參數(shù)資料
型號(hào)： TVP5031
廠商： Texas Instruments, Inc.
英文描述： NTSC/PAL VIDEO DECODER
中文描述： NTSC / PAL視頻解碼器
文件頁(yè)數(shù)： 66/85頁(yè)
文件大?。?/td> 378K
代理商： TVP5031
2–50
2.11.33TXF Filter 1 Parameters
Address
90h
91h
92h
93h
94h
7
6
5
4
3
2
1
0
Filter 1 Mask_1[3:0]
Filter 1 Mask_2[3:0]
Filter 1 Mask_3[3:0]
Filter 1 Mask_4[3:0]
Filter 1 Mask_5[3:0]
Filter 1 Pattern_1[3:0]
Filter 1 Pattern_2[3:0]
Filter 1 Pattern_3[3:0]
Filter 1 Pattern_4[3:0]
Filter 1 Pattern_5[3:0]
For an NABTS system, the packet prefix consists of five bytes: P1, P2, P3, CI and PS. Each byte contains 4 data bits
interlaced with 4 Hamming protection bits.
Pattern_1[3:0] corresponds to P1[7], P1[5], P1[3], P1[1]
Pattern_2[3:0] corresponds to P2[7], P2[5], P2[3], P2[1]
Pattern_3[3:0] corresponds to P3[7], P3[5], P3[3], P3[1]
Pattern_4[3:0] corresponds to CI[7], CI[5], CI[3], CI[1]
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.
(Packet address)
(Packet address)
(Packet address)
(Continuity index)
Pattern_1[3:0] corresponds to R[0], M[2], M[1], M[0]
Pattern_2[3:0] corresponds to R[4], R[3], R2], R[1]
Pattern_3[3:0] is ignored
Pattern_4[3:0] is ignored
Pattern_5[3:0] is ignored
(Magazine and row LSB)
(Upper bits of row address)
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 1 parameters can only be written and read when both the Filter 1 enable
and the Filter 2 enable bits are 0. When reading the values, the values must be read
consecutively, starting with the first value.
These registers hold the search parameters for Filter 1. 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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