Instruction Manual

Signal Name Dir. Description
-VS1
-VS2
(CF Card Memory
Mode)
O 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 CF Card for a secondary voltage.
-VS1
-VS2
(CF 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
(CF Card Memory
Mode)
O The –WAIT signal is driven by the CompactFlash Card to signal to the host to delay
completion of the memory cycle in progress.
-WAIT
(CF Card I/O Mode)
The –WAIT signal is driven by the CompactFlash Card to signal to the host to delay
completion of the I/O cycle in progress.
-IORDY
(True IDE Mode, UDMA
not active)
-DDMARDY
(TrueIDE Mode, UDMA
write active)
DSTROBE
(TrueIDE Mode, UDMA
read active)
In TrueIDE Mode, when UDMA protocol is not active, this signal is driven by the device to
extend the I/O cycle in progress.
In TrueIDE Mode, when UDMA write protocol is active, this signal is asserted by the device to
indicate that it is ready to receive a data out burst.
In TrueIDE Mode, when UDMA read protocol is active, this signal is the data strobe sent by the
device to the host. The host latches data on both the rising and falling edges of this signal.
-WE
(CF Card Memory
Mode)
I 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
(CF Card I/O Mode)
In CF Card I/O Mode, this signal is used for writing the configuration registers.
Reserved
(True IDE Mode)
In True IDE Mode this input signal is not used and should be connected to VCC by the host.
WP
(CF Card Memory
Mode)
Write Protect
O 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
(CF 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.
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Parameter Symbol MIN MAX Units
Storage Temperature Ts -65 +150
o
C
Operating Temperature T
A
-45 +90
o
C
Vcc with respect to GND Vcc -0.3 6.5 V
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Cactus Technologies Limited Industrial Grade Compact Flash -3XX/-3XX-P1/-3XX-WP1 Series Product Manual v2.3 14