SMCXXXAF Datasheet, PDF (40/82 Pages) Numonyx B.V – 32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte and 512 Mbyte 3.3 V / 5 V supply CompactFlash™ card

Software interface
SMCxxxAF
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.
Table 36. Memory mapped decoding
–REG A10 A9 to A4 A3 A2 A1 A0 Offset
–OE=0
1
0
X
0 0 0 0 0h
Even Data register
1
0
X
0 0 0 1 1h
Error register
1
0
X
0 0 1 0 2h
Sector Count register
1
0
X
0 0 1 1 3h Sector Number register
1
0
X
0 1 0 0 4h
Cylinder Low register
1
0
X
0 1 0 1 5h
Cylinder High register
1
0
X
0 1 1 0 6h
Select Card/Head
register
1
0
X
0 1 1 1 7h
Status register
1
0
X
1 0 0 0 8h Dup. Even Data register
1
0
X
1 0 0 1 9h Dup. Odd Data register
1
0
X
1 1 0 1 Dh
Dup. Error register
1
0
X
1 1 1 0 Eh Alternate Status register
1
0
X
1 1 1 1 Fh Drive Address register
1
1
X
X X X 0 8h
Even Data register
1
1
X
X X X 1 9h
Odd Data register
–WE=0
Even Data register
Feature register
Sector Count register
Sector Number register
Cylinder Low register
Cylinder High register
Select card/Head register
Command register
Dup. Even Data register
Dup. Odd Data register
Dup. Feature register
Device Control register
Reserved
Even Data register
Odd Data register
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