SC9641 Silan, SC9641 Datasheet - Page 12

• Manufacturer Part Number: SC9641
• Description: CD Digital Signal Processor
• Manufacturer: Silan

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4.
1 Master controller transmit data
2 Master controller receive data
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
DATA (pin 31): synchronization and data transmission.
STB (pin 32): low level active.
ACK (pin 33): acknowledge signal
INTERFACE DESCRIPTION
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The master controller transmitted data is COMMAND or PARAMETER. Every frame of data transmit,
the master controller start to synchronize, transmit the 8 bits command, then transmit the 4 bits check
data, if sub-controller pass the check data, following transmit continuance or read the command.
The ACK send out acknowledge signal, if the sub-controller received data is match to CHECK data,
ACK signal become low indicate the check passed; if it is not match, ACK signal keep high level, then
exit this communicate. The master controller will operating with the ACK station, the data line keep high
when checking the data.
In the transmitting, if the master controller or sub-controller not response the request in some time
(T<1000us), the system regard this transmit error. The master controller will exit and repeat again or
produce other errors.
In the transmitting, the master controller transmits the DATA when the ACK is low, and the transmitted
DATA is available at STB is high, SC9641 complete write 1 bit after ACK become high.
After master controller transmitted the data code, the sub-controller check the 8 bits command, if it is
match the check data, then send the request data to master controller. The STB of master controller
complete this process.
After transmit the 12 bits data, the sub-controller complete this communication. The master controller
check the 12 bits data, if it is match the check data, this communication complete, the receive data
available. And if it is not match, the receive data invalid, the master controller transmit the read again
command, but it won’ t transmit check data.
In the receiving, if the master controller or sub-controller not response the request in some time
(T<1000us), the system regard this receive error. The master controller will exit and repeat again or
produce other error.
In the receiving, the sub-controller receive the DATA when the ACK is low, and the DATA is read out at
STB is high, SC9641 complete read 1 bit after ACK become high.
MCU
DATA
ACK
STB
DATA
STB
ACK
SC9641
REV:1.0
Page 12 of 15
SC9641
2008.03.24