Motorola MCF5282 ユーザーズマニュアル
13-8
MCF5282 User’s Manual
MOTOROLA
Data Transfer Operation
• In S4, the external device can stop driving data after the rising edge of CLKOUT.
However data could be driven up to S5.
• For a read cycle, the external device stops driving data between S4 and S5.
States are described in Table 13-3.
13.4.4 Write Cycle
During a write cycle, the MCF5282 sends data to the memory or to a peripheral device. The
write cycle flowchart is shown in Figure 13-7.
write cycle flowchart is shown in Figure 13-7.
Figure 13-7. Write Cycle Flowchart
The write cycle timing diagram is shown in Figure 13-8.
Figure 13-8. Basic Write Bus Cycle
Table 13-3 describes the six states of a basic write cycle.
System
1.
Set R/W to write
2.
Place address on A[31:0]
3.
Assert TIP and SIZ[1:0]
4.
Assert TS
5.
Place data on D[31:0]
6.
Negate TS
1.
Decode address
2.
Store data on D[31:0]
3.
Assert TA
1.
Sample TA low
2.
Stop driving data from D[31:0]
1.
Negate TA
1.
Start next cycle
MCF5282
R/W
TIP
TS
D[31:0]
TA
S0
S1
S2
S3
S4
S5
Write
CLKOUT
CSn, BSn
A[31:0], SIZ[1:0]