參數(shù)資料
型號： TVP5031PFP
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： POWER, PLASTIC, TQFP-80
文件頁數(shù)： 68/92頁
文件大小： 415K
代理商： TVP5031PFP
2–54
2.11.43 TXF Filter 2 Parameters
Address
7
6
5
4
3
2
1
0
95h
Filter 2 Mask_1[3:0]
Filter 2 Pattern_1[3:0]
96h
Filter 3 Mask_2[3:0]
Filter 2 Pattern_2[3:0]
97h
Filter 2 Mask_3[3:0]
Filter 2 Pattern_3[3:0]
98h
Filter 2 Mask_4[3:0]
Filter 2 Pattern_4[3:0]
99h
Filter 2 Mask_5[3:0]
Filter 2 Pattern_5[3:0]
For an NABTS system, the packet prefix consists of five bytes: P1, P2, P3, CI and PS. Each byte contains four data
bits interlaced with four Hamming protection bits.
Pattern_1[3:0] corresponds to P1[7], P1[5], P1[3], P1[1]
(Packet address)
Pattern_2[3:0] corresponds to P2[7], P2[5], P2[3], P2[1]
(Packet address)
Pattern_3[3:0] corresponds to P3[7], P3[5], P3[3], P3[1]
(Packet address)
Pattern_4[3:0] corresponds to CI[7], CI[5], CI[3], CI[1]
(Continuity index)
Pattern_5[3:0] corresponds to PS[7], PS[5], PS[3], PS[1] (Packet structure)
For a WST system (PAL or NTSC), the magazine and row address group consists of two bytes. The two bytes contain
three bits of magazine number (M[2:0]) and 5 bits of row address (R[4:0]), interlaced with eight Hamming protection
bits.
Pattern_1[3:0] corresponds to R[0], M[2], M[1], M[0]
(Magazine and row LSB)
Pattern_2[3:0] corresponds to R[4], R[3], R2], R[1]
(Upper bits of row address)
Pattern_3[3:0] is ignored
Pattern_4[3:0] is ignored
Pattern_5[3:0] is ignored
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 TXF module should compare the LSB of nibble_1 in the pattern register to the first data bit
of the transaction. A 0 in the LSB of Mask_1 means that the TXF module should ignore the first data bit of the
transaction.
NOTE: The TXF Filter 2 parameters can only be written and read when both the Filter 1 enable
and the Filter 2 enable bits (in register 9Bh) are 0. When reading the values, the values must
be read consecutively, starting with the TXF Filter 1 parameters values.
These registers hold the search parameters for Filter 2. The parameters are used to parse the first five bytes of NABTS
Teletext transactions or the first two bytes if WST transactions. These bytes of teletext are expected to always contain
four data bits interlaced with four Hamming protection bits. The protection bits are ignored by the filter.
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