SanDisk CompactFlash Card OEM Product Manual Interface Description
Table 3-14 contains the specification information related to the I/O Write Timing Diagram.
Table 3-14 I/O Write Timing Specification
Item
Symbol
IEEE Symbol Min. (ns) Max. (ns)
Data Setup before -IOWR t
su
(IOWR) t
DVIWL
60 ---
Data Hold following -IOWR t
h
(IOWR) t
WHDX
30 ---
-IOWR Width Time t
w
(IOWR) tl
WLIWH
165 ---
Address Setup before -IOWR t
su
A(IOWR) t
AVIWL
70 ---
Address Hold following -IOWR t
h
A(IOWR) tl
WHAX
20 ---
-CE Setup before -IOWR t
su
CE(IOWR) t
ELIWL
5 ---
-CE Hold following -IOWR t
h
CE(IOWR) tl
WHEH
20 ---
-REG Setup before -IOWR t
su
REG(IOWR) t
RGLIWL
5 ---
-REG Hold following -IOWR t
h
REG(IOWR) tl
WHRGH
0 ---
-IOIS16 Delay falling from Address t
df
IOIS16(ADR) t
AVISL
---
35
a
-IOIS16 Delay rising from -IORD t
dr
-IOIS16(ADR) t
AVISH
--- 35
-IOIS16 Delay falling from Address t
df
IOIS16(ADR) t
AVISL
--- 35
-IOIS16 Delay rising from Address t
dr
IOIS16(ADR) t
AVISH
--- 35
a. The maximum load on -IOIS16 is 1 LSTTL with 50 pF total load.
3.3.10 True IDE Mode
The following sections provide valuable information for the True IDE mode.
De-skewing. The host will provide cable de-skewing for all signals originating from the
device. The device will provide cable de-skewing for all signals originating at the host.
All timing values and diagrams are shown and measured at the connector of the selected
device.
Transfer Timing. The minimum cycle time supported by devices in PIO Mode 3, 4 and
Multiword DMA Mode 1, 2 respectively will always be greater than or equal to the minimum
cycle time defined by the associated mode (e.g., a device supporting PIO Mode 4 timing will
not report a value less than 120 ns. The minimum cycle time defined for PIO mode 4 timings).
• Register Transfers
Figure 3-7 defines the relationships between the interface signals for register transfers.
For PIO Modes 3 and above, the minimum value of t
0
is specified by Word 68 in the
IDENTIFY DEVICE parameter list. Table 3-15 defines the minimum value that will be
placed in Word 68.
In Figure 3-7, all signals shown with the asserted condition facing the top of the page. The
negated condition is shown toward the bottom of the page relative to the asserted condi-
tion.
NOTE: SanDisk CompactFlash Memory cards do not assert an -IORDY
signal.
© 2007 SanDisk Corporation 3-17 Rev. 12.0, 02/07
