AL300 datasheet(56/64 Pages) ETC

56 / 64 page

AL300

November 28, 2001

0010

font address is multiple of 2

7 bytes

0011

font address is multiple of 2

8 bytes

0100

font address is multiple of 2

9 bytes

0101

font address is multiple of 2

10 bytes

0110

font address is multiple of 2

11 bytes

0111

font address is multiple of 2

12 bytes

1000

font address is multiple of 2

13 bytes

1001

font address is multiple of 2

14 bytes

1010

font address is multiple of 2

15 bytes

1011

font address is multiple of 2

16 bytes

RomStAddr2L <3:0> Bits<3:0> OSD2 ROM start address (Unit: 16 bytes)

Font address = (Character Code) * (Font Address Unit) + (OSD2 ROM Start Address)

‘Character Code’ is the data retrieved from internal OSD RAM.

‘Font Address Unit’ is defined by register #8Ah.

‘OSD2 ROM Start Address’ is defined by register #89h and #8Ah.

A0h:

OSD2 Horizontal Start (R/W) [OSDHSTART2]

OsdHStart2

<7:0> On Screen Display horizontal start position (Unit: 8 video pixels)

Relative to display HSYNC start

Please refer to OSD screen timing diagram (AL300-15) for additional reference.

A1h:

OSD2 Vertical Start (R/W) [OSDVSTART2]

OsdVStart2

<7:0> On Screen Display vertical start position (Unit: 8 video lines)

Relative to display VSYNC start

Please refer to OSD screen timing diagram (AL300-15) for additional reference.

A2h:

OSD2 RAM Start Address (R/W) [RAMADDRST2]

RamAddrSt2

<7:0> OSD2 RAM start address (Unit: 4 or 8 bytes)

OSD2 RAM Start Address =

1. Register A2h<7:0> * 4, if register 88h<6> = 0

2. Register A2h<7:0> * 8, if register 88h<6> = 1

AL300 has built in 1K Byte RAM

In RAM mode (register 80h<0> = 0):

RAM start address defines the start address of stored internal OSD RAM bitmap.

In ROM mode (register 80h<0> = 1):

RAM start address defines the start address of OSD ROM font character codes

retrieved from internal OSD RAM.

font address = (Character Code) * (Font Address Unit) + (OSD2 ROM Start Address)

Where

‘Character Code’ is the data retrieved from internal OSD RAM.

‘Font Address Unit’ is defined by register #8Ah.

‘OSD2 ROM Start Address’ is defined by register #89h.

A3h:

OSD2 RAM Horizontal Stride Low (R/W) [RAMSTRIDE2]

RamStride2L

<7:0> Bits<7:0> of OSD2 RAM line stride (Unit: 1 bytes)

In RAM mode (register 80h<0> = 0):

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