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DISK DRIVE OPERATION
SpinPoint V40 Product Manual
93
Table 6-17 PIO data transfer to/from device
PIO timing parameters Mode 0
ns
Mode 1
ns
Mode 2
ns
Mode 3
ns
Mode 4
ns
Note
t
0
Cycle time (min) 600 383 240 180 120 1,4
t
1
Address valid to DIOR-/DIOW- setup (min) 70 50 30 30 25
t
2
DIOR-/DIOW- 16-bit
(min)
165
125
100
80
70
1
t
2i
DIOR-/DIOW- recovery time (min) - - - 70 25 1
t
3
DIOW- data setup (min) 60 45 30 30 20
t
4
DIOW- data hold (min) 30 20 15 10 10
t
5
DIOR- data setup (min) 50 35 20 20 20
t
6
DIOR- data hold (min) 5 5 5 5 5
t
6Z
DIOR- data tri-state (max) 30 30 30 30 30 2
t
9
DIOR-/DIOW- to address valid hold (min) 20 15 10 10 10
t
RD
Read Data Valid to IORDY active
(if IORDY initially low after t
A
)
(min) 0 0 0 0 0
t
A
IORDY Setup time 35 35 35 35 35 3
t
B
IORDY Pulse Width (max) 1250 1250 1250 1250 1250
t
C
IORDY assertion to release (max) 5 5 5 5 5
NOTES −
1 t
0
is the minimum total cycle time, t
2
is the minimum command active time, and t
2i
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 t
0
, t
2
, and t
2i
shall be met. The minimum total cycle time
requirements are greater than the sum of t
2
and t
2i
. This means a host implementation may lengthen either or both t
2
or
t
2i
to ensure that t
0
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 t
A
after the activation of DIOR- or DIOW-, then t
5
shall be met and t
RD
is not applicable. If the device is
driving IORDY negated at the time t
A
after the activation of DIOR- or DIOW-, then t
RD
shall be met and t
5
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.