Texas Instruments TVP5147M1PFP manual VDP Pixel Alignment Register, VDP Line Start Register

Models: TVP5147M1PFP

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2.11.73 VDP Pixel Alignment Register

Functional Description

2.11.73 VDP Pixel Alignment Register

Subaddress

C2h−C3h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

01Eh

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Subaddress

 

7

 

6

5

 

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

C2h

 

 

 

 

 

 

Pixel alignment [7:0]

 

 

 

 

 

 

 

 

 

 

 

 

 

C3h

 

 

 

 

 

Reserved

 

 

Pixel alignment [9:8]

Pixel alignment [9:8]: These registers form a 10-bit horizontal pixel position from the falling edge of horizontal sync, where the VDP controller initiates the program from one line standard to the next line standard, for example, the previous line of teletext to the next line of closed caption. This value must be set so that the switch occurs after the previous transaction has cleared the delay in the VDP, but early enough to allow the new values to be programmed before the current settings are required.

The default value is 0x1E and has been tested with every standard supported here. A new value is needed only if a custom standard is in use.

2.11.74 VDP Line Start Register

Subaddress

D6h

 

 

Default

06h

7

6

5

4

3

2

1

0

VDP line start [7:0]

VDP line start [7:0]: Set the VDP line starting address

This register must be set properly before enabling the line mode registers. The VDP processor works only the VBI region set by this register and the VDP line stop register.

2.11.75 VDP Line Stop Register

Subaddress

D7h

 

 

Default

1Bh

7

6

5

4

3

2

1

0

VDP line stop [7:0]

VDP line stop [7:0]: Set the VDP stop line address

2.11.76 VDP Global Line Mode Register

Subaddress

D8h

 

 

Default

FFh

7

6

5

4

3

2

1

0

Global line mode [7:0]

Global line mode [7:0]: VDP processing for multiple lines set by the VDP start line register at subaddress D6h and the VDP stop line register at subaddress D7h.

Global line mode register has the same bit definition as the general line mode registers. General line mode has priority over the global line mode.

SLES140A—March 2007

TVP5147M1PFP

65

Page 73
Image 73
Texas Instruments TVP5147M1PFP manual VDP Pixel Alignment Register, VDP Line Start Register, VDP Line Stop Register