Datasheet

18-10 MCF5407 User’s Manual
Data Transfer Operation
Figure 18-9. Read Cycle with Fast Termination
Figure 18-10 shows a write cycle with fast termination.
Figure 18-10. Write Cycle with Fast Termination
18.4.6 Back-to-Back Bus Cycles
The MCF5407 runs back-to-back bus cycles whenever possible. For example, when a
longword read is started on a word-size bus, the processor performs two back-to-back word
read accesses. Back-to-back accesses are distinguished by the continuous assertion of TIP
throughout the cycle. Figure 18-11 shows a read back-to-back with a write.
A[31:0],TT[1:0]
R/W
TIP
TS
D[31:0]
T
A
S0 S1 S4 S5
Read
CLKIN
AS
, CSx
BEx, OE
TM[2:0, SIZ[1:0]]
A[31:0], TT[1:0]
R/W
TIP
TS
AS, CSx
D[31:0]
T
A
S0 S1 S4 S5
Write
CLKIN
BWE
x, OE
TM[2:0], SIZ[1:0]