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AD1892 Arkusz danych(PDF) 5 Page - Analog Devices

Numer części AD1892
Szczegółowy opis  Integrated Digital Receiver/Rate Converter
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Strona internetowa  http://www.analog.com
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AD1892 Arkusz danych(HTML) 5 Page - Analog Devices

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AD1892
REV. 0
–5–
Decoded Channel Status Outputs (Continued)
Pin Name SOIC
I/O
Description
CC
19
O
In consumer mode, CC is the inverse Channel Status Bit 3, Byte 0 (
C3, pre-emphasis). CC = 0
indicates that the audio material has been pre-emphasized; CC = 1 indicates that the audio material
has not been pre-emphasized.
In professional mode, CC is the most significant bit of the two bits that encodes the emphasis status
of the audio material.
Table I illustrates the professional mode emphasis encoding.
Table I. Professional Mode Emphasis Encoding
AD1892
BYTE 0
Output
Channel Status Bit
CC
CB
C2
C3
C4
Status
1
1
0
0
0
Emphasis not indicated. Receiver defaults to
no emphasis with manual override enabled.
1
0
1
0
0
None. Receiver manual override disabled.
0
1
1
1
0
50/15
µs. Receiver manual override disabled.
0
0
1
1
1
CCITT J. 17. Receiver manual override disabled.
CD
18
O
In consumer mode, CD indicates that the audio material is original over all category codes. The
state of this bit is affected by both the generation status “L” bit (Channel Status Bit 15, Byte 1) and
the category code (Channel Status Bits 8 through 14, Byte 1) since the definition of the L bit is re-
versed for three of the category codes (001XXXX, 0111XXX, and 100XXXX). CD = 0 indicates
that the audio material is original. CD = 1 indicates that the audio material is a copy (first genera-
tion or higher).
In professional mode, CD is the inverse of Channel Status Bit 9, Byte 1. CD provides some infor-
mation about channel mode. See below for additional details.
CE
17
O
In consumer mode, CE indicates the so-called “ignorant” category codes of “general” (0000 000)
and “A/D converter without copyright information” (0110 000). CE = 1 indicates that the audio
material is not encoded using an ignorant category code. CE = 0 indicates that the audio material is
encoded using an ignorant category code. This status output can be used in conjunction with the
CD output (Pin 18) to implement SCMS copy protection. See below for additional details.
In professional mode, CE indicates a Cyclic Redundancy Code (CRC) check error. CE = 0 indi-
cates that the calculated CRC value does not match the received CRC value. CE = 1 indicates that
the calculated CRC value does match the received CRC value. CE may be used to enable the dis-
play of the CA through CD states. If CE = 0, then CA through CD may be considered to be in
error, and their display should not be updated.
The Table II summarizes the function of the CA through CE pins, depending on the operating mode
(professional or consumer).
Table II. Decoded Channel Status Output Functions
Pin
Consumer
Professional
CA
0 = Audio, 1 = Nonaudio
0 = Audio, 1 = Nonaudio
CB
0 = Copy Permitted, 1 = Copy Inhibited
Pre-emphasis Encoding
CC
0 = Pre-emphasis, 1 = No Pre-emphasis
Pre-emphasis Encoding
CD
0 = Original, 1 = Copy
Inverse of Channel Status Bit 9
CE
0 = Ignorant Category, 1 = Not Ignorant
0 = C.S. CRC Error, 1 = No C.S. CRC Error
CON/
PRO
15
O
CON/
PRO is defined as the inverse Channel Status bit 0, byte 0 (C0, pro/consumer). CON/PRO =
0 indicates professional mode. CON/
PRO = 1 indicates consumer mode. The state of this pin inter-
nally determines the consumer/pro mode of the CA, CB, CC, CD and CE pins.
CSCLK
16
O
Channel Status Clock. Active HI (rising edge active). Outputs a pulse every 192 frames at the
start of the Channel Status block. Use the falling edge of this clock to latch the CA through CE
and CON/
PRO output Channel Status signals. See Figure 38 for timing.


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