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參數資料
| 型號： | TFP6424PAP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, THERMALLY ENHANCED, POWER, PLASTIC, TQFP-64 |
| 文件頁數： | 21/65頁 |
| 文件大小： | 813K |
| 代理商： | TFP6424PAP |
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TFP6422, TFP6424
PanelBus
DIGITAL TRANSMITTER/VIDEO ENCODER COMBO
SLDS118 – MARCH 2000
28
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
closed caption encoding (continued)
The standard service encodes closed caption only in the ODD field, while the extended service encodes closed
caption in both fields. L21ENA, when set to 1, enables closed caption encoding in ODD field and L21ENB, when
set to 1, enables closed caption encoding in EVEN field.
Use SLINE register at subaddress 6B to program the scan line where closed caption is to be encoded.
Four closed caption data registers contain the data to be encoded. Registers LINE21_O0 and LINE21_O1
contain the first byte and the second byte of close caption data to be encoded in the ODD field. Registers
LINE21_E0 and LINE21_E1 contain the first byte and the second byte of data to be encoded in the EVEN field.
Immediately after the closed caption data is written to the registers either in the ODD field or EVEN field, the
corresponding closed caption status bit, CCE or CCO in STATUS register at subaddress 02, is reset to 0 to
indicate that the closed caption data is available in the closed caption data registers and yet to be encoded.
Immediately after the closed caption is encoded, CCE or CCO bit is set to 1 to indicate that the closed caption
data has been encoded and is ready to accept new data. Null character is automatically inserted if the closed
caption data is not written to the closed caption data registers in time for encoding.
The run–in clock frequency is 5034960.5 Hz ( 32xfline of NTSC). The closed caption data is encoded in the format
of NRZ (Nonreturn to Zero). Additionally, the data translates to IRE scale in the following manner:
0 = 0 IRE; 1 = 50 IRE.
The following four diagrams present the parameters of closed caption line data implemented in different
standards.
10
S
(7 Cycles)
13.9
S
27.4
S
59.65
S
2 Null Characters
Transition Time: 220 nS
Figure 9. NTSC CCIR601 Rate Closed Caption Line
PRODUCT
PREVIEW
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