cxd2085m Sony Electronics, cxd2085m Datasheet - Page 5

• Manufacturer Part Number: cxd2085m
• Description: Id-1 Detection
• Manufacturer: Sony Electronics

In the CXD2085M, the above 14-bit data are obtained in the I
can be output to OLBX (Pin 15) and O169 (Pin 16) set as the direct output pins.
2. Difference between ID-1 Data from the I
As shown in the figure above, the data validity determination which detects that the valid ID signal is exist or
not, and the decoded result are obtained independently during ID-1 decoding. These two results are output to
the direct output pins after taking their logical AND.
Processing inside the microcomputer which has acquired the information from the I
by simply outputting this data directly to the pins or by taking the logical AND as above.
In addition, performing the processing when the data validity determination (VBVLD) is "1" and the decoding
results bits 1 and 2 are "0" allows the video to be identified as 4:3 video.
3. General-Purpose I/O Port Function
In I
I/O ports. The three types of setting are available; both two pins for inputs, for outputs, and one for input and
another for output. While resetting by XRST (Pin 1) in I
input ports. Perform the power-on reset by XRST when there is a possibility that the IC external circuit and the
OLBX and O169 signals could collide. Be sure to set the OLBX and O169 pins as the output pins when they
are not used.
1. Description of ID-1 (transmission system of additional video information, aspect ratio identification)
As shown in the table below, the additional video information consists of 14-bits data, and a 6-bit CRCC is
added to the data to form 20-bit data in total. This is carried on lines 20 and 283 in the vertical blanking area of
the NTSC video signal.
Table 1. Description of ID-1 signal
WORD0
2
C bus mode, the CXD2085M can use two pins OLBX (Pin 15) and O169 (Pin 16) as the general-purpose
WORD1
WORD2
CXD2085M
A
B
Data validity determination
Bit No.
ID-1 decoding
4bits
4bits
1
2
3
4
5
6
Transmission aspect ratio
Screen display format
Not defined
Identification information relating to the video signals and other signals (audio
signals, etc.) transmitted simultaneously with the video signals
Identification signal dependent on WORD0
Identification signal and other information dependent on WORD0
Description
2
C Bus and Direct Output Pin
14
– 5 –
VBVLD
2
C bus mode, two pins are set as the general-purpose
(From the Provisional standard of EIAJ, CPX-1204)
2
C bus for I
Full-mode (16:9)
Letter-box
I
2
2
C
C bus mode. Also, first two bits only
"1"
—
2
2
C bus is performed either
Direct pin outputs
OLBX, O169
To microcomputer
Normal
4:3
"0"
—
CXD2085M