TMP92CF30
2009-06-12
92CF30-200
(6)
Refresh control
The TMP92CF30 supports two kinds of refresh commands: Auto Refresh and Self Refresh.
(a)
Auto Refresh
When SDRCR<SRC> is set to “1”, the Auto Refresh command is automatically issued at
intervals specified by SDRCR<SRS2:0>. The Auto Refresh interval can be specified in a
range of 47 states to 1248 states (0.78
μ
s to 20.8
μ
s at f
SYS
=
60 MHz).
The CPU operation (instruction fetch and execution) is halted while the Auto Refresh
command is being executed. Figure 3.10.6 shows the Auto Refresh cycle timing, and Table
3.10.3 shows the Auto Refresh interval settings. The Auto Refresh function cannot be used
in IDLE1 and STOP modes. In these modes, use the Self Refresh function to be explained
next.
Note: A system reset disables the Auto Refresh function.
Figure 3.10.6 Auto Refresh Cycle Timing
Note1: Set the interval of Auto Refresh as below table for your reference.
Note2: Take care SDRAM specification and CPU operation speed, please.
Table 3.10.3 System clock speed & auto refresh interval
SDRCR<SRS2:0>
Frequency: system clock [ MHz ]
1 2 3 4 6 8 10
20
30
40
60
80
SRS2 SRS1 SRS0
interval
state
Time: auto refresh interval [
μ
s ]
0 0 0 47 47.0
23.5
15.67
11.75
7.83
5.88
4.70
2.35
1.57 1.18 0.78
0.59
0 0 1 78 78.0
39.0
26.0
19.5
13.0
9.75
7.80
3.9
2.60 1.95 1.30
0.98
0 1 0 156
156.0
78.0
52.0
39.0
26.0
19.5
15.60
7.8
5.20 3.90 2.60
1.95
0 1 1 312
312.0
156.0
104.0
78.0
52.0
39.0
31.2
15.60
10.4 7.80 5.20
3.90
1 0 0 468
468.0
234.0
156.0
117.0
78.0
58.5
46.8
23.4
15.60 11.7 7.80
5.85
1 0 1 624
624.0
312.0
208.0
156.0
104.0
78.0
62.4
31.2
20.8 15.60 10.4
7.80
1 1 0 936
936.0
468.0
312.0
234.0
156.0
117.0
93.6
46.8
31.2
23.4 15.60
11.70
1 1 1 1248
1248.0 624.0
416.0
312.0
208.0
156.0
124.8
62.4
41.6
31.2
20.8
15.60
Note: Above gray zone is prohibited to set. SDRAM request: 4096 times per 64ms.(Refresh request: under 15.625
μ
s)
SDCLK
SDCKE
SDLUDQM
SDLLDQM
Auto Refresh
2 states
SDCS
SDRAS
SDCAS
SDWE
Содержание TLCS-900/H1 Series
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