SanDisk SDCFH-004G Product Manual - Page 11

Automatic Sleep Mode, Dynamic Adjustment of Performance vs. Power Consumption, Power Supply

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SanDisk CompactFlash Card OEM Product Manual Introduction 1.7.5 Automatic Sleep Mode A unique feature of the SanDisk CompactFlash Memory Card is automatic entrance and exit from sleep mode. Upon completion of a command, the card will enter sleep mode to conserve power if no further commands are received within 5 msec. The host does not have to take any action for this to occur. In most systems, the CompactFlash Memory Card is in sleep mode except when the host is accessing it, thus conserving power. The delay from command completion to entering sleep mode is adjustable. When the host is ready to access the card and is in sleep mode, any command issued to it will cause the card to exit sleep and respond. The host does not have to follow the ATA protocol of issuing a reset first. It may do this if desired, but it is not needed. By not issuing the reset, performance is improved through the reduction of overhead but this must be done only for the SanDisk products as other ATA products may not support this feature. 1.7.6 Dynamic Adjustment of Performance vs. Power Consumption This feature is no longer supported. This command will be treated as a NOP (No Operation) to guarantee backward compatibility. 1.7.7 Power Supply Requirements This is a dual voltage product, which means it will operate at a voltage range of 3.30 volts ± 5% or 5.00 volts ± 10%. Per the PCMCIA specification Section 2.1.1, the host system must apply 0 volts in order to change a voltage range. This same procedure of providing 0 volts to the card is required if the host system applies an input voltage outside the desired voltage by more than 15%. This means less than 4.25 volts for the 5.00-volt range and less than 2.75 volts for the 3.30 volt range. © 2007 SanDisk Corporation 1-5 Rev. 12.0, 02/07

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SanDisk CompactFlash Card OEM Product Manual
Introduction
1.7.5
Automatic Sleep Mode
A unique feature of the SanDisk CompactFlash Memory Card is automatic entrance and exit
from sleep mode. Upon completion of a command, the card will enter sleep mode to conserve
power if no further commands are received within 5 msec. The host does not have to take any
action for this to occur. In most systems, the CompactFlash Memory Card is in sleep mode
except when the host is accessing it, thus conserving power. The delay from command
completion to entering sleep mode is adjustable.
When the host is ready to access the card and is in sleep mode, any command issued to it will
cause the card to exit sleep and respond. The host does not have to follow the ATA protocol of
issuing a reset first. It may do this if desired, but it is not needed. By not issuing the reset,
performance is improved through the reduction of overhead but this must be done only for the
SanDisk products as other ATA products may not support this feature.
1.7.6
Dynamic Adjustment of Performance vs. Power Consumption
This feature is no longer supported. This command will be treated as a NOP (No Operation) to
guarantee backward compatibility.
1.7.7
Power Supply Requirements
This is a dual voltage product, which means it will operate at a voltage range of 3.30 volts ±
5% or 5.00 volts ± 10%. Per the PCMCIA specification Section 2.1.1, the host system must
apply 0 volts in order to change a voltage range. This same procedure of providing 0 volts to
the card is required if the host system applies an input voltage outside the desired voltage by
more than 15%. This means less than 4.25 volts for the 5.00-volt range and less than 2.75 volts
for the 3.30 volt range.
© 2007 SanDisk Corporation
1-5
Rev. 12.0, 02/07