On-Chip Communication Architectures

74 CHAPTER 3 On-Chip Communication Architecture Standards

the target (slave) by sending the OPC for the transfer (either read or write), the

transfer address ( ADD), and the byte enable ( BE) to specify which bytes in the

bus are signifi cant, based on the width of the data involved in the transfer (1–8

bytes). The write data bus ( DATA) to send the write data (for a write data transfer).

The slave indicates it has received the transfer request by asserting the handshake

signal ( R_REQ), and then proceeds to return the read data on the read data bus

(R_DATA) or write data in its address space for a write data transfer. The slave

returns an optional ...