參數(shù)資料
型號(hào)： ADV7183KST
廠商： ANALOG DEVICES INC
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： Advanced Video Decoder with 10-Bit ADC and Component Input Support
中文描述： COLOR SIGNAL DECODER, PQFP80
封裝： PLASTIC, LQFP-80
文件頁(yè)數(shù)： 18/41頁(yè)
文件大?。?/td> 484K
代理商： ADV7183KST
REV. 0
–18–
ADV7183
Manual Clock Control
The ADV7183 offers several output clock mode options; the
output clock frequency can be set by the input video line length, a
fixed 27 MHz output, or by a user-programmable value. Informa-
tion on the clock control register at 28h can be found in the
register access map. When Bit 6 of this register (CLKMANE) is
set to Logic “1,” the output clock frequency will be determined
by the user-programmable value (CLKVAL[15:0]). Using this
mode the output clock frequency is calculated as:
LLC
CLKVAL
MHz
=
×
×
×
[
17: ]
2
28
3
16
27
20
For example, a required clock frequency of 25 MHz would yield
a CLKVAL of 2D266h (184934).
Color Subcarrier Control
The color subcarrier manual frequency control register
(CSMF[27:0]) can be used to set the DDFS block to a user-
defined frequency. This function can be useful if the color
subcarrier frequency of the incoming video signal is outside the
standard F
SC
lock range. Setting Bit 4 Reg 23h (CSM) to a
Logic “1” enables the manual frequency control, the frequency
of which will be determined by CSMF[27:0]. The value of
CSMF[27:0] can be calculated as:
CSMF
F
MHz
SC
[
2: ]
2
27
28
=
×
*
Required
MPU PORT DESCRIPTION
The ADV7183 supports a 2-wire serial (I
2
C-compatible) micro-
processor bus driving multiple peripherals. Two inputs, serial
data (SDATA) and serial clock (SCLOCK) carry information
between any device connected to the bus. Each slave device is
recognized by a unique address. The ADV7183 has two possible
slave addresses for both read and write operations. These are
unique addresses for the device and are illustrated in Figure 27.
The LSB sets either a read or write operation. Logic Level “1”
corresponds to a read operation while Logic Level “0” corre-
sponds to a write operation. A1 is set by setting the ALSB pin of
the ADV7183 to Logic Level “0” or Logic Level “1.”
1
0
0
0
1
0
1
A
1
X
2
1
Address Control. Set up by ALSB.
2
Read/Write Control. Write = 0; Read = 1
Figure 27. Slave Address
To control the device on the bus the following protocol must be
followed. First the master initiates a data transfer by establishing
a start condition, defined by a high to low transition on SDATA
while SCLOCK remains high. This indicates that an address/data
stream will follow. All peripherals respond to the start condition
and shift the next 8 bits (7-bit address + R/
W
bit). The bits are
transferred from MSB down to LSB. The peripheral that recognizes
the transmitted address responds by pulling the data line low
during the ninth clock pulse. This is known as an acknowledge bit.
All other devices withdraw from the bus at this point and maintain
an idle condition. The idle condition is where the device monitors
the SDATA and SCLOCK lines waiting for the start condition
and the correct transmitted address. The R/
W
bit determines the
direction of the data. A Logic “0” on the LSB of the first byte
means that the master will write information to the peripheral.
A Logic “1” on the LSB of the first byte means that the master
will read information from the peripheral.
The ADV7183 acts as a standard slave device on the bus. The
data on the SDATA pin is 8 bits long, supporting the 7-bit
addresses plus the R/
W
bit. The ADV7183 has 71 subaddresses
to enable access to the internal registers. It therefore interprets
the first byte as the device address and the second byte as the
starting subaddress. The subaddresses autoincrement, allowing
data to be written to or read from the starting subaddress. A
data transfer is always terminated by a stop condition. The user
can also access any unique subaddress register on a one-by-one
basis, without having to update all the registers.
Stop and start conditions can be detected at any stage during the
data transfer. If these conditions are asserted out of sequence
with normal read and write operations, they cause an immediate
jump to the idle condition. During a given SCLOCK high period
the user should only issue one start condition, one stop condition,
or a single stop condition followed by a single start condition. If
an invalid subaddress is issued by the user, the ADV7183 will
not issue an acknowledge and will return to the idle condition.
If the user exceeds the highest subaddress in autoincrement mode,
the following action will be taken:
1. In read mode, the highest subaddress register contents
will continue to be output until the master device issues a
no-acknowledge. This indicates the end of a read. A
no-acknowledge condition is where the SDATA line is not
pulled low on the ninth pulse.
2. In write mode, the data for the invalid byte will not be loaded
into any subaddress register, a no-acknowledge will be issued
by the ADV7183, and the part will return to the idle condition.
WRITE
SEQUENCE
READ
SEQUENCE
S
SLAVE ADDR
A(S)
DATA
S
A(S)
SLAVE ADDR
SUB ADDR
SUB ADDR
A(S)
A(S)
S
A(S)
SLAVE ADDR
A(S)
DATA
A(M)
DATA
A(S)
P
DATA
A
(M)
P
LSB = 0
LSB = 1
S = START BIT
P = STOP BIT
A(S) = ACKNOWLEDGE BY SLAVE
A(M) = ACKNOWLEDGE BY MASTER
A
(S) = NO-ACKNOWLEDGE BY SLAVE
A
(M) = NO-ACKNOWLEDGE BY MASTER
Figure 28. Write and Read Sequences
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