mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 266

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

Synchronous Operation
11.4.4.6 Self-Refresh Operation
Self-refresh is a method of allowing the SDRAM to enter into a low-power state, while at
the same time to perform an internal refresh operation and to maintain the integrity of the
data stored in the SDRAM. The DRAM controller supports self-refresh with DCR[IS].
When IS is set, the
command is sent to the DRAM controller. Figure 11-23 shows the self-refresh operation.
(DCR[COC] = 0)
11-32
RAS[0] or [1]
RAS[0] or [1]
DRAMW
BCLKO
A[31:0]
DRAMW
BCLKO
SRAS
SCAS
SRAS
SCAS
SCKE
PALL
PALL
SELF
t
t
RCD
NOP
RCD
Freescale Semiconductor, Inc.
NOP
= 2
Figure 11-22. Auto-Refresh Operation
= 2
Figure 11-23. Self-Refresh Operation
command is sent to the SDRAM. When IS is cleared, the
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SELF
REF
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MCF5307 User’s Manual
Active
Self-
SELFX
t
RC
NOP
t
RC
= 6
= 6
NOP
Possible
ACTV
ACTV
First
SELFX