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Requirements for using extended speed (PIO 5, 6/ MDMA 3, 4)
(CompactFlash Specification 3.0; section 4.3.7)
The CF Advanced Timing modes include PCMCIA I/O and Memory modes that are 100ns or faster and True
IDE PIO Modes 5,6 and Multiword DMA Modes 3,4.
When operating in CF Advanced timing modes, the host shall conform to the following requirements:
1.
2.
Only one CF device shall be attached to the CF Bus.
The host shall not present a load of more than 40pF to the device for all signals, including any cabling.
3. The maximum cable length is 0.05 m (2 in). The cable length is measured from the card connector to the
host controller. 0.46 m (18 in) cables are not supported.
4. The – WAIT and IORDY signals shall be ignored by the host.
Devices supporting CF Advanced timing modes shall also support slower timing modes, to ensure operability with
systems that do not support CF Advanced timing modes.
Ultra DMA Electrical Requirements
(CompactFlash Specification 3.0; section 4.3.8)
Operation in Ultra DMA mode requires careful attention to cabling, printed circuit board (PCB) trace routing and
termination for reliable operation. These requirements are described in the following sections.
Host and Card signal capacitance limits for Ultra DMA operation
The host interface signal capacitance at the host connector shall be a maximum of 25pF for each signal as
measured at 1 MHz.
The card interface signal capacitance at the card connector shall be a maximum of 20pF for each signal as
measured at 1 MHz.
Series termination required for Ultra DMA operation
Series termination resistors are required at both the host and the card for operation in any of the Ultra DMA
modes. The CF specification describes typical values for series termination at the host and the device.
4.2 Environmental Specifications
4.2.1 Recommended Operating Conditions
Table 4: CF Card Recommended Operating Conditions
Parameter
Commercial Operating Temperature
Industrial Operating Temperature
Power Supply VCC Voltage (5V)
Power Supply VCC Voltage (3.3V)
Table 5: Current consumption (1)
Value
0°C to 70°C
-40°C to 85°C
4.5V to 5.5V – 5.0V ±10%
2.97V to 3.63V – 3.3V ±10%
Current Consumption (type)
Read (MDMA2/UDMA4/max)
Write (MDMA2/UDMA4/max)
Sleep/Idle Mode (typ/max)
3.3V
60 / 90 / 140
60 / 90 / 140
0.5 / 1.5
5V
100 / 140 / 180
95 / 130 / 160
2.0 / 5.0
Unit
mA
1.
All values are typical at 25° C and nominal supply voltage and refer to 8Gbyte CompactFlash Card.
Max values are for 32GB cards in UDMA4 mode in IDE mode. Cards with smaller capacity have smaller current.
The card goes to Sleep/idle mode 20ms (default) after last host command.
The sleep current at 5V depends on the signal level at the CF-Bus
4.2.2 Recommended Storage Conditions
Table 6: CF Card Recommended Storage Conditions
Parameter
Storage Temperature
Value
-50°C to 100°C
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 8 of 101
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