Freescale Semiconductor MPC5553 - Page 510

MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 12-61
Figure 12-43. Basic Flow Diagram of an EBI Read Access in External Master Mode
Master (EBI) Slave
No
Yes
External
Arbitration
?
Request Bus (BR)
Receives Bus Grant (BG)
Asserted from External Arbiter
Receives BB
Negated
Negates BR
if No Other Requests
No
Yes
EBI
has Priority
?
Negates BG if Asserted
Asserts Bus Busy (BB)
if No Other Master is Driving
Assert Transfer Start (TS)
Drives Address and Attributes
Receives Address
Yes
No
Receives Data
Drives Data
Asserts
Transfer Acknowledge (TA
)
Asserts
Transfer Acknowledge (TA
)
CS
Access
?