CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION
User’s Manual U12688EJ4V0UM00
139
5.3.4 DRAM configuration registers 0 to 3 (DRC0 to DRC3)
This sets the type of DRAM to be connected.
These registers can be read/written in 16-bit units.
Caution If the object of access is a DRAM area, the wait set in registers DWC1 and DWC2 becomes invalid.
In this case, waits are controlled by registers DRC0 to DRC3.
0
DAW
00
Address
FFFFF200H
After reset
3FC1H
1
DAW
10
2
3
4
5
6
CPC
00
7
CPC
10
8
DAC
00
9
DAC
10
RHC
00
RHC
10
RPC
00
RPC
10
PAE
00
PAE
10
10
0
11
0
12
13
0
DAW
01
DAW
11
CPC
01
CPC
11
DAC
01
DAC
11
RHC
01
RHC
11
RPC
01
RPC
11
PAE
01
PAE
11
0
0
0
DAW
02
DAW
12
CPC
02
CPC
12
DAC
02
DAC
12
RHC
02
RHC
12
RPC
02
RPC
12
PAE
02
PAE
12
0
0
0
DAW
03
DAW
13
CPC
03
RHD
0
RHD
1
RHD
2
RHD
3
CPC
13
DAC
03
DAC
13
RHC
03
RHC
13
RPC
03
RPC
13
PAE
03
PAE
13
0
0
0
14
15
DRC0
FFFFF202H
3FC1H
DRC1
FFFFF204H
3FC1H
DRC2
FFFFF206H
3FC1H
DRC3
Bit Position
Bit Name
Function
DRAM On-page Access Mode Control
Controls the on-page access cycle.
PAE1n
PAE0n
Access Mode
0
0
On-page access disabled.
0
1
High-speed page DRAM
1
0
EDO DRAM
1
1
Setting prohibited
15, 14
PAE1n,
PAE0n
Row Address Precharge Control
Specifies the number of wait states inserted as row address precharge time.
RPC1n
RPC0n
Number of Wait States Inserted
0
0
0
0
1
1
1
0
2
1
1
3
13, 12
RPC1n,
RPC0n
Remark
n = 0 to 3
Содержание V850E/MS1 UPD703100
Страница 2: ...User s Manual U12688EJ4V0UM00 2 MEMO ...
Страница 6: ...User s Manual U12688EJ4V0UM00 6 MEMO ...
Страница 8: ...User s Manual U12688EJ4V0UM00 8 MEMO ...
Страница 12: ...User s Manual U12688EJ4V0UM00 12 MEMO ...
Страница 26: ...User s Manual U12688EJ4V0UM00 26 MEMO ...
Страница 68: ...User s Manual U12688EJ4V0UM00 68 MEMO ...
Страница 124: ...User s Manual U12688EJ4V0UM00 124 MEMO ...
Страница 198: ...User s Manual U12688EJ4V0UM00 198 MEMO ...
Страница 230: ...User s Manual U12688EJ4V0UM00 230 MEMO ...
Страница 422: ...User s Manual U12688EJ4V0UM00 422 MEMO ...