UPD30181 Datasheet, PDF (346/444 Pages) NEC – 64-/32-Bit Microprocessor

CHAPTER 17 COMPACTFLASH CONTROLLER (ECU)
17.4.17 MEMOFFLnREG (Index: 0x14, 0x1C, 0x24, 0x2C, 0x34)
Remark
n = 0 to 4
MEMOFFL0REG (0x14): for Window 0
MEMOFFL1REG (0x1C): for Window 1
MEMOFFL2REG (0x24): for Window 2
MEMOFFL3REG (0x2C): for Window 3
MEMOFFL4REG (0x34): for Window 4
Bit
Name
R/W
Reset
7
OFFSETA
19
R/W
0
6
OFFSETA
18
R/W
0
5
OFFSETA
17
R/W
0
4
OFFSETA
16
R/W
0
3
OFFSETA
15
R/W
0
2
OFFSETA
14
R/W
0
1
OFFSETA
13
R/W
0
0
OFFSETA
12
R/W
0
Bit
7 to 0
Name
OFFSETA(19:12)
Function
Card memory offset address bits 19 to 12
This register is defined to maintain compatibility with the ExCA. Settings in this register have no meaning in the
VR4181.
17.4.18 MEMOFFHnREG (Index: 0x15, 0x1D, 0x25, 0x2D, 0x35)
Remark
n = 0 to 4
MEMOFFH0REG (0x15): for Window 0
MEMOFFH1REG (0x1D): for Window 1
MEMOFFH2REG (0x25): for Window 2
MEMOFFH3REG (0x2D): for Window 3
MEMOFFH4REG (0x35): for Window 4
Bit
Name
R/W
Reset
7
6
5
4
3
2
1
0
WP
REG
OFFSETA OFFSETA OFFSETA OFFSETA OFFSETA OFFSETA
25
24
23
22
21
20
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Bit
Name
7
WP
6
REG
5 to 0
OFFSETA(25:20)
Function
Write protect to the card through a memory window
0 : Write operation allowed
1 : Write operation prohibited
REG# (CF_REG#) signal active of the CompactFlash. This bit is used to set
which memory is to be used on accesses to the CompactFlash card.
0 : Common memory
1 : Attribute memory
Card memory offset address bits 25 to 20.
Remark This is defined to maintain compatibility with the ExCA. Settings in
these bits have no meaning in the VR4181.
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User’s Manual U14272EJ3V0UM