Interface Description SanDisk CompactFlash Card OEM Product Manual
The PIO data transfer parameters are defined in Table 3-16.
NOTE:SanDisk CompactFlash Memory cards do not assert an -IORDY
signal.
Table 3-16 PIO Data Transfer to/from Device
PIO Timing Parameters Mode 0
(ns) Mode 1
(ns) Mode 2
(ns) Mode 3
(ns) Mode 4
(ns)
t0
a Cycle time (min.) 600 383 240 180 120
t1 Address valid to IORD-/IOWR- setup
(min.) 70 50 30 30 25
t2
a IORD-/IOWR- pulse width 16-bit (min.) 165 125 100 80 70
t2ia IORD-/IOWR- recovery time (min.) --- --- --- 70 25
t3 IOWR- data setup (min.) 60 45 30 30 20
t4 IOWR- data hold (min.) 30 20 15 10 10
t5 IORD- data setup (min.) 50 35 20 20 20
t6 IORD- data hold (min.) 5 5 5 5 5
t6z
b IORD- data tri-state (max.) 30 30 30 30 30
t9 IORD-/IOWR- to address valid hold
(min.) 20 15 10 10 10
a. 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 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 3-20 © 2007 SanDisk Corporation