CompactFlash Memory Card Product Manual
SanDisk CompactFlash Memory Card Product Manual © 1998 SANDISK CORPORATION
27
Table 4-2 Signal Description (continued)
Signal Name
Dir.
Pin
Description
RESET
(PC Card Memory Mode)
I
41
When the pin is high, this signal resets the CompactFlash Card.
The card is Reset only at power up if this pin is left high or open
from power-up. The card is also reset when the Soft Reset bit in
the Card Configuration Option Register is set.
RESET
(PC Card I/O Mode)
This signal is the same as the PC Card Memory Mode signal.
-RESET
(True IDE Mode)
In the True IDE Mode this input pin is the active low hardware
reset from the host.
VCC
(PC Card Memory Mode)
--
13, 38
+5 V, +3.3 V power.
VCC
(PC Card I/O Mode)
This signal is the same for all modes.
VCC
(True IDE Mode)
This signal is the same for all modes.
-VS1
-VS2
(PC Card Memory Mode)
O
33
40
Voltage Sense Signals. -VS1 is grounded so that the
CompactFlash Card CIS can be read at 3.3 volts and -VS2 is
open and reserved by PCMCIA for a secondary voltage.
-VS1
-VS2
(PC Card I/O Mode)
This signal is the same for all modes.
-VS1
-VS2
(True IDE Mode)
This signal is the same for all modes.
-WAIT
(PC Card Memory Mode)
O
42
The -WAIT signal is driven low by the CompactFlash Card to
signal the host to delay completion of a memory or I/O cycle that
is in progress.
-WAIT
(PC Card I/O Mode)
This signal is the same as the PC Card Memory Mode signal.
IORDY
(True IDE Mode)
In True IDE Mode this output signal may be used as IORDY.
-WE
(PC Card Memory Mode)
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.
-WE
(PC Card I/O Mode)
In PC Card I/O Mode, this signal is used for writing the
configuration registers.
-WE
(True IDE Mode)
In True IDE Mode this input signal is not used and should be
connected to VCC by the host.
WP
(PC Card Memory Mode)
Write Protect
O
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.
-IOIS16
( PC Card I/O Mode)
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.
-IOCS16
(True IDE Mode)
In True IDE Mode this output signal is asserted low when this
device is expecting a word data transfer cycle.
