114
•
Bits 14 and 13 (Long Wait Insertion in Areas 0 and 2, Bits 1, 0 (A02LW1 and A02LW0)):
A02LW1 and A02LW0 select the long wait states to be inserted (1–4 states) when accessing
external memory space of areas 0 and 2.
Bit 14: A02LW1
Bit 13: A02LW0
Description
0
0
1 state inserted
1
2 states inserted
1
0
3 states inserted
1
4 states inserted
(Initial value)
•
Bits 12 and 11 (Long Wait Insertion in Area 6, Bits 1, 0 (A6LW1 and A6LW0)): A6LW1 and
A6LW0 select the long wait states to be inserted (1–4 states) when accessing external memory
space of area 6.
Bit 12: A6LW1
Bit 11: A6LW0
Description
0
0
1 state inserted
1
2 states inserted
1
0
3 states inserted
1
4 states inserted
(Initial value)
•
Bits 10–0 (Reserved): These bits are always read as 0. The write value should always be 0.
8.2.5
DRAM Area Control Register (DCR)
The DRAM area control register (DCR) is a 16-bit read/write register that selects the type of
DRAM control signal, the number of precharge cycles, the burst operation mode, and the use of
address multiplexing. DCR settings are valid only when the DRAME bit in BCR is set to 1. It is
initialized to H'0000 by a power-on reset, but is not initialized by a manual reset or in standby
mode.
Bit:
15
14
13
12
11
10
9
8
Bit name:
CW2
RASD
TPC
BE
CDTY
MXE
MXC1
MXC0
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
Содержание HD6417032
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Страница 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
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