msm7664 Oki Semiconductor, msm7664 Datasheet - Page 37

• Manufacturer Part Number: msm7664
• Description: Ntsc/pal Digital Video Decoder
• Manufacturer: Oki Semiconductor

As mentioned above, the write/read operation can be executed from subaddress to subaddress
continuously. When the write/read operation is executed at subaddresses discontinuously, the
Acknowledge and Stop condition formats are input repeatedly after Data 0.
Data can be read at subaddress 0x20 only.
The content of read register (VBID-related data) is held unless reset is instructed by the register
at address 1f. The input format is shown in "READ MODE2".
The equipment should return an acknowledge signal for read data.
If one of the following matters occurs, the decoder 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" (read ["1"]/write ["0"] control bit).
The input timing is shown below.
¡ Semiconductor
SDA
SCL
S
Slave Address
A, A'
Subaddress
Data n
Data m
P
Start Condition
Symbol
S
1
2
Slave Address
Start condition
Slave address 1000001X, 8th bit is write signal ["0"] or read signal ["1"]
Slave address is set at M[2] pin (pin 89).
Acknowledge. Generated by slave
Subaddress byte
Data to write to address designated by subaddress.
Data to read from address designated by subaddress
Stop condition
8
ACK
1
2
Subaddress
8
Description
ACK
1
2
Data
8
PEDL7664-01
Stop Condition
ACK
MSM7664
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