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參數資料

型號：	ADV7180BCPZ
廠商：	ANALOG DEVICES INC
元件分類：	顏色信號轉換
英文描述：	10-Bit, 4 x Oversampling SDTV Video Decoder
中文描述：	COLOR SIGNAL DECODER, QCC40
封裝：	6 X 6 MM, ROHS COMPLIANT, MO-220VJJD-2, LFCSP-40
文件頁數：	59/112頁
文件大小：	1320K
代理商：	ADV7180BCPZ

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ADV7180

C READBACK REGISTERS

Teletext

Because teletext is a high data rate standard, the decoded bytes

are available only as ancillary data. However, a TTXT_AVL bit

has been provided in I

C so that the user can check whether the

VDP has detected teletext or not. Note that the TTXT_AVL bit

is a plain status bit and does not use the protocol identified in

the I C Interface

section.

TTXT_AVL, Teletext Detected Status, Address 0x78 [7],

User Sub Map, Read Only

0—Teletext was not detected.

1—Teletext was detected.

WST Packet Decoding

For WST only, the VDP decodes the magazine and row address

of teletext packets and further decodes the packet’s 8 × 4

hamming coded words. This feature can be disabled using the

WST_PKT_ DECODE_ DISABLE

bit (Bit 3, Register 0x60, User

Sub Map). This feature is valid for WST only.

Rev. A | Page 59 of 112

WST_PKT_DECODE_DISABLE, Disable Hamming

Decoding of Bytes in WST, Address 0x60 [3], User Sub

Map

0—Enables hamming decoding of WST packets.

1 (default)—Disables hamming decoding of WST packets.

For hamming-coded bytes, the dehammed nibbles are output

along with some error information from the hamming decoder

as follows:

Input hamming coded byte: {D3, P3, D2, P2, D1, P1, D0,

P0} (bits in decoded order)

Output dehammed byte: {E1, E0, 0, 0, D3', D2', D1', D0'}

(Di' – corrected bits, Ei error information).

Table 75. Error Bits in the Dehammed Output Byte

E[1:0]

Error Information

No errors detected

Error in P4

Double error

Single error found and corrected

Output Data Bits

in Nibble

Okay

Bad

Okay

Table 76 describes the WST packets that are decoded.

Table 76. WST Packet Description

Packet

Header Packet

(X/00)

Byte

to 10

to 42

to 10

to 23

to 42

to 10

to 23

to 42

Description