Marantz SR7300 - 2. Technical Description; Audio Technologies Overview

Hardware Software Interface (HSI) Spec. Page: 4 / 19
SR7300/SR7300OSE Document Version [2.01]
3. Detailed Description
The interface specification between this product and a Host controller is described below.
3-1. Connection format
3-1-1. Physical connection
Host (Controller) Slave (This product)
(Serial setting <RS232C basic>)
Baud Rate : 9600bps
Data Bits : 8bit
Parity : None
Stop bit : 1bit
Handshaking : (RTS/CTS)
3-1-1-1. Data transmission sequence from Host to Slave
Host (Controller) Slave (This product)
RTS → CTS
CTS ← RTS
TxD → RxD
RxD ← TxD
1. The host checks that CTS is High, then starts a data transmission from TxD.
2. The host performs the data transmission of the number of required bytes, and ends a transmission.
* The host can do RTS to Low during the transmission for disable data transmission from a slave.
3-1-1-2. Data transmission sequence from Slave to Host
Host (Controller) Slave (This product)
RTS → CTS
CTS ← RTS
TxD → RxD
RxD ← TxD
1. The slave checks that CTS is High, then starts a data transmission from TxD.
2. The slave performs the data transmission of the number of required bytes, and ends a transmission.
* The slave can do RTS to Low during the transmission for disable data transmission from a host.
RTS
CTS
TxD
RxD
GND
CTS
RTS
RxD
TxD
GND