Datasheet

11.4.2. RSB Interface
RSB interface supports a special protocols with a simplified two wire protocol on a push-pull bus. So the
transfer speed can be up to 10MHz and the performance will be improved much. AC101 works only in
slave mode.
RSB support multi-slaves. It uses CK as clock and uses CD to transmit command and data.the Bus
Topology is showed below:
Figure 9 RSB Bus Topology
The start bit marks the beginning of a transaction with the slave device.When CK is high, a change from
high to low on CD is defined as a start condition. This start condition notifies the selected device to start a
transfer.
Figure 10 Start signal
RSB protocol uses parity bit to check the correction of every byte,The checked object is the 7, 8 or 15 bit in
front of the parity bit.
Figure 11 Parity bit
ACK bit is the acknowledgement from device to host, The ACK is active low. When device finds the parity
bit is error, it will not send ACK to host, so host can know that an error happens in the transaction.
Set run-time slave address(RTSADDR) command. It is used to set run time slave address(RTSADDR) for
different devices in the same system. There are 15 devices in a system at most. The RTSADDR can be
selected from the command code set and a device 's RTSADDR can be modified many times by using set
run-time slave address command.