Texas Instruments Switch TPS2149 User Manual

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User’s Guide  
September 2001  
Mixed Signal Products  
SLVU050  
 
EVM IMPORTANT NOTICE  
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:  
This evaluation kit being sold by TI is intended for use for ENGINEERING  
DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to  
befitforcommercialuse. Assuch, thegoodsbeingprovidedmaynotbecompleteinterms  
of required design-, marketing-, and/or manufacturing-related protective considerations,  
including product safety measures typically found in the end product incorporating the  
goods. As a prototype, this product does not fall within the scope of the European Union  
directive on electromagnetic compatibility and therefore may not meet the technical  
requirements of the directive.  
Should this evaluation kit not meet the specifications indicated in the EVM Users Guide,  
the kit may be returned within 30 days from the date of delivery for a full refund. THE  
FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO  
BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR  
STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS  
FOR ANY PARTICULAR PURPOSE.  
The user assumes all responsibility and liability for proper and safe handling of the goods.  
Further, the user indemnifies TI from all claims arising from the handling or use of the  
goods. Please be aware that the products received may not be regulatory compliant or  
agency certified (FCC, UL, CE, etc.). Due to the open construction of the product, it is  
the users responsibility to take any and all appropriate precautions with regard to  
electrostatic discharge.  
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER  
PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL,  
INCIDENTAL, OR CONSEQUENTIAL DAMAGES.  
TI currently deals with a variety of customers for products, and therefore our arrangement  
with the user is not exclusive.  
TI assumes no liability for applications assistance, customer product design,  
software performance, or infringement of patents or services described herein.  
Please read the EVM Users Guide and, specifically, the EVM Warnings and Restrictions  
notice in the EVM Users Guide prior to handling the product. This notice contains  
important safety information about temperatures and voltages. For further safety  
concerns, please contact the TI application engineer.  
Personshandlingtheproductmusthaveelectronicstrainingandobservegoodlaboratory  
practice standards.  
No license is granted under any patent right or other intellectual property right of TI  
covering or relating to any machine, process, or combination in which such TI products  
or services might be or are used.  
Mailing Address:  
Texas Instruments  
Post Office Box 655303  
Dallas, Texas 75265  
Copyright 2001, Texas Instruments Incorporated  
 
EVM WARNINGS AND RESTRICTIONS  
It is important to operate this EVM within the specified input and output ranges described in  
the EVM Users Guide.  
Exceeding the specified input range may cause unexpected operation and/or irreversible  
damage to the EVM. If there are questions concerning the input range, please contact a TI  
field representative prior to connecting the input power.  
Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/or  
possible permanent damage to the EVM. Please consult the EVM Users Guide prior to  
connecting any load to the EVM output. If there is uncertainty as to the load specification,  
please contact a TI field representative.  
During normal operation, some circuit components may have case temperatures greater than  
60°C. The EVM is designed to operate properly with certain components above 60°C as long  
as the input and output ranges are maintained. These components include but are not limited  
tolinearregulators, switchingtransistors, passtransistors, andcurrentsenseresistors. These  
types of devices can be identified using the EVM schematic located in the EVM Users Guide.  
When placing measurement probes near these devices during operation, please be aware  
that these devices may be very warm to the touch.  
Mailing Address:  
Texas Instruments  
Post Office Box 655303  
Dallas, Texas 75265  
Copyright 2001, Texas Instruments Incorporated  
 
Preface  
Read This First  
How to Use This Manual  
This document contains the following chapters:  
- Chapter 1 Introduction  
- Chapter 2 Hardware Overview  
- Chapter 3 EVM Operation  
- Chapter 4 Bill of Materials  
- Chapter 5 EVM Layout  
Related Documentation From Texas Instruments  
TPS2149 3.3-V LDO and Dual Switch data sheet, literature number SLVS401.  
TUSB2136 USB Keyboard Hub Controller data sheet, literature number  
SLLS442.  
FCC Warning  
Thisequipmentisintendedforuseinalaboratorytestenvironmentonly. Itgen-  
erates, uses, and can radiate radio frequency energy and has not been tested  
for compliance with the limits of computing devices pursuant to subpart J of  
part 15 of FCC rules, which are designed to provide reasonable protection  
against radio frequency interference. Operation of this equipment in other en-  
vironments may cause interference with radio communications, in which case  
the user at his own expense will be required to take whatever measures may  
be required to correct this interference.  
v
 
vi  
 
Contents  
1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1  
1.1  
Required Hardware and Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
2
3
Hardware Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1  
EVM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1  
3.1  
3.2  
3.3  
3.4  
3.5  
3.6  
TPS2149 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Interfaces and USB Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Light Emitting Diodes (LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Jumpers and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
4
5
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1  
EVM Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1  
Figures  
11  
51  
52  
USB Keyboard/Hub EVM Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
TPS2149 Silk Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1  
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2  
Tables  
31  
32  
33  
41  
LED Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Jumpers and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
QWERTY Keyboard Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
EVM Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1  
vii  
 
viii  
 
Chapter 1  
Introduction  
This users guide describes the setup and operation of the USB keyboard/hub  
evaluation module (EVM). Information and instruction presented throughout  
this document assumes user familiarity with universal serial bus (USB)  
protocol and the use of common lab testing equipment.  
Topic  
Page  
1.1 Required Hardware and Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
1-1  
 
Required Hardware and Software  
1.1 Required Hardware and Software  
The USB keyboard/hub EVM is designed for use with a personal computer  
running a USB-enabled operating system. The PC, with BIOS, chipsets, and  
operating system, should be USB 1.1 specification-compliant. If the BIOS is  
not compliant, the system may not boot when USB devices are connected at  
power up, and the EVM may not function in DOS mode. Additionally, one or  
more USB devices are needed to plug into the downstream ports of the USB  
keyboard/hub EVM to exercise the hub ports. A standard USB cable is needed  
to connect the USB keyboard/hub EVM to a downstream port of the PC or a  
USB hub tier.  
Figure 11. USB Keyboard/Hub EVM Hardware  
USB EVM  
1-2  
 
Chapter 2  
Hardware Overview  
The USB keyboard/hub EVM is 4-inches L × 3.5-inches W and features the  
TPS2149 made by Texas Instruments. The TPS2149 is a power management  
devicethatintegratesanLDOandtwopowerswitchesintoonesmallpackage.  
Jumpers (0-resistors) and jumper blocks provided on the EVM are installed  
with the factory settings. The settings are described in Table 32. Review all  
setting changes prior to powering the EVM. Improper settings could result in  
damage to some of the EVM components. The factory settings allow the EVM  
2
to operate using a 12-MHz crystal along with an I C EEPROM. The EVM has  
also been configured to work only in bus-powered mode. The firmware  
installed at the factory and stored in the EEPROM will allow the EVM to  
functionasatwoportkeyboardhub. Usersareresponsiblefordevelopingtheir  
own application firmware for the target hardware device.  
The EVM also uses a TUSB2136, USB keyboard/hub controller, made by  
Texas Instruments, to communicate with the host and the downstream  
devices. A USB cable is needed to connect the root hub of the PC to the EVM  
type B connector (J5). The downstream devices connect to the EVM via the  
J6 and J7 connectors. These downstream devices are powered through the  
TPS2149. The USB specifications require that downstream ports remain off  
until enumeration is complete. Together, the TUSB2136 and the TPS2149  
ensure the hub meets this requirement. Two other connectors, J3 and J4,  
allow easy connection to the TUSB2136 general-purpose I/O lines. These  
lines can be used to implement the keyboard function.  
Jumpers, test points, and LEDs have been added for testing, troubleshooting  
and debugging purposes. Most of the test points are located near the  
TPS2149. There are also test points on the differential pair lines of the  
upstream B-type connector and the two downstream A-type connectors. The  
2
I C port can be probed directly on the EEPROM. Six LEDs are provided for  
quick feedback during firmware debugging or as status information. One LED  
(D1) is fixed to provide power and suspend status of the TUSB2136 device.  
2-1  
 
2-2  
 
Chapter 3  
EVM Operation  
Operation of the USB keyboard/hub EVM is summarized in paragraphs 3.1  
through 3.6.  
Topic  
Page  
3.1 TPS2149 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
3.2 Interfaces and USB Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
3.3 Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
3.4 Light-Emitting Diodes (LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
3.5 Jumpers and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
3.6 EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
3-1  
 
TPS2149 Setup  
3.1 TPS2149 Setup  
The USB keyboard/hub EVM is designed to allow evaluation of the TPS2149  
device. Test points and 0-resistors are provided to simplify the evaluation  
process (see Section 3.5). The EVM comes in a default configuration that  
requires no additional components, other than the required hardware and  
software identified in Section 1.1 of this users guide. For a complete  
description of the TPS2149 device, consult the TPS2149 data sheet (literature  
number SLVS401).  
3.2 Interfaces and USB Ports  
The EVM uses a standard Type-B connector for the upstream port and two  
single Type A connectors for the downstream ports. Power to the downstream  
ports is provided throught the TPS2149.  
Two edge connectors, J3 and J4, connect to the TUSB2136 general-purpose  
I/O lines. Out of 32 general-purpose I/O lines, 26 are brought out to the J3 and  
J4 connectors. The remaining 6 I/O lines are used onboard to control theLEDs  
(see Section 3.4).  
3.3 Power Supplies  
The USB keyboard/hub EVM requires no external power supply for operation.  
The EVM receives power via the USB cable. The TPS2149 low-dropout  
regulator is used to generate the required 3.3-V supply from the USB 5-V  
supply. The power indicator LED (D1) will turn on whenever power is available  
to the EVM (see Table 31).  
3.4 Light Emitting Diodes (LEDs)  
SeveralonboardLEDsareprovidedontheEVMforquickandeasyevaluation.  
A set of six green LEDs (D2 D7), connected to P3.0 through P3.5 of the  
TUSB2136, may be used for general purposes in any code that is written for  
the TUSB2136 (see Table 31). By default, the factory code provides the EVM  
with the use of only three of the LEDs as keyboard status indicators for Scroll  
Lock (D2), Caps Lock (D3), and Num Lock (D4). The other three are not used.  
Table 31.LED Description  
LED  
Description  
D2D7  
Green LED ON indicates corresponding GPIO pin is low (when D1 is ON).  
Green LED OFF indicates corresponding GPIO pin is high (when D1 is ON).  
D1  
Red LED ON indicates that the EVM is powered on and not suspended.  
Red LED OFF indicates that the EVM is powered off or suspended.  
3-2  
 
Jumpers and Test Points  
3.5 Jumpers and Test Points  
Table 32 describes the jumpers, J1 and J2, used to connect P3.0 and P3.1  
to D6 and D7 respectively, which should only be done when P3.0/S0 and  
P3.1/S1 are not set to GND for VID/PID selection (see the TUSB2136  
keyboard hub controller data sheet).  
Table 32 also describes the various 0-resistors used as jumpers. Test  
points are located throughout the EVM. For location of these test points,  
consult the layout in Section 5.  
Table 32.Jumpers and Test Points  
Jumpers  
Description  
J1  
J2  
Installed: connects P3.1 to D7  
Installed: connects P3.0 to D6  
0-resistors used to configure the TUSB2136. For proper operation with the firmware and  
EVM, R30, R31, and R33 are installed at the factory.  
R30 thru R35  
R29, R36, R37, R38 0-resistors on power lines which may be removed to insert a current meter.  
3.6 EEPROM  
The EEPROM is used for application-specific firmware. The TUSB2136 will  
2
automatically read the EEPROM at power up via the I C bus. A header must  
be added to the application firmware before loading into the EEPROM. This  
header format is specified in the bootcode document provided with the  
2
TUSB2136. The header may be generated automatically with the I C header  
generation utility software also provided with the TUSB2136.  
For convenience, the EEPROM has been installed on a socket. If desired, the  
socket may be removed and the EEPROM can be soldered directly onto the  
board. Using J3 and J4, the firmware installed at the factory will support a  
QWERTY keyboard with the matrix shown in Table 33.  
Table 33.QWERTY Keyboard Matrix  
Port  
No.  
P3.6  
P0.6  
P0.7  
P0.4  
P0.5  
P0.2  
COL 6  
P0.3  
COL 7  
P0.0  
P0.1  
P1.6  
Matrix  
COL 1 COL 2 COL 3 COL 4 COL 5  
COL 8 COL 9 COL 10  
P2.7 ROW 1  
P2.6 ROW 2  
P2.5 ROW 3  
P2.4 ROW 4  
P2.3 ROW 5  
P2.2 ROW 6  
P2.1 ROW 7  
P2.0 ROW 8  
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DEL  
0
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END  
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INS  
R
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ESC  
I
HOME  
R ARROW  
SPACE  
K
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U ARROW D ARROW  
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L ARROW  
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ENTER  
SHIFT  
ALT  
CTL  
EVM Operation  
3-3  
 
3-4  
 
Chapter 4  
Bill of Materials  
Table 41.EVM Bill of Materials  
Item Qty Ref. Des.  
Footprint  
MFR  
TI  
Part Number  
Description  
1
2
1
1
U1  
U2  
PKG_8P_DGK8  
PKG_5P_SOT23  
TPS2149  
3.3-V LDO and dual switch  
TI  
TPS77018DBVR  
LDO 1.8 V output  
IC, 2 PORT USB HUB with  
FUN CONTR, 64 pin  
3
4
1
4
U4  
TUSB2136PM  
1812  
TI  
TUSB2136PM  
FB1, FB2,  
FB3, FB4  
Mouser  
623-2743019447  
Ferrite bead  
C3, C5,  
C11C14,  
C17C20  
Capacitor, ceramic, 0.1-µF,  
50 V, X7R, 10%  
5
10  
C0805  
KEMET  
C0805C104K5RAC7800  
Capacitor, ceramic, 1.0-µF,  
6
1
4
2
2
1
2
1
1
6
1
2
2
4
C6  
C0805  
C0605  
C0605  
7343D  
Murata  
Murate  
Murata  
NEMCO  
GRM40X7R105K16PT  
GRM39C0G220J050AD  
GRM39C0G330J050AD  
LSR100/16DK125  
293D475X0010B2T  
AU-Y1005  
16 V, 20%  
Capacitor, ceramic, 22-pF,  
50 V, 5%  
7
C7C10  
C1, C2  
C15, C16  
C4  
Capacitor, ceramic,  
33 pF, 16 V, 20%  
8
Capacitor, tantalum,  
100 µF, 16 V, 20%  
9
Capacitor, tantalum,  
4.7 µF, 10 V, 20%  
10  
11  
12  
13  
14  
15  
16  
17  
18  
CAP_TANTALUM_B Sprague  
Connector, USB down-  
stream (Type A)  
J6, J7  
J5  
CONN_USB_A  
CONN_USB_B  
CRYSTAL_016695  
D-LTST-C170FKT  
D-LTST-C170UKT  
HEADER_1X2  
Digi-Key  
Digi-Key  
Crytek  
Liteon  
Connector, USB  
upstream (Type B)  
AU-Y1007  
Crystal, 12 MHz, 20 pF, ±50  
PPM at 25°C  
X1  
16695  
Diode, LED, green, 2.1 V,  
14.2-mcd, 20 Ma, 0805  
D2D7  
D1  
LTST-C170FKT  
LTST-C170UKT  
S1012-36-ND  
Diode, LED, red, 2.1 V,  
14.2-mcd, 20 Ma, 0805  
Liteon  
Header, 2 pin, 100 mil spac-  
ing, 36-pin strip  
J1, J2  
J3, J4  
Digi-Key  
Samtec  
Std  
Header, 2x7 RT ANG. pin,  
100 mil  
HEADER_2X7  
SSW-107-02-T-D-RA  
Std  
Resistor, chip, 15 k,  
1/10 W, 5%  
R9, R12R14 R0805  
4-1  
 
Table 41. EVM Bill of Materials (Continued)  
Item Qty Ref. Des.  
Footprint  
MFR  
Part Number  
Description  
Resistor, chip, 0 , 1/10 W,  
19  
20  
21  
22  
23  
10  
2
R29R38  
R15, R17  
R16, R25  
R24  
R0805  
Std  
Std  
5%  
Resistor, chip, 1 k,  
1/10 W, 5%  
R0805  
R0805  
R0805  
R0805  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Resistor, chip, 1.5 k,  
1/10 W, 5%  
2
Resistor, chip, 10 ,  
1/10 W, 5%  
1
Resistor, chip, 20 k,  
1/10 W, 5%  
2
R20, R21  
R10, R11,  
R18, R19,  
R22, R26  
Resistor, chip, 30 ,  
1/10 W, 5%  
24  
6
R0805  
Std  
Std  
Resistor, chip, 30.1 k,  
25  
26  
27  
28  
2
1
8
1
R27, R28  
R23  
R0805  
R0805  
R0805  
8 DIP  
Std  
Std  
1/10 W, 5%  
Resistor, chip, 200 k,  
1/10 W, 5%  
Std  
Std  
Resistor, chip, 511 ,  
1/10 W, 5%  
R1R8  
XU1  
Std  
Std  
IC serial EEPROM 8K x 8  
2.5 V  
Digi-Key  
24LC64P  
IC socket 8 pin MS Tin/  
Tin.300  
29  
30  
31  
32  
33  
1
XU1  
S1  
8 pin socket  
NC  
Digi-Key  
Digi-Key  
Farnell  
110-99-308-41-001  
P80075-ND  
1
Switch, 1P1T, 20 mA, 15 V  
Test pint, red, 1 mm  
TP7TP13,  
TP1525  
18  
1
TP_RED_1MM  
TP_BLACK_1MM  
SOT-23  
240-345  
TP14  
Q1  
Farnell  
240-333  
Test pint, black, 1 mm  
Bipolar, PNP, 40 V, 350 mA,  
zz W  
1
On Semi  
TR-MMBT3906LT1  
4-2  
 
Chapter 5  
EVM Layout  
Figure 51. TPS2149 Silk Screen  
5-1  
 
Figure 52. Schematic  
P 1 . 1  
P 1 . 0  
P 0 . 6  
P 0 . 7  
P 3 . 7  
P 3 . 6  
P 2 . 7  
P 2 . 6  
P 3 . 5  
P 3 . 4  
P 3 . 3  
P 3 . 2  
P 2 . 5  
P 2 . 4  
P 2 . 3  
P 2 . 2  
D G N D  
P 3 . 1  
P 3 . 0  
P 3 . 1 / S 1  
P 3 . 0 / S 0  
G N D  
X 2  
X 1  
V C C  
G N D  
P 2 . 1  
D G N D  
P 2 . 0  
C a s e  
S E L F / B U S  
G N D  
D M 0  
D P 0  
V +  
P o w e r  
1
2
D M  
D P  
D M 2  
D P 2  
3
4
P U R  
V  
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0  
0  
0  
0  
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R 3 5  
R 3 4  
R 3 3  
R 3 2  
R 3 1  
0  
R 3 0  
R 2 3  
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C a s e  
V  
D P  
4
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D M  
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D P  
3 0  
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1 5 k  
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R 1  
R 1 0  
R 9  
3
4
V  
C a s e  
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