MCF5307FT90B Freescale Semiconductor, MCF5307FT90B Datasheet - Page 265

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MCF5307FT90B

Manufacturer Part Number
MCF5307FT90B
Description
IC MPU 32BIT COLDF 90MHZ 208FQFP
Manufacturer
Freescale Semiconductor
Series
MCF530xr
Datasheets

Specifications of MCF5307FT90B

Core Processor
Coldfire V3
Core Size
32-Bit
Speed
90MHz
Connectivity
EBI/EMI, I²C, UART/USART
Peripherals
DMA, POR, WDT
Number Of I /o
16
Program Memory Type
ROMless
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
208-FQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
Data Converters
-

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11.4.4.5 Auto-Refresh Operation
The DRAM controller is equipped with a refresh counter and control. This logic is
responsible for providing timing and control to refresh the SDRAM. Once the refresh
counter is set, and refresh is enabled, the counter counts to zero. At this time, an internal
refresh request flag is set and the counter begins counting down again. The DRAM
controller completes any active burst operation and then performs a
DRAM controller then initiates a refresh cycle and clears the refresh request flag. This
refresh cycle includes a delay from any precharge to the auto-refresh command, the
auto-refresh command, and then a delay until any
access initiated during the auto-refresh cycle is delayed until the cycle is completed.
Figure 11-22 shows the auto-refresh timing. In this case, there is an SDRAM access when
the refresh request becomes active. The request is delayed by the precharge to
programmed into the active SDRAM bank by the CAS bits. The
generated and the delay required by DCR[RTIM] is inserted before the next
command is generated. In this example, the next bus cycle is initiated, but does not generate
an SDRAM access until T
command, it is passed to both blocks of external SDRAM.
RAS[0] or [1]
Figure 11-21. Synchronous, Continuous Page-Mode Access—Read after Write
CAS[3:0]
DRAMW
BCLKO
A[31:0]
D[31:0]
SRAS
SCAS
ACTV
t
RCD
Row
Chapter 11. Synchronous/Asynchronous DRAM Controller Module
= 3
Freescale Semiconductor, Inc.
RC
For More Information On This Product,
NOP
is finished. Because both chip selects are active during the
Go to: www.freescale.com
WRITE
Column
NOP
ACTV
READ
command is allowed. Any SDRAM
Column
t
CASL
NOP
= 3
REF
NOP
Synchronous Operation
PALL
command is then
operation. The
NOP
t
EP
ACTV
PALL
delay
ACTV
11-31
REF

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