參數(shù)資料
型號: TVP5146M1PFP
廠商: TEXAS INSTRUMENTS INC
元件分類: 顏色信號轉換
英文描述: COLOR SIGNAL DECODER, PQFP80
封裝: POWERPAD, PLASTIC, QFP-80
文件頁數(shù): 74/104頁
文件大?。?/td> 593K
代理商: TVP5146M1PFP
255
2.11.63 VDP TTX Filter And Mask Registers
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 4 data bits (D[3:0]) interlaced with
4 Hamming protection bits (H[3:0]):
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
D3
H3
D2
H2
D1
H1
D0
H0
Only 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] (see Figure 227). The filter ignores the Hamming protection bits.
For 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
R0
H3
M2
H2
M1
H1
M0
H0
R4
H7
R3
H6
R2
H5
R1
H4
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 mask bit 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).
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