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Signal Name
– WAIT
(PC Card Memory Mode)
– WAIT
(PC Card I/O Mode)
IORDY
(True IDE Mode – Except
Ultra DMA Mode)
-DDMARDY
(True IDE Mode – Ultra
DMA Write Mode)
Dir.
O
Pin
42
Description
The – WAIT signal is driven low by the CompactFlash Storage
Card to signal the host to delay completion of a memory or I/O
cycle that is in progress.
This signal is the same as the PC Card Memory Mode signal.
In True IDE Mode, except in Ultra DMA modes, this output
signal may be used as IORDY.
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,
DSTROBE
(True IDE Mode – Ultra
DMA Read Mode)
– WE
(PC Card Memory Mode)
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 Storage
when the card is configured in the memory interface mode. It is
– WE
(PC Card I/O Mode)
– WE
(True IDE Mode)
WP
(PC Card Memory Mode)
I
36
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 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 Storage Card
– IOIS16
(PC Card I/O Mode)
O
24
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.
5.2 Electrical Specification
Table 13 defines the DC Characteristics for the CompactFlash Memory Card. Unless otherwise stated, conditions are:
Vcc = 5V ± 10%
Vcc = 3.3V ± 10%
0 °C to +85 °C
Table 13 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 14 shows the Input Leakage Current, Table 15 the Input Characteristics, Table 16 the Output Drive Type and
Table 13: Absolute Maximum Conditions
Parameter
Input Power
Voltage on any pin except VCC with respect to GND
Symbol
VCC
V
Conditions
-0.3V to 6.5V
? -0.5V to VCC +0.5V
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.20
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-320_data_sheet_CF-HxBO_Rev120.doc
Page 16 of 101
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