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Functional Description
62
SLES140A—March 2007TVP5147M1PFP
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.