mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 264

• Manufacturer Part Number: mcf5307cft90b
• Description: Mcf5307 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Synchronous Operation
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
Figure 11-21 shows a write followed by a read in continuous page mode. Because the bus
cycle is terminated with a
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.
11-30
Figure 11-20. Synchronous, Continuous Page-Mode Access—Consecutive Reads
RAS[0] or [1]
• Because of the nature of the internal CPU pipeline this condition does not occur
CAS[3:0]
DRAMW
BCLKO
A[31:0]
D[31:0]
SRAS
SCAS
often; however, the use of continuous page mode is recommended because it can
provide a slight performance increase.
ACTV
ACTV
t
RCD
Row
= 2
NOP
Freescale Semiconductor, Inc.
command.
For More Information On This Product,
WRITE
READ
t
CASL
command, the second cycle begins sooner after the write
Go to: www.freescale.com
MCF5307 User’s Manual
= 2
Column
NOP
READ
t
CASL
Column
= 2
NOP
NOP
t
EP
PALL