Datasheet

11-30 MCF5307 User’s Manual
Synchronous Operation
• Because of the nature of the internal CPU pipeline this condition does not occur
often; however, the use of continuous page mode is recommended because it can
provide a slight performance increase.
Figure 11-20 shows two read accesses in continuous page mode. Note that there is no
precharge between the two accesses. Also notice that the second cycle begins with a read
operation with no
ACTV command.
Figure 11-20. Synchronous, Continuous Page-Mode Access—Consecutive Reads
Figure 11-21 shows a write followed by a read in continuous page mode. Because the bus
cycle is terminated with a
WRITE command, the second cycle begins sooner after the write
than after the read. A read requires data to be returned before the bus cycle can terminate.
Note that in continuous page mode, secondary accesses output the column address only.
A[31:0]
SRAS
SCAS
DRAMW
D[31:0]
ACTV NOP READNOP
RAS[0] or [1]
CAS
[3:0]
READ NOP
NOP
PALL
t
CASL
= 2
t
RCD
= 2
t
CASL
= 2
t
EP
Row Column Column
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