mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 438

• Manufacturer Part Number: mcf5407
• Description: Mcf5407 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Data Transfer Operation
Figure 18-10 shows a 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.
18-10
TM[2:0, SIZ[1:0]]
TM[2:0], SIZ[1:0]
A[31:0], TT[1:0]
A[31:0],TT[1:0]
BWEx, OE
BEx, OE
AS, CSx
AS, CSx
D[31:0]
D[31:0]
CLKIN
CLKIN
R/W
R/W
TIP
TIP
TS
TS
TA
TA
Figure 18-10. Write Cycle with Fast Termination
Figure 18-9. Read Cycle with Fast Termination
MCF5407 User’s Manual
S0
S0
S1
S1
Read
S4
S4
Write
S5
S5