Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 40

• Manufacturer Part Number: Z90251
• Description: eZVision 200 Television Controllers with OSD
• Manufacturer: ZILOG [Zilog, Inc.]

Bit 7, Halftone Output Delay on P20, is the amount of time that output of the
halftone signal is delayed to compensate for the amount of delay of OSD RGB
from external circuitries.
Bits 6, 5, and 4, Mesh Color, define the color of the mesh window. The colors are
specified in Blue, Green, Red order, as shown in Table 17.
Bit/
Field
Halftone Effect Output
Delay on P20
Mesh Color
P20 for
Halftoning
Software Field Number/
Polarity of Halftone
Effect Output
Software Mesh
Mesh Enable
When working with Progressive mode, mesh does not work the
same way as in Interlace mode.
Bit
Position R/W
7
6, 5, 4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
Value
32 KB Television Controller with OSD
00/0
00/1
01/0
01/1
10/0
10/1
11/0
11/1
xx/x
0
1
0
1
0
1
0
1
Description
Bits 5, 4 in ROW_SPACE/ bit 7
No Delay
Delay by 0.5 Dot-Clock Period
Delay by 1.0 Dot-Clock Period
Delay by 1.5 Dot-Clock Period
Delay by 2.0 Dot-Clock Period
Delay by 2.5 Dot-Clock Period
Delay by 3.0 Dot-Clock Period
Delay by 3.5 Dot-Clock Period
Defines the mesh color.
B,G,R respectively.
Normal Mesh effect
Use P20 Output for Halftoning
Even Field/Positive Halftone Effect
Output
Odd Field/Negative Halftone Effect
Output
Hardware Defines Field Number
Software Defined Field Number
Mesh is Disabled
Mesh is Enabled
PS001301-0800
32