Card Configuration - SanDisk CompactFlash Extreme III Product Manual

Interface Description
The PIO data transfer parameters are defined in Table 3-16.
: SanDisk CompactFlash Memory cards do not assert an -IORDY
NOTE
signal.
Table 3-16
PIO Timing Parameters
Cycle time (min.)
a
t
0
Address valid to IORD-/IOWR- setup
t
1
(min.)
IORD-/IOWR- pulse width 16-bit (min.)
a
t
2
IORD-/IOWR- recovery time (min.)
t
2ia
IOWR- data setup (min.)
t
3
IOWR- data hold (min.)
t
4
IORD- data setup (min.)
t
5
IORD- data hold (min.)
t
6
IORD- data tri-state (max.)
b
t
6z
IORD-/IOWR- to address valid hold
t
9
(min.)
a. t is the minimum total cycle time, t
0
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 , t , and t
0 2
and t
equal to or greater than the value reported in the devices IDENTIFY DEVICE data. A device imple ­
mentation shall support any legal host implementation.
b. 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).
3.4

Card Configuration

SanDisk CompactFlash Memory cards are identified by appropriate information in the Card
Information Structure (CIS). The configuration registers are used to coordinate the I/O spaces
and the interrupt level of cards that are located in the system.
02/07, Rev. 12.0
PIO Data Transfer to/from Device
is the minimum command active time, and t
2
shall be met. The minimum total cycle time requirements are greater than the sum of t
2i
. This means a host implementation may lengthen either or both t
2i
3-20
SanDisk CompactFlash Card OEM Product Manual
Mode 0 Mode 1 Mode 2
(ns) (ns) (ns)
600 383 240
70 50 30
165 125 100
--- --- ---
60 45 30
30 20 15
50 35 20
5 5 5
30 30 30
20 15 10
© 2007 SanDisk Corporation
Mode 3 Mode 4
(ns) (ns)
180 120
30 25
80 70
70 25
30 20
10 10
20 20
5 5
30 30
10 10
is the minimum
2i
2
or t to ensure that t is
2 2i 0