Xilinx ML561 manual Table C-4Resistor Value Settings, Table C-5 Reference Voltage Parameters

Models: ML561

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Hardware Schematic Diagram

After the SHL bit is configured, these settings normally are not changed.

Select the LCD bias settings.

The duty cycle is selected as 1/65 by hardwiring the controller IC pads on the display PCB.

The LCD bias is set to:

-1/7: when the BIAS bit is 0

-1/9: when the BIAS bit is 1

The following steps are performed next:

Start the onboard converter, regulator, and follower

Set the regulator resistor values (see Table C-4)

Configure the reference voltage register parameters (see Table C-5)

Table C-4:Resistor Value Settings

 

 

 

 

3-Bit Data Settings (R2 R1 R0)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

000

001

010

011

 

100

101

110

111

 

 

 

 

 

 

 

 

 

 

 

 

 

1+(Rb/Ra)

1.90

2.19

2.55

3.02

 

3.61

4.35

5.29

6.48

 

 

 

 

 

 

 

 

 

 

 

 

 

Table C-5:Reference Voltage Parameters

 

 

 

 

 

 

 

 

 

 

 

 

 

SV5

SV4

SV3

SV2

SV1

SV0

 

Reference Voltage Parameter (α)

 

 

 

 

 

 

 

 

 

 

 

 

0

0

0

0

0

0

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

0

0

0

0

1

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

..

..

..

..

..

 

 

 

..

 

 

..

..

..

..

..

..

 

 

 

..

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

1

1

1

0

 

 

 

62

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

1

1

1

1

 

 

 

63

 

 

 

 

 

 

 

 

 

 

 

 

 

 

At startup of the LCD controller (after RESETB operation), the resistor and reference voltage values are:

Resistor selection is: 0,0,0

Reference voltage is: 1,0,0,0,0,0

The resistor selection value MUST be set to 101b when using this LCD panel.

After the display is brought to operational mode, it is best to wait at least 1 ms to ensure the stabilization of power supply levels. After this time, all other necessary display initializations can be performed.

Virtex-5 FPGA ML561 User Guide

www.xilinx.com

129

UG199 (v1.2) April 19, 2008

Page 129
Image 129
Xilinx ML561 manual Table C-4Resistor Value Settings, Table C-5 Reference Voltage Parameters, Reference Voltage Parameter α