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CompactFlash Memory Card Interface Description
Signal Name
Dir.
-VS1
O
-VS2
(PC Card Memory Mode)
-VS1
-VS2
(PC Card I/O Mode)
-VS1
-VS2
(True IDE Mode)
-WAIT
O
(PC Card Memory Mode)
-WAIT
(PC Card I/O Mode)
-IORDY
(True IDE Mode)
-WE
(PC Card Memory Mode)
-WE
(PC Card I/O Mode)
-WE
(True IDE Mode)
WP
O
(PC Card Memory Mode)
Write Protect
-IOIS16
( PC Card I/O Mode)
-IOCS16
(True IDE Mode)
3.3. Electrical Specification
The following table defines all D.C. Characteristics for the CompactFlash Memory Card Series.
Unless otherwise stated, conditions are:
Vcc = 5V ±10%
Vcc = 3.3V ± 5%
Ta = 0°C to 60°C
Absolute Maximum conditions are:
Vcc = -0.3V min. to 7.0V max.
V* = -0.5V min. to Vcc + 0.5V max.
* Voltage on any pin except Vcc with respect to GND.
3-6
Pin
33
Voltage Sense Signals. -VS1 is grounded so that the CompactFlash Card CIS can be
40
read at 3.3 volts and -VS2 is open and reserved by PCMCIA for a secondary voltage.
This signal is the same for all modes.
This signal is the same for all modes.
42
SanDisk CompactFlash Memory Cards do not assert the -WAIT signal.
SanDisk CompactFlash Memory Cards do not assert the -WAIT signal.
SanDisk CompactFlash Memory Cards do not assert an -IORDY signal.
I
36
This is a signal driven by the host and used for strobing memory write data to the
registers of the CompactFlash Card when the card is configured in the memory
interface mode. It is also used for writing the configuration registers.
In PC Card I/O Mode, this signal is used for writing the configuration registers.
In True IDE Mode this input signal is not used and should be connected to VCC by the
host.
24
Memory Mode—The CompactFlash Card does not have a write protect switch. This
signal is held low after the completion of the reset initialization sequence.
I/O Operation—When the CompactFlash Card is configured for I/O Operation, Pin 24
is used for the -I/O Selected is 16 Bit Port (-IOIS16) function. A Low signal indicates
that a 16 bit or odd byte only operation can be performed at the addressed port.
In True IDE Mode this output signal is asserted low when this device is expecting a
word data transfer cycle.
®
CompactFlash
Memory Card Product Manual, Rev. 10.0 © 2002 SANDISK CORPORATION
Description
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