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Display Subsystem Basic Programming Model
Pixel Clock = (FunctionalClock/LCD[7:0])/PCD[7:0]
through
show the pixel clock frequency limitations depending the panel type (active
or passive matrix) and the mode (color or monochrome).
Table 7-59. Pixel Clock Frequency Limitations - RGB16 and YUV4:2:2 Active Matrix Display
Min PCD Values
Horizontal Resampling
Off
Up
1:1 - 1:2
1:2 - 1:3
1:3 - 1:4
Vertical
Off
2 (1)
(1)
2
(1)
2
3
4
Resampling
Up
2
(1)
2 (1)
(1)
2
3
4
1:1 - 1:2
3-tap
2
2
4
6
8
5-tap
PCDmin
PCDmin
PCDmin
PCDmin
PCDmin
1:2 - 1:4
PCDmin
PCDmin
PCDmin
PCDmin
PCDmin
(1)
The PCD value can be 1 in case all the data and synchronization signals are asserted and deasserted on the rising edge of the
pixel clock.
Table 7-60. Pixel Clock Frequency Limitations - RGB16 and YUV4:2:2 Passive Matrix Display -
Mono4
Min PCD Values
Horizontal Resampling
Off
Up
1:1 - 1:2
1:2 - 1:3
1:3 - 1:4
Vertical
Off
4
4
8
12
16
Resampling
Up
4
4
8
12
16
1:1 - 1:2
3-tap
8
8
16
24
32
5-tap
4xPCDmin
4xPCDmin
4xPCDmin
4xPCDmin
4xPCDmin
1:2 - 1:4
4xPCDmin
4xPCDmin
4xPCDmin
4xPCDmin
4xPCDmin
Table 7-61. Pixel Clock Frequency Limitations - RGB16 and YUV4:2:2 Passive Matrix Display -
Mono8
Min PCD Values
Horizontal Resampling
Off
Up
1:1 - 1:2
1:2 - 1:3
1:3 - 1:4
Vertical
Off
8
8
16
24
32
Resampling
Up
8
8
16
24
32
1:1 - 1:2
3-tap
16
16
32
48
64
5-tap
8xPCDmin
8xPCDmin
4xPCDmin
8xPCDmin
8xPCDmin
1:2 - 1:4
8xPCDmin
8xPCDmin
4xPCDmin
8xPCDmin
8xPCDmin
Table 7-62. Pixel Clock Frequency Limitations - RGB16 and YUV4:2:2 Passive Matrix Display -
Color
Min PCD Values
Horizontal Resampling
Off
Up
1:1 - 1:2
1:2 - 1:3
1:3 - 1:4
Vertical
Off
3
3
6
9
12
Resampling
Up
3
3
6
9
12
1:1 - 1:2
3-tap
6
6
12
18
24
5-tap
3xPCDmin
3xPCDmin
3xPCDmin
3xPCDmin
3xPCDmin
1:2 - 1:4
3xPCDmin
3xPCDmin
3xPCDmin
3xPCDmin
3xPCDmin
NOTE:
In case of RGB24 format,
is still valid, except the PCDmin values which must
be multiplied by two.
The PCDmin for vertical downsampling only is defined by the following equations:
1731
SWPU177N – December 2009 – Revised November 2010
Display Subsystem
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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