Fujitsu MCM3064AP Interface Registers, 4.3.1 I/O registers, 3 I/O port functions and mapping

Host Interface

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.

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		Ineffective
					(ATAPI)
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.

C156-E227-01EN 4-6