Product manual

Preliminary CompactFlash Memory Card Product Manual

1.7.5 Automatic Sleep Mode

A unique feature of the SanDisk CompactFlash

Memory Card (and other SanDisk products) is

automatic entrance and exit from sleep mode.

Upon completion of a command, the

CompactFlash 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. Note that the delay from

command completion to entering sleep mode can

be adjusted.

When the host is ready to access the CompactFlash

Memory Card and it is in sleep mode, any

command issued to the CompactFlash Card will

cause it 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 versus

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 20%. This means less than 4.0

volts for the 5.00 volt range and less than 2.70 volts

for the 3.30 volt range.