Fujitsu MPD3XXXAT manual 3 I/O registers

Models: MPD3XXXAT

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Table 5.3 I/O registers

CS0–

CS1–

DA2

DA1

DA0

I/O registers

Host I/O

 

 

Read operation

Write operation

address

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Command block registers

 

 

 

 

 

 

 

 

 

 

 

 

 

1

0

0

0

0

Data

Data

X'1F0'

 

 

 

 

 

 

 

 

1

0

0

0

1

Error Register

Features

X'1F1'

 

 

 

 

 

 

 

 

1

0

0

1

0

Sector Count

Sector Count

X'1F2'

 

 

 

 

 

 

 

 

1

0

0

1

1

Sector Number

Sector Number

X'1F3'

 

 

 

 

 

 

 

 

1

0

1

0

0

Cylinder Low

Cylinder Low

X'1F4'

 

 

 

 

 

 

 

 

1

0

1

0

1

Cylinder High

Cylinder High

X'1F5'

 

 

 

 

 

 

 

 

1

0

1

1

0

Device/Head

Device/Head

X'1F6'

 

 

 

 

 

 

 

 

1

0

1

1

1

Status

Command

X'1F7'

 

 

 

 

 

 

 

 

1

1

X

X

X

(Invalid)

(Invalid)

 

 

 

 

 

 

 

 

Control block registers

 

 

 

 

 

 

 

 

 

 

 

 

 

0

1

1

1

0

Alternate Status

Device Control

X'3F6'

 

 

 

 

 

 

 

 

0

1

1

1

1

X'3F7'

 

 

 

 

 

 

 

 

Notes:

1.The Data register for read or write operation can be accessed by 16 bit data bus (DATA0 to DATA15).

2.The registers for read or write operation other than the Data registers can be accessed by 8 bit data bus (DATA0 to DATA7).

3.When reading the Drive Address register, bit 7 is high-impedance state.

4.The LBA mode is specified, the Device/Head, Cylinder High, Cylinder Low, and Sector Number registers indicate LBA bits 27 to 24, 23 to 16, 15 to 8, and 7 to 0.

C141-E069-02EN

5 - 7

Page 74
Image 74
Fujitsu MPD3XXXAT manual 3 I/O registers