Exar XRD9829REF Manuale utente

EXARCorporation,48720KatoRoad,Fremont,CA94538•(510)668-7000•FAX(510)668-7017

July 1998-2

XRD9829REF

USER MANUAL

CIS 30-BIT COLOR SINGLE LINE SCANNER

XRD9829REF

Rev.1.00

EVALUATIONKIT PART LIST

This kit contains the following:

• XRD9829REFCIS30-BitColorSingleLineScanner

• XRD9829REFUserManual

• ScanIt 1.0 Software Installation Diskettes (2)

• XRD9829DataSheet

• Scan Targets (Black, White, Color)

FEATURES

• One line scanning functionality of XRD9829 with CANON 300 DPI CIS

• Easy use with most personal computers through Parallel Port Interface

• Simple way of loading the Serial Port of XRD9829 to adjust gain and offset

• Software ScanIt to view single line scan

• OptimizedLayout withFour Layers

SYSTEMREQUIREMENTS

• Intel486 compatible computerwith Windows 95 operating system

• 8 MBytes system memory

• 25-pinD-shapeparallelportreceptacles

• 3 1/2” floppy disk drive

INTRODUCTION

The XRD9829REF is a demo system which includes a PCB design with a CANON CWB-

30216G 300 DPI Color Contact Image Sensor (CIS). It demonstrates how to interface a CIS

withEXAR’sXRD9829,a10-bitLinearCIS/CCDSensorSignalProcessortogetasingleline

scan.TheXRD9829REF isdesignedto provideasignal pathforthe CIS outputsignals to be

processed, digitized by the XRD9829 and transmitted to a personal computer. There are no

softwarealgorithmsorhardwareimplementations toadjustfortruecolorresponse.

TheXRD9829REFboardisloadedwiththeXRD9829,aVantisMACH435,twoFIFOSRAMs

and peripheral circuits for the CIS. The MACH435, which is a CMOS Programmable Logic

Device (CPLD) provides timing signals to the XRD9829, the SRAMs and the CIS. It also

programsthe XRD9829 to operate inthe correct mode and adjustfor gain and offset values.

TheXRD9829processestheanalogoutputfromtheCISsensor,level-shiftsandconvertsthe

signalintodigitalcodes.TheSRAMsgatethedigitizeddatafromtheXRD9829andstoresthe

datatemporarily.Controlledbythesoftware,theSRAMssendthedatathroughaparallelport

connectiontothePCandhistogramsofrawdataaredisplayedinthemonitorusingtheScanIt

software. A block diagram of the XRD9829REF is shown below in Figure 1.

XRD9829REF

Rev.1.00

FLIP-

FLOP

CANON CWB-30216G 300DPI COLOR CIS

XRD9829

FLIP-

FLOP FIFO

SRAM

FIFO

SRAM

INTEL 486 Compatible

PARALLEL

PORT DB25

CONNECTOR

CIS CONTROL SIGNALS

DATA

5-BIT BUS NIBBLE

XRD9829 CONTROL SIGNALS

PARALLEL PORT CONTROL

1.25V

MACH435 CPLD

CIS OUTPUT

Figure 1. Block Diagram of XRD9829REF

TheXRD9829isacompletelinearCISorCCDsensorsignalprocessoronasinglemonolithic

chip. TheXRD9829includesahighspeed10-BitADC,a6-BitProgrammableGainAmplifier

withgainadjustmentof1to10andan8-Bitprogrammableinputreferredoffsetcalibrationrange

of 800 mV. See the XRD9829EVAL User Manual / PCB board for evaluating the XRD9829

CIS / CCD signal processor chip.

XRD9829REF

Rev.1.00

OPERATIONALPROCEDURE

Theroutinelistedbelowwillfirst calibrate thephotoresponseoftheCIS using theXRD9829.

Aftercalibration,theXRD9829REFcanbeusedtoscananycolortargettoshowCISnon-color

corrected response. (Color correction is typically done in the digital asic.)

HowtoRuntheXRD9829REFDemonstration:

1. Makesurethecomputer is poweredoffandtheACpoweradapteris disconnected froma

walloutlet

2. Connect the parallel port cable to the printer port of the computer

3. Connectthe AC power adapter into a wall outlet

4. Turnonthe computer and activateWindows 95

LoadingEXARSoftware

5. Load the diskette labeled ScanIt 1.0 Disk # 1 into the floppy drive

6. SelecttheStart menu inthe program manager and chooseRUN

7. Inside the small pop-up window, type: A:\setup

8. Follow the instructions to finish software installation

CLP

VIN0

VIN1

VIN2

VIN3

VREF+

DB4:0 / DB9:5

DVDD

PDB

DGND

AVDD

AGND

ADCCLK

PGA

CONTROL LOGIC

AVDD

6-BIT GAIN

10-BIT

ADC

AGND

DATA

OUT

PORT

BUFFER

VRT

VRB

4-1

MUX

8-BIT DAC

10 5

8-BIT OFFSET

AGND

DCEXT

SCLK

SDATA

DCREF

DC/AC

MUX SEL

INT/EXT_V

DCREF

CIS/CCD

G<5:0>

O<7:0>

VRT

CCD

CIS

Power

Down

Power

Down

Figure 2. Functional Block Diagram of XRD9829

XRD9829REF

Rev.1.00

ParallelPortConfigurations

9. Confirm the parallel port address as follows:

a. Select the Start Menu, choose Settings, then choose Control Panel

b. From the Control Panel window which pops up, double-click on System

c. In the System Properties window, select Device Manager

d. Fromthe DeviceManager window, double-click on Ports (COM & LPT)

e. Double-click on Printer Port (LPT1). If you can not find it, please goto Step 10

f. Fromthepop-upwindow,selectResources

g. Verify the Input/Output Range is set to 0378 - 037F

h. If the range is not correct, clear the Use Automatic Settings check box by

clicking it

i. Choose correct address which is 0378 by default and click OK

j. Re-start the computer as advised

10. If you do not have a Printer Port configured on your computer, please follow the steps

listedbelow:

a. FromtheControlPanelwindowwhichpopsup,double-clickonAddNewHardware

b. From the pop-up window, click the Next > button

c. Select ‘No’ when prompted for ‘Do you want Windows to search for your new

hardware?’, then click the Next > button

d. Choose Ports (COM & LPT), then click the Next > button

e. Choose Printer Port, then click the Next > button

f. Make a note of the Input/Output Range of Printer Port of your computer and click

OK.

g. You will use these values later when configure the ScanIt software

h. Re-start the computer as advised

OffsetAdjustmentWithaBlackTarget

11. Set the dip switches located on the side panel of the scanner to 1100010000 as shown

in Figure 2 and push the Serial Port button which is located on the front panel of the

demo system. This will reset the XRD9829.

XRD9829REF

Rev.1.00

Figure3.DipSwitches Set to Value 1100010000 to ResettheXRD9829

XRD9829REF

Rev.1.00

ControlRegisters

Function D7 D6 D5 D4 D3 D2 D1 D0 Power-up

(Register State

S1/S0) (Note1)

Gain

(00) G5 G4 G3 G2 G1 G0 X X 000000XX

(MSB) (LSB)

Offset O7 O6 O5 O4 O3 O2 O1 O0 01000000

(01) (MSB) (LSB)

Mode XX V

RT INPUTDC DC/AC CIS/CCD MUXSEL MUXSEL XX000000

(10) 0:INTERNAL REFERENCE 0: DC 0: CIS

1:EXTERNAL (VDCREF) 1: AC 1:CCD

0:INTERNAL 0 0: VIN0 0 0: VIN0

(VDCREF= 0 1: VIN1 0 1: VIN1

AGND) 1 0: VIN2 1 0: VIN2

1:EXTERNAL 1 1: VIN3 1 1: VIN3

(VDCREF=VDCEXT)

Mode

&Test

(11) X X X DIGITALRESET TEST3 TEST2 TEST1 X XXX0000X

0:NORESET 0:TEST3 0:TEST2 0:TEST1

1:RESET DISABLED DISABLED DISABLED

(REGISTERSARE 1:OUTPUT 1:OUTPUT 1: VIN1 PIN

RESETTO OFBUFFER OFPGA TIEDTO

POWER-UP TIEDTOVIN3 TIEDTO INPUTOF

STATES) PIN (VIN3 PIN VIN2PIN ADC

BECOMES (VIN2PIN (PGAOUTPUT

ANOUTPUT) BECOMES DISCONNECTED

ANOUTPUT) FROMINPUT

OFADC)

Table1. ControlRegister Description for XRD9829

Note:

These are the control register settings upon initial power–up. The previous register settings are retained following

logic power-down initiated by the PDB signal.

XRD9829REF

Rev.1.00

12. Select the Start Menu, choose Programs, then choose XRD9829REF icon

13. A window will pop up as shown below. The upper window shows the Plot of Captured

Data and the lower window shows the Histogram of data. Figure 3 shows the pop-

up window when ScanIt is first

started.

Figure 4. ScanIt Software Window Before Scanning

14. Select SETUP from the pull-down menu and choose I/O ADDRESS. In the window

thatpops up, type in the Input/Output Range of Printer Port of your computer. The

default setting is 378H.

XRD9829REF

Rev.1.00

15. Pick the black target out from the kit and put it on a flat area. Place the XRD9829REF

on top of the black target with the CIS sensor facing downwards. From the CAPTURE

menu select SNAP SHOT for a single line scan of the black target with the dip

switches set to zero. A typical result of a black target scan is shown below:

Figure 5.Non-calibrated Black Target Scan

16. Set the dip switches to 1000010000 to select the external DC reference for the 1.25V

global offset adjustment. Push the Serial Port button. The XRD9829 will subtract

whatever voltage appears on Pin 16, in this case, 1.25V, from the input. From the

CAPTURE menu select SNAP SHOT. A typical result of the global offset adjustment

is shown below. Please notice that the black code value has moved down.

XRD9829REF

Rev.1.00

Figure6.BlackTargetScanAfterGlobalOffsetAdjust

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