1
Sheet
GDA09CB004B
10
of
11
Rev
B
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
0E
B TO B CONNECTORS AND AUDIO IN
Tuesday, March 02, 2010
Document Number
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
Internal Version 0.02
Power Connector
1
3
5
7
9
H17
CB6
47uF
20V
VDD_5V0
1
ST_S/PDIF_DATA R55
TORX147PL(F,T)
OUT
CD50
0.1uF
10V
S/P DIF CONNECTOR
4
5
47uH
VDD_3V3_TOSLINK
3
VCC
GND
2
4.7K
R59
4
1
17
1
5
A
B
C
D
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 16. B to B Connectors and Audio In
Z5
40mil Pad
Z1
165 mil Pad Size
Z7
100mil Drill Size
Z8
100mil Drill Size
Mounting Hole
3
2
Internal Version 0.02
Tel: 91-44-2253 7900
Fax: 91-44-2252 3514
www.gdatech.com
C
D
Date:
B
Size
Title
Tuesday, March 02, 2010
Document Number
1
Sheet
GDA09CB004B
11
BOARD ACCESSORIES
GDA Technologies Ltd,
L & T Infotech Park,
Mount Poonamallee Road,
Manapakkam, Ch 89
of
11
Rev
B
A
Tooling Holes
1
A
4
Fiducials
Z6
40mil Pad
2
B
5
Z4
40mil Pad
3
BOARD ACCESSORIES
B
C
1
1
1
1
1
1
1
1
1
1
Z3
40mil Pad
4
1
1
1
18
1
D
5
HDMI Mezzanine Card – Revision B
User’s Guide
Figure 17. Board Accessories
HDMI Mezzanine Card – Revision B
User’s Guide
Appendix B. Hardware Variants
Early versions of the HDMI Mezzanine Card Revision B were produced with U3 (STMicroelectronics STDVE001A
Adaptive single 3.4 Gbps TMDS/HDMI signal equalizer) populated. On the current version of the HDMI Mezzanine
Card Revision B, U3 is not populated.
To receive HDMI/DVI input when U3 is unpopulated:
• Connect the HDMI/DVI source using J2.
• Install a shunt between pin 2 and pin 3 of header H13 to route J2 HDMI/DVI signals to the FPGA via the Mezzanine connector.
On the current version of the board, the following additional changes were made:
• To support the Extended Display Identification Data (EDID) via the I2C interface of the FPGA, two modification
wires are installed in the following locations on the new HDMI Mezzanine Card Revision B:
– R15 (pad nearest U3) to R12 (pad nearest U3)
– R14 (pad nearest U3) to R11 (pad nearest U3)
These wires bridge the I2C bus around vacant U3.
• The resistors R2, R3, R6 and R7 are not populated (to reduce I2C bus pull-up strength).
• The resistors R71 and R58 are not populated (to correct a pull-down contention).
19