Motorola MPC823e - Page 324

External Bus Interface
MOTOROLA MPC823e REFERENCE MANUAL 13-17
EXTERNAL BUS
13
INTERFACE
Figure 13-10. Basic Flow Diagram Of A Burst Read Cycle
MASTER SLAVE
REQUEST BR
RECEIVE BG FROM ARBITER
ASSERT BB
IF NO OTHER MASTER IS DRIVING
ASSERT TS
ASSERT ADDRESS AND ATTRIBUTES
RECEIVE ADDRESS
RETURN DATA
ASSERT TA
RECEIVE DATA
ASSERT BURST
ASSERT BDIP
BDIP ASSERTED
YES
RETURN DATA
ASSERT TA
RECEIVE DATA
BDIP ASSERTED
YES
RETURN DATA
ASSERT TA
RECEIVE DATA
BDIP ASSERTED
YES
RETURN DATA
ASSERT TA
RECEIVE DATA
NEGATE BDIP
NO
DO NOT
DRIVE DATA
NO
DO NOT
DRIVE DATA
NO
DO NOT
DRIVE DATA
NEGATE BURST
STOP DRIVING ADDRESS AND ATTRIBUTES
NEGATE BB