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Signal Name
-DDMARDY
(True IDE Mode – Ultra
DMA Write Mode)
DSTROBE
(True IDE Mode – Ultra
DMA Read Mode)
– WE
(PC Card Memory Mode)
– WE
(PC Card I/O Mode)
– WE
(True IDE Mode)
WP
(PC Card Memory Mode)
Dir.
I
Pin
36
Description
In True IDE Mode, when Ultra DMA mode DMA Write is active, this signal is
asserted by the host to indicate that the device is read to receive Ultra DMA
data-in bursts. The device may negate – DDMARDY to pause an Ultra DMA
transfer.
In True IDE Mode, when Ultra DMA mode DMA Write is active, this signal is the
data out strobe generated by the device. Both the rising and falling edge of
DSTROBE cause data to be latched by the host. The device may stop generating
DSTROBE edges to pause an Ultra DMA data-out burst.
This is a signal driven by the host and used for strobing memory write data to
the registers of the CompactFlash TM Storage 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.
Memory Mode – The CompactFlash TM Storage 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 TM Storage 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
– IOIS16
(PC Card I/O Mode)
O
24
at the addressed port.
In PC-Card mode, the IOIS16 signal does not work correctly. If a host uses this
signal, this may result in 16 bit accesses being changed to two 8 bit accesses.
Depending on the address, this may fail. A simple test will show the C-400
compatibility to a certain host. If the C-400 cards can be recognized (Identify
Device and MBR data is read out successfully), then this PC card issue will likely
not affect the operation in this host. (1)
– IOCS16
(True IDE Mode)
In True IDE Mode this output signal is asserted low when this device is
expecting a word data transfer cycle.
1)
If you have host-card incompatibilities please contact Swissbit.
5.2 Electrical Specification
Table 12 defines the DC Characteristics for the CompactFlash TM Memory Card. Unless otherwise stated, conditions
are:
Vcc = 5V ± 10%
Vcc = 3.3V ± 5%
0 °C to +85 °C
The card interface is driven with 3.3V. The input pins are 5V tolerant.
The High-Speed IDE lines are terminated with serial resistors as specified in the ATA specification to improve the
signal quality.
Table 12 shows that the Card operates correctly in both the voltage ranges and that the current requirements must
not exceed the maximum limit shown.
The current is measured by connecting an amp meter in series with the Vcc supply. The meter should be set to the
2A scale range, and have a fast current probe with an RC filter with a time constant of 0.1ms. Current
measurements are taken while looping on a data transfer command with a sector count of 128. Current
consumption values for both read and write commands are not to exceed the Maximum Average RMS Current
Table 13 shows the Input Leakage Current, Table 14 the Input Characteristics, Table 15 the Output Drive Type and
Table 12: Absolute Maximum Conditions
Parameter
Input Power
Voltage on any pin except VCC with respect to GND
Table 13: Input Leakage current (1)
Symbol
VCC
V
Conditions
-0.3V to 6.5V
-0.5V to 6.5V
Type
IxZ
IxU
IxD
Parameter
Input Leakage Current
(if not pulled up or down)
Pull Up Resistor
Pull Down Resistor
Symbol
IL
RPU1
RPD1
Conditions
V IH =Vcc
V IL = GND
Vcc = 5.0V
Vcc = 5.0V
Min.
-10
50
50
Typ.
Max.
10
500
500
Units
μA
kOhm
kOhm
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-440_data_sheet_CF-HxBU_Rev100.doc
Page 16 of 102
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