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179
Bit:
15
14
13
12
11
10
9
8
TPC
RCD
TRAS1
TRAS0
DWW1
DWW0
DWR1
DWR0
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
DIW
—
BE
RASD
SZ1
SZ0
AMX1
AMX0
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
•
Bit 15—RAS Precharge Cycle Count (TPC): Specifies the minimum number of cycles after
RAS
is negated before next assert.
Bit 15 (TPC)
Description
0
1.5 cycles (initial value)
1
2.5 cycles
•
Bit 14—RAS-CAS Delay Cycle Count (RCD): Specifies the number of row address output
cycles.
Bit 14 (RCD)
Description
0
1 cycle (initial value)
1
2 cycles
•
Bits 13–12—CAS-Before-RAS Refresh RAS Assert Cycle Count (TRAS1–TRAS0): Specify
the number of RAS assert cycles for CAS before RAS refreshes.
Bit 13 (TRAS1)
Bit 12 (TRAS0)
Description
0
0
2.5 cycles (initial value)
1
3.5 cycles
1
0
4.5 cycles
1
5.5 cycles
Содержание SH7041 Series
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Страница 250: ...212 ...
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Страница 604: ...566 ...
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Страница 706: ...668 ...
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Страница 923: ...SH7040 SH7041 SH7042 SH7043 SH7044 SH7045 Group Hardware Manual REJ09B0044 0600O ...