Texas Instruments TVP5147M1PFP manual VDP FIFO Word Count Register, 19. Teletext Filter Function

Models: TVP5147M1PFP

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Figure 2−19. Teletext Filter Function

Functional Description

1P1[3]

 

 

D1[3]

1M1[3]

 

1P1[2]

 

 

 

D1[2]

1M1[2]

 

1P1[1]

 

 

 

D1[1]

1M1[1]

 

 

 

1P1[0]

 

 

D1[0]

1M1[0]

 

 

 

 

NIBBLE 1

 

D2[3:0]

 

 

1P2[3:0]

NIBBLE 2

 

1M2[3:0]

 

 

 

 

PASS 1

D3[3:0]

 

Filter 1

1P3[3:0]

NIBBLE 3

Enable

1M3[3:0]

 

 

 

D4[3:0]

 

 

1P4[3:0]

NIBBLE 4

 

1M4[3:0]

 

 

D5[3:0]

 

 

1P5[3:0]

NIBBLE 5

 

1M5[3:0]

 

 

 

 

FILTER 1

D1..D5

 

PASS 2

2P1..2P5

 

 

FILTER 2

2M1..2M5

 

Filter 2

 

 

Enable

00

01

PASS

10

11

2.11.68 VDP FIFO Word Count Register 2

Filter Logic

Figure 2−19. Teletext Filter Function

2.11.68 VDP FIFO Word Count Register

Subaddress

BCh

Read only

7

6

5

4

3

2

1

0

FIFO word count [7:0]

FIFO word count [7:0]: This register provides the number of words in the FIFO.

NOTE: 1 word equals 2 bytes.

SLES140A—March 2007

TVP5147M1PFP

63

Page 71
Image 71
Texas Instruments TVP5147M1PFP manual VDP FIFO Word Count Register, 19. Teletext Filter Function