Marantz SR7300 - Manual (Page 6)

Hardware Software Interface (HSI) Spec. Page: 6 / 19
SR7300/SR7300OSE Document Version [2.01]
3-3. The transaction sequences and the regulations
3-3-1. The transaction sequences
The transactions have two kinds of sequence.
*A transaction is a Command from Host then the Slave will be an answer by ACK or NAK.
*A transaction is a Status request from Host then the Slave will be an answer by Status answer.
3-3-2. The transaction regulations
The transactions have some kinds of regulation.
* A Command or a Status request transmission by the Host has to finish within one second.
* An answer (ACK, NAK or Status answer) transmittion by the Slave has to finish within one second
when got a Command or a Status request from the Host.
* The Host must not transmit an another Command or Status request until "it receives a answer by a
previous Command or Status request" or "it passes one second from a finishing of previous transmission
of a Command or a Status request ".
3-3-3. Example of the transactions
<Host> <Slave>
RTS CTS
CTS RTS
TxD RxD
RxD TxD
Example of the transactions
max. 1sec
max. 1sec
a transaction a transaction
Command
ACK/NAK
Status request
Status answer
max. 1sec
max. 1sec