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67 vdp ttx filter control register – Texas Instruments TVP5147M1PFP User Manual

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Functional Description

62

SLES140A—March 2007

TVP5147M1PFP

2.11.67 VDP TTX Filter Control Register

Subaddress

BBh

Default

00h

7

6

5

4

3

2

1

0

Reserved

Filter logic [1:0]

Mode

TTX filter 2 enable

TTX filter 1 enable

Filter logic [1:0]: Allow different logic to be applied when combining the decision of filter 1 and filter 2 as follows:

00 = NOR (default)
01 = NAND
10 = OR
11 = AND

Mode: indicates which teletext mode is in use.

0 = Teletext filter applies to 2 header bytes (default)
1 = Teletext filter applies to 5 header bytes

TTX filter 2 enable: provides for enabling the teletext filter function within the VDP.

0 = Disabled (default)
1 = Enabled

TTX filter 1 enable: provides for enabling the teletext filter function within the VDP.

0 = Disabled (default)
1 = Enabled

If the filter matches or if the filter mask is all 0s, then a true result is returned.