MCF5272VF66 Freescale, MCF5272VF66 Datasheet - Page 198
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MCF5272VF66
Manufacturer Part Number
MCF5272VF66
Description
Manufacturer
Freescale
Datasheet
1.MCF5272VF66.pdf
(544 pages)
Specifications of MCF5272VF66
Family Name
MCF5xxx
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
66MHz
Instruction Set Architecture
RISC
Supply Voltage 1 (typ)
3.3V
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
196
Package Type
MA-BGA
Lead Free Status / RoHS Status
Not Compliant
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SDRAM Controller
9.5.2
The SDTR is used to configure SDRAM controller refresh counters for the type of SDRAM devices used
and the number of clocks required for each type of SDRAM access. The reset value is 0x2115. For lower
CPU clock frequencies, precharge and activate times can be reduced to eliminate up to 2 clock cycles from
the read and write accesses. Consult the data sheets of the SDRAMs being considered.
Table 9-8
9-8
15–10
Bits
9–8
7–6
5–4
Reset
Write
Addr
R/W
Name
RTP
describes SDTR fields.
RC
RP
—
SDRAM Timing Register (SDTR)
15
Refresh timer prescaler. Determines the number of clock cycles x 16 between refreshes. The following table
describes different recommended prescaler settings for different clock frequencies including a margin of 1.2
μS. Recommended values are as follows:
Refresh count. Indicates the number of clock cycles spent in refresh state (RC + 5). Refresh occurs during
the first of these clock cycles; the rest of the time is the delay that must occur before the SDRAM is ready
to do anything else.
00 5 cycles
01 6 cycles (default)
10 7 cycles
11 8 cycles
Reserved, should be cleared.
Precharge time. Specifies number of clock cycles taken for a precharge (RP + 1).
00 1 cycle
01 2 cycles (default)
10 3 cycles
11 4 cycles
MCF5272 ColdFire
0010_00
RTP
111101
101011
011101
010110
000100
Figure 9-4. SDRAM Timing Register (SDTR)
RTP
Table 9-8. SDTR Field Descriptions
®
Integrated Microprocessor User’s Manual, Rev. 3
10
15.6 µs = 1/f*RTP*16
9
RC
MBAR + 0x0186
01
8
61
43
29
22
R/W
4
Description
7
—
00
6
5 MHz (emulator)
5
System Clock
RP
01
66 MHz
48 MHz
33 MHz
25 MHz
4
3
RCD
01
Freescale Semiconductor
2
1
CLT
01
0
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