Fujitsu MCM3130AP Manual Do Utilizador
Host Interface
C156-E227-01EN
4-6
4.3 Interface Registers
4.3.1 I/O registers
This section provides the I/O register functions and mapping. Definitions of each
register vary depending on which ATA or ATAPI commands are used.
register vary depending on which ATA or ATAPI commands are used.
Table 4.3 I/O port functions and mapping
Address signal
Function
CS0-
CS1-
DA2
DA1
DA0
READ (DIOR-)
WRITE (DIOW-)
N
N
x
x
x
High impedance state
Ineffective
Control block register
N
A
0
x
x
High impedance state
Ineffective
N
A
1
0
x
High impedance state
Ineffective
N
A
1
1
0
Alternate Status
Device Control
N
A
1
1
1
Drive Address
Ineffective
Command block register
A
N
0
0
0
Data
A
N
0
0
1
Error
ATA Features (ATA)
ATAPI Features (ATAPI)
A
N
0
1
0
Sector Count (ATA)
ATAPI Interrupt Reason
(ATAPI)
Ineffective
A
N
0
1
1
Sector Number
A
N
1
0
0
Cylinder Low (ATA)
ATAPI Byte Count (bits 0-7) (ATAPI)
A
N
1
0
1
Cylinder High (ATA)
ATAPI Byte Count (bits8-15) (ATAPI)
A
N
1
1
0
Device/Head (ATA)
ATAPI Block Device Select (ATAPI)
A
N
1
1
1
ATAPI Status
ATA Command
A
A
x
x
x
Ineffective
Ineffective
The letter A indicates that the bit is asserted, N indicates that the bit is negated,
and X indicates that the bit is ignored.
and X indicates that the bit is ignored.