Addressing Of Drive Registers - IBM DTNA-22160 - Travelstar 2.1 GB Hard Drive Specifications

6.9 Addressing of drive Registers

The host addresses the drive through a set of registers called a Task File. These registers are mapped into
the host's I/O space. Two chip select lines (-HCS0 and -HCS1) and three address lines (HA00-02) are used
to select one of these registers, while a -HIOR or -HIOW is provided at the specified time.
The -HCS0 is used to address Command Block registers. while the -HCS1 is used to address Control Block
registers.
The following table shows the standard I/O address range for IBM PC-AT machines.
A d d r . C S 0 C S 1 H A 2 H A 1 H A 0
1 F 0 0 1 0
1 F 1 0 1 0
1 F 2 0 1 0
1 F 3 0 1 0
1 F 4 0 1 1
1 F 5 0 1 1
1 F 6 0 1 1
1 F 7 0 1 1
3 F 6 1 0 1
3 F 7 1 0 1
Figure 27. Register Address
Note: "Addr." field is shown just as an example.
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O E M Specifications of DTNA-2xxxx 2.5 inch H D D
H I O R = 0 ( R e a d )
C o m m a n d B l o c k R e g i s t e r s
0 0 D a t a R e g .
0 1 E r r o r R e g .
1 0 S e c t o r c o u n t R e g .
1 1 S e c t o r n u m b e r R e g .
0 0 C y l i n d e r l o w R e g .
0 1 C y l i n d e r h i g h R e g .
1 0 D r i v e / H e a d R e g .
1 1 S t a t u s R e g .
C o n t r o l B l o c k R e g i s t e r s
1 0 A l t . S t a t u s R e g .
1 1 D r i v e a d d r e s s R e g .
H I O W = 0 ( W r i t e )
D a t a R e g .
F e a t u r e s R e g .
S e c t o r c o u n t R e g .
S e c t o r n u m b e r R e g .
C y l i n d e r l o w R e g .
C y l i n d e r h i g h R e g .
D r i v e / H e a d R e g .
C o m m a n d R e g .
D e v i c e c o n t r o l R e g