smc256af Numonyx, smc256af Datasheet - Page 40

• Manufacturer Part Number: smc256af
• Description: 32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte And 512 Mbyte 3.3 V / 5 V Supply Compactflash? Card
• Manufacturer: Numonyx

Software interface
Table 36.
40/82
–
REG
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
A10
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
Accesses to even addresses between 400h and 7FFh access register 8. Accesses to odd
addresses between 400h and 7FFh access register 9. This 1 Kbyte memory window to the
data register is provided so that hosts can perform memory-to-memory block moves to the
data register when the register lies in memory space. Some hosts, such as the X86
processors, must increment both the source and destination addresses when executing the
memory-to-memory block move instruction. Some PCMCIA socket adapters also have an
embedded auto incrementing address logic.
A word access to address at offset 8 will provide even data on the least significant byte of
the data bus, along with odd data at offset 9 on the most significant byte of the data bus.
Memory mapped decoding
A9 to A4 A3
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
1
1
1
1
1
A2
X
X
0
0
0
0
1
1
1
1
0
0
1
1
1
A1
X
X
0
0
1
1
0
0
1
1
0
0
0
1
1
A0
0
1
0
1
0
1
0
1
0
1
1
0
1
0
1
Offset
Dh
Eh
Fh
0h
1h
2h
3h
4h
5h
6h
7h
8h
9h
8h
9h
Alternate Status register
Dup. Even Data register
Sector Number register
Dup. Odd Data register
Drive Address register
Cylinder High register
Sector Count register
Cylinder Low register
Even Data register
Dup. Error register
Even Data register
Select Card/Head
Odd Data register
Status register
Error register
register
–
OE=0
Select card/Head register
Dup. Even Data register
Sector Number register
Dup. Odd Data register
Device Control register
Cylinder High register
Sector Count register
Cylinder Low register
Dup. Feature register
Even Data register
Even Data register
Command register
Odd Data register
Feature register
Reserved
–
WE=0
SMCxxxAF