TVP5160
SLES135E–FEBRUARY 2005–REVISED APRIL 2011
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Table 3-109. AGC Decrement Delay
Subaddress 9Eh
Default
1Eh
7
6
5
4
3
2
1
0
AGC decrement delay [7:0]
AGC decrement delay: Number of frames to delay gain decrements
1111 1111 = 255
0001 1110 = 30 (default)
0000 0000 = 0
Table 3-110. VDP TTX Filter and Mask
Subaddress B1h
B2h
00h
B3h
00h
B4h
00h
B5h
00h
B6h
00h
B7h
00h
B8h
00h
B9h
00h
BAh
00h
Default
00h
Subaddress
B1h
7
6
5
4
3
2
1
0
Filter 1 Mask 1
Filter 1 Mask 2
Filter 1 Mask 3
Filter 1 Mask 4
Filter 1 Mask 5
Filter 2 Mask 1
Filter 2 Mask 2
Filter 2 Mask 3
Filter 2 Mask 4
Filter 2 Mask 5
Filter 1 Pattern 1
Filter 1 Pattern 2
Filter 1 Pattern 3
Filter 1 Pattern 4
Filter 1 Pattern 5
Filter 2 Pattern 1
Filter 2 Pattern 2
Filter 2 Pattern 3
Filter 2 Pattern 4
Filter 2 Pattern 5
B2h
B3h
B4h
B5h
B6h
B7h
B8h
B9h
BAh
For an NABTS system, the packet prefix consists of five bytes. Each byte contains 4 data bits (D[3:0]) interlaced with 4 Hamming protection
bits (H[3:0]):
Bit 7
D[3]
Bit 6
H[3]
Bit 5
D[2]
Bit 4
H[2]
Bit 3
D[1]
Bit 2
H[1]
Bit 1
D[0]
Bit 0
H[0]
Only the data portion D[3:0] from each byte is applied to a teletext filter function with corresponding pattern bits P[3:0] and mask bits M[3:0].
The filter ignores hamming protection bits.
For a WST system (PAL or NTSC), the packet prefix consists of two bytes. The two bytes contain three bits of magazine number (M[2:0])
and five bits of row address (R[4:0]), interlaced with eight Hamming protection bits H[7:0]:
Bit 7
R[0]
R[4]
Bit 6
H[3]
H[7]
Bit 5
M[2]
R[3]
Bit 4
H[2]
H[6]
Bit 3
M[1]
R[2]
Bit 2
H[1]
H[5]
Bit 1
M[0]
R[1]
Bit 0
H[0]
H[4]
The mask bits enable filtering using the corresponding bit in the pattern register. For example, a 1b in the LSB of mask 1 means that the
filter module should compare the LSB of nibble 1 in the pattern register to the first data bit on the transaction. If these match, then a true
result is returned. A 0b in a mask bit means that the filter module should ignore that data bit of the transaction. If all 0s are programmed in
the mask bits, the filter matches all patterns returning a true result (default 00h).
78
Internal Control Registers
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