參數(shù)資料
型號： TVP5146M2IPFP
廠商： TEXAS INSTRUMENTS INC
元件分類： 顏色信號轉(zhuǎn)換
英文描述： COLOR SIGNAL DECODER, PQFP80
封裝： GREEN, PLASTIC, HTQFP-80
文件頁數(shù)： 80/107頁
文件大?。?/td> 949K
代理商： TVP5146M2IPFP
SLES141G
– JULY 2005 – REVISED APRIL 2011
Table 2-88. AGC Decrement Delay Register
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 2-89. VDP TTX Filter and Mask Register
Subaddress
B1h
B2h
B3h
B4h
B5h
B6h
B7h
B8h
B9h
BAh
Default
00h
Subaddress
7
6
5
4
3
2
1
0
B1h
Filter 1 Mask 1
Filter 1 Pattern 1
B2h
Filter 1 Mask 2
Filter 1 Pattern 2
B3h
Filter 1 Mask 3
Filter 1 Pattern 3
B4h
Filter 1 Mask 4
Filter 1 Pattern 4
B5h
Filter 1 Mask 5
Filter 1 Pattern 5
B6h
Filter 2 Mask 1
Filter 2 Pattern 1
B7h
Filter 2 Mask 2
Filter 2 Pattern 2
B8h
Filter 2 Mask 3
Filter 2 Pattern 3
B9h
Filter 2 Mask 4
Filter 2 Pattern 4
BAh
Filter 2 Mask 5
Filter 2 Pattern 5
For an NABTS system, the packet prefix consists of five bytes. Each byte contains four data bits (D[3:0]) interlaced with four Hamming
protection bits (H[3:0]):
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
D[3]
H[3]
D[2]
H[2]
D[1]
H[1]
D[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
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R[0]
H[3]
M[2]
H[2]
M[1]
H[1]
M[0]
H[0]
R[4]
H[7]
R[3]
H[6]
R[2]
H[5]
R[1]
H[4]
The mask bits enable filtering using the corresponding bit in the pattern register. For example, a 1 in the LSB of mask 1 means that the filter
module must 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 0 in a bit of mask means that the filter module must ignore that data bit of the transaction. If all 0s are programmed in the mask
bits, then the filter matches all patterns returning a true result (default 00h).
74
Functional Description
Copyright
2005–2011, Texas Instruments Incorporated
Product Folder Link(s): TVP5146M2
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