DISK DRIVE OPERATION

Table 6-17PIO data transfer to/from device

 

PIO timing parameters

 

Mode 0

Mode 1

Mode 2

Mode 3

Mode 4

Note

 

 

 

 

ns

ns

ns

ns

ns

 

t0

Cycle time

 

(min)

600

383

240

180

120

1,4

t1

Address valid to DIOR-/DIOW- setup

(min)

70

50

30

30

25

 

t2

DIOR-/DIOW-

16-bit

(min)

165

125

100

80

70

1

 

 

 

 

 

 

 

 

 

t2i

DIOR-/DIOW- recovery time

(min)

-

-

-

70

25

1

t3

DIOW- data setup

 

(min)

60

45

30

30

20

 

t4

DIOW- data hold

 

(min)

30

20

15

10

10

 

t5

DIOR- data setup

 

(min)

50

35

20

20

20

 

t6

DIOR- data hold

 

(min)

5

5

5

5

5

 

t6Z

DIOR- data tri-state

 

(max)

30

30

30

30

30

2

t9

DIOR-/DIOW- to address valid hold

(min)

20

15

10

10

10

 

tRD

Read Data Valid to IORDY active

(min)

0

0

0

0

0

 

 

(if IORDY initially low after tA)

 

 

 

 

 

 

 

tA

IORDY Setup time

 

 

35

35

35

35

35

3

tB

IORDY Pulse Width

 

(max)

1250

1250

1250

1250

1250

 

tC

IORDY assertion to release

(max)

5

5

5

5

5

 

NOTES

1 t0 is the minimum total cycle time, t2 is the minimum command active time, and t2i is the minimum command recovery time or command inactive time. The actual cycle time equals the sum of the actual command active time and the actual command inactive time. The three timing requirements of t0, t2, and t2i shall be met. The minimum total cycle time requirements are greater than the sum of t2 and t2i. This means a host implementation may lengthen either or both t2 or t2i to ensure that t0 is equal to or greater than the value reported in the devices IDENTIFY DEVICE data. A device implementation shall support any legal host implementation.

2 This parameter specifies the time from the negation edge of DIOR- to the time that the data bus is no longer driven by the device (tri-state).

3The delay from the activation of DIOR- or DIOW- until the state of IORDY is first sampled. If IORDY is inactive then the host shall wait until IORDY is active before the PIO cycle is completed. If the device is not driving IORDY negated at the tA after the activation of DIOR- or DIOW-, then t5 shall be met and tRD is not applicable. If the device is driving IORDY negated at the time tA after the activation of DIOR- or DIOW-, then tRD shall be met and t5 is not applicable.

4 Mode may be selected at the highest mode for the device if CS(1:0) and AD(2:0) do not change between read or write cycles or selected at the highest mode supported by the slowest device if CS(1:0) or AD(2:0) do change between read or write cycles.

SpinPoint V40 Product Manual

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Samsung 3.5 hard disk drives, spinpoint v40 manual Dior-/Diow