Motorola DSP56301 - Manual (Page 223)

ESSI Programming Model
Enhanced Synchronous Serial Interface (ESSI) 7 -25
Figure 7-7. CRB SYN Bit Operation
External Frame SYNC
SC1
Asynchronous (SYN = 0)
Transmitter
Clock
Frame
SYNC
Receiver
Clock Frame
SYNC
SRD
STD
SC2
External Transmit Frame SYNC
External Receive Frame SYNC
Internal Frame SYNC
SC0
SCK
External Transmit Clock
External Receive Clock
Internal Clock ESSI Bit
Clock
Note: Transmitter and receiver may have different clocks and frame syncs.
SYNCHRONOUS (SYN = 1)
Transmitter
Clock
Frame
SYNC
Receiver
Clock Frame
SYNC
SRD
STD
SC2
Internal Frame SYNC
SCK
External Clock
Internal Clock ESSI Bit
Clock
Note: Transmitter and receiver may have the same clock frame syncs.