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CompactFlash Memory Card Interface Description
PIO Timing Parameters
t
Cycle time
0
t
Address valid to IORD-/IOWR- setup
1
t
IORD-/IOWR- pulse width 16-bit
2
t
IORD-/IOWR- recovery time
2i
t
IOWR- data setup
3
t
IOWR- data hold
4
t
IORD- data setup
5
t
IORD- data hold
6
t
IORD- data tri-state
6z
t
IORD-/IOWR- to address valid hold
9
1. t
is the minimum total cycle time, t
0
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
cycle time requirements are greater than the sum of t
or both t
or t
to ensure that t
2
2i
A device implementation shall support any legal host implementation.
2. This parameter specifies the time from the negation edge of /IORD to the time that the data bus is no longer
driven by the device (tri-state).
3. SanDisk CompactFlash Memory Cards do not assert an -IORDY signal.
3.4. Card Configuration
The CompactFlash Memory Cards are identified by appropriate information in the Card Information Structure (CIS).
The following configuration registers are used to coordinate the I/O spaces and the Interr upt level of cards that are
located in the system. In addition, these registers provide a method for accessing status information about the
CompactFlash Card that may be used to arbitrate between multiple interrupt sources on the same interrupt level or to
replace status information that appears on dedicated pins in memory cards that have alternate use in I/O cards.
3-18
Table 3-13. PIO Data Transfer To/From Device
Mode 0 ns
(min)
600
(min)
70
(min)
165
(min)
-
(min)
60
(min)
30
(min)
50
(min)
5
(max)
30
(min)
20
is the minimum command active time, and t
2
and t
2
is equal to or greater than the value reported in the devices IDENTIFY DEVICE data.
0
®
CompactFlash
Memory Card Product Manual, Rev. 10.0 © 2002 SANDISK CORPORATION
Mode 1 ns
Mode 2 ns
383
240
50
30
125
100
-
-
45
30
20
15
35
20
5
5
30
30
15
10
2i
t
, and t
shall be met. The minimum total
0,
2
2i
This means a host implementation may lengthen either
2i.
Mode 3 ns
Mode 4 ns
Note
180
120
30
25
80
70
70
25
30
20
10
10
20
20
5
5
30
30
10
10
is the minimum command
1
1
1
2
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