Ultra Dma Timings - IBM DBCA-204860 - Travelstar 4.8 GB Hard Drive Specifications

6.5.3 Ultra DMA Timings

The Ultra D M A timing meets Mode 0, 1 and 2 of the Ultra DMA/33 -- a Proposal for a New Protocol in
ATA/ATAPI-4 (X3T13/D96153 Revision 1)
6.5.3.1 Initiating Read DMA
D M A R Q
< T u i
D M A C K
< T a c k > < T e n v >
S T O P
< T a c k > < T e n v >
H D M A R D Y
T z r d y >
D S T R O B E
D D ( 1 5 : 0 0 ) X X X X X X X X X X X X X X X
H o s t d r i v e s D D
P A R A M E T E R D E S C R I P T I O N
T u i U n l i m i t e d i n t e r l o c k t i m e
T a c k S e t u p t i m e b e f o r e
T e n v E n v e l o p e t i m e
T z r d y W a i t t i m e b e f o r e d r i v i n g D S T R O B E
T f s F i r s t s t r o b e t i m e
T c y c C y c l e T i m e
T 2 c y c 2 C y c l e t i m e
T a z O u t p u t r e l e a s e t i m e
T z a d O u t p u t e n a b l e t i m e
T d v s D a t a s e t u p t i m e ( a t d e v i c e s i d e )
T d v h D a t a H o l d t i m e
Figure 28. Ultra D M A cycle timings (Initiating Read)
42
O E M Specifications of DBCA-2xxxxx 2.5 inch H D D
>
< < T f s
T a z < > < > T z a d
X X X
> <
D M A C K a s s e r t i o n
( a t d e v i c e s i d e )
< T 2 c y c
> < T c y c > <
> T d v s T d v h <
R D D a t a X X X R D D a t a
D e v i c e d r i v e s D D
M O D E 0 M O D E 1
M I N M A X M I N
0 0
2 0 2 0
2 0 7 0 2 0
0 0
0 2 3 0 0
1 1 4 7 5
2 3 5 1 5 6
1 0
0 0
7 0 4 8
6 6
>
T c y c >
X X X R D D a t a
[ n s e c ]
M O D E 2
M A X M I N M A X
0
2 0
7 0 2 0 7 0
0
2 0 0 0 1 7 0
5 5
1 1 7
1 0 1 0
0
3 4
6