msm7654 Oki Semiconductor, msm7654 Datasheet - Page 16

• Manufacturer Part Number: msm7654
• Description: Ntsc/pal Digital Video Encoder
• Manufacturer: Oki Semiconductor

4) Scanning System
NTSC and PAL systems support both interlaced scanning and non-interlaced scanning.
In the master mode, it is possible to select the desired setting from the above settings by switching
Since either odd fields or even fields are consecutively output, the resolution is halved. However,
¡ Semiconductor
the internal registers. In the master mode, only odd fields can be consecutively scanned. In the
slave mode, it is possible to consecutively output odd fields or even fields by using phase
information from VSYNC_L and HSYNC_L.
setting of non-interlaced scanning eliminates flicker of the screen display which appears when
moving of pictures is stopped in the interlaced scanning.
5) I
The input format of I
As described above, it is possible to write data from subaddress to subaddress continuously.
Writing to discontinuous addresses is performed by repeating the Acknowledge and Stop
condition formats after Data 0.
If one of the following matters occurs, the encoder will not return "A" (Acknowledge).
• The slave address does not match.
• A non-existent subaddress is specified.
• The write attribute of a register does not match "X" which is the 8th bit (LSB) of the slave address
S
("X" = 0 because this LSI is write only).
2
S
Slave Address
A
Subaddress
Data n
P
C Bus Format
Slave Address
NTSC
NTSC
PAL
PAL
Symbol
Interlaced
Non-interlaced
Interlaced
Non-interlaced
2
A
C-bus interface is shown below.
Start condition
Slave address 1000100X.
The 8th bit is write (0) signal.
Acknowledge. Generated by slave
Subaddress byte
Write to the address specified by the subaddress.
Stop condition
Subaddress
A
262.5 lines at 60 Hz
262 lines at 60 Hz
312.5 lines at 50 Hz
312 lines at 50 Hz
Data 0
Description
A
.....
Data n
MSM7654
16
A P