Texas Instruments TFT Data Mapping for Dual Pixel LDI Application - Alternate A - Color Map Application Note

DS90C3201,DS90C3202,DS90C363B,DS90C365A,

DS90C383B,DS90C385A,DS90C387,DS90C387A,

DS90C387R,DS90CF363B,DS90CF364,

DS90CF364A,DS90CF366,DS90CF383B,

DS90CF384,DS90CF384A,DS90CF384AQ,

DS90CF386,DS90CF388,DS90CF388A,DS90CF564

Application Note 1163 TFT Data Mapping for Dual Pixel LDI Application -

Alternate A - Color Map

Literature Number: SNLA015

TFT Data Mapping for Dual

Pixel LDI Application -

Alternate A - Color Map

National Semiconductor

Application Note 1163

February 2000

INTRODUCTION

The purpose of this application note is to provide the data mapping information for an 8-bit color dual pixel application using the DS90C387 (LDI Transmitter) to the DS90CF388

(LDI Receiver). This is an alternate color mapping scheme and differs from the Open LDI color data mapping. (See

AN-1127 for information on Open LDI color mapping).

The tables below show the connections needed when using the LDI chipset (DS90C387 / DS90CF388) with this color mapping.

Names (R, G, B). Note that these are ODD and EVEN (Dual

Pixel Application) and are designated with an ’O’ and ’E’ respectively. Transmitter pins are listed by the DS90C387 ’pin name’ and pin number. The output signals of the receiver are mirror images of the input signals to the transmitter. These are also listed by the respective pin name and pin number.

The last column repeats the TFT Data Signal color designation. Color Data is provided in Table 1 and Control Bits are listed in Table 2.

HOW TO READ THE TABLE

Table 1 is read from left to right. The first column notes the

LSB (least significant bit) and MSB (most significant bit) color bit designations. Next are the VGA-TFT Color Bit

TABLE 1. 8-Bit Dual Pixel per Clock Input Application

VGA — TFT Data Signal

LSB/MSB

Color Bit

LSB

MSB

LSB

MSB

LSB

MSB

GO5

GO6

GO7

BO0

BO1

BO2

BO3

BO4

BO5

BO6

BO7

RO5

RO6

RO7

GO0

GO1

GO2

GO3

GO4

RO0

RO1

RO2

RO3

RO4

DS90C387

Pin Name

(Pin Number)

R10 (10)

R11 (9)

R12 (8)

R13 (7)

R14 (6)

R15 (5)

R16 (4)

R17 (3)

G10 (2)

G11 (1)

G12 (100)

G13 (99)

G14 (96)

G15 (95)

G16 (94)

G17 (93)

B10 (92)

B11 (91)

B12 (90)

B13 (89)

B14 (88)

B15 (87)

B16 (86)

B17 (85)

DS90CF388

Pin Name

(Pin Number)

R10 (8)

R11 (9)

R12 (10)

R13 (11)

R14 (12)

R15 (14)

R16 (15)

R17 (17)

G10 (18)

G11 (19)

G12 (20)

G13 (21)

G14 (22)

G15 (24)

G16 (26)

G17 (27)

B10 (28)

B11 (29)

B12 (30)

B13 (31)

B14 (32)

B15 (34)

B16 (36)

B17 (37)

TFT Data Signal

8 Bit Color, Dual Pixel

GO5

GO6

GO7

BO0

BO1

BO2

BO3

BO4

BO5

BO6

BO7

RO5

RO6

RO7

GO0

GO1

GO2

GO3

GO4

RO0

RO1

RO2

RO3

RO4

© 2000 National Semiconductor Corporation AN101314 www.national.com

TABLE 1. 8-Bit Dual Pixel per Clock Input Application (Continued)

VGA — TFT Data Signal

LSB/MSB

Color Bit

LSB

MSB

LSB

MSB

LSB

MSB

GE0

GE1

GE2

GE3

GE4

GE5

GE6

GE7

RE0

RE1

RE2

RE3

RE4

RE5

RE6

RE7

BE0

BE1

BE2

BE3

BE4

BE5

BE6

BE7

Note: O = Odd (First) Pixel, E = Even (Second) Pixel

DS90C387

Pin Name

(Pin Number)

R20 (84)

R21 (81)

R22 (80)

R23 (79)

R24 (78)

R25 (77)

R26 (76)

R27 (75)

G20 (74)

G21 (73)

G22 (72)

G23 (71)

G24 (70)

G25 (69)

G26 (66)

G27 (65)

B20 (64)

B21 (63)

B22 (62)

B23 (61)

B24 (60)

B25 (59)

B26 (58)

B27 (57)

TABLE 2. TFT Control Data Signal and CLK

DS90CF388

Pin Name

(Pin Number)

R20 (38)

R21 (39)

R22 (40)

R23 (41)

R24 (43)

R25 (46)

R26 (47)

R27 (48)

G20 (49)

G21 (50)

G22 (51)

G23 (52)

G24 (53)

G25 (55)

G26 (57)

G27 (58)

B20 (59)

B21 (60)

B22 (61)

B23 (62)

B24 (64)

B25 (65)

B26 (67)

B27 (68)

TFT Data Signal

8 Bit Color, Dual Pixel

GE0

GE1

GE2

GE3

GE4

GE5

GE6

GE7

RE0

RE1

RE2

RE3

RE4

RE5

RE6

RE7

BE0

BE1

BE2

BE3

BE4

BE5

BE6

BE7

Control Signal

HSYNC

VSYNC

DEN

CLK

VGA — TFT

DS90C387

Pin Name

(Pin Number)

HSYNC (54)

VSYNC (55)

DE (56)

CLKIN (11)

DS90CF388

Pin Name

(Pin Number)

HSYNC (71)

VSYNC (70)

DE (69)

CLKOUT (42)

TFT Control Signal

HSYNC

VSYNC

DEN

CLK

SUMMARY

This color mapping provides the necessary information to connect graphic cards to existing panels using this color mapping. The ’ALT A’ color map documented in this application note provides connection information to the respective

DS90C387/DS90CF388 LDI chipset Pin Names / Pin Numbers. A careful review of this information is recommended as there is not a standardized color naming convention between 6 bit and 8 bit color data with regard to LSB and MSB designations.

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